Tips for Buying Used Engines

Buying used engines can be tricky and tedious but the process is simplified with these 8 invaluable tips.

1. Know the specifications of the engine being sought and accept nothing less. Accepting anything less may result in the engine being an incorrect fit for your vehicle.
2. Do your research. Find out all you need to know about used engines before you purchase any. This is a very easy way for dealers to scam inexperienced buyers.
3. Before you buy an engine do a thorough history or VIN check on it. These are available anywhere used engines are sold in abundance and are extremely necessary for the customer to know exactly what they are getting.
4. Search for an engine that has the lowest mileage possible. Engines with many miles do not perform at their best and can turn out to be money pits in terms of maintenance. Once the VIN check comes back in your favor a low mileage engine with fairly good quality is your best bet.
5. Ensure that the engine comes with a warranty. A minimum 6 month warranty is placed on many used engines and that should suffice except some used engines can be very expensive and six months is not a wide enough time frame to properly assess their performance. Though the warranty is good it is also recommended that the buyer opt to upgrade it to at least one year. This gives you somewhat of a cushion of protection as many used engines can be costly.
6. Do not buy engines from one off sellers. It is hard to get an accurate history of the engine and you truly do not know what you are getting.
7. Search through your local classified for salvage yard sales but only go to the sales if they have the specific engine you are looking for. This will save you a lot of time.
8. Buy online. Buying online offers a wider variety and it gives the customer as much time as they need to make a purchasing decision. Ensure that you buy from reputable and recommended sites. Ask friends who have already bought engines online to help you. Remember some deals are in fact too good to be true.

Navigating the arena of used engines can be tricky. It is very easy to be scammed if you do not know what to look for or the right questions to ask. Ensure that your research is thoroughly done and follow the aforementioned tips so that you can get the best possible outcome.

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Stress Analysis of a Natural Gas Engine Cylinder Head

1. Introduction

In the past, optimization of engine components such as cylinder heads was based on building a series of physical prototypes, and performing a series of different experiments and tests [1]. Unfortunately, the traditional process for designing and developing was time-consuming and difficult to build physical prototypes during the early stages of the design. The construction and testing of many prototypes is often required to meet a stringent design requirement [2]. This can turn into an expensive process and delay the entire design and development cycle.  Although building and testing of the engine component prototypes can yield accurate design, detailed information is not available and the logic behind a specific design cannot be verified. As a result, engineers attain little and general information from each test [3]. Therefore, the finite element analysis (FEA) methodology is being used and becoming a systematic methodology in the early stages of engine design to save the time and cost of manufacturing process. Finite element analysis methodology (FEA) assist engineers to predict the best method for heat removal prior to the first prototype is built by calculating the temperature and stress distribution of each component. Therefore, finite element analysis (FEA) is considered as one of the most powerful computer-aided design tools for engineers [4]. In the process of an engineering analysis, a theoretical and numerical model is the starting point for researchers to develop or design an engineering system. This technique has been accepted for design­ing and developing complex geometry over a shorter period of time and at much lower cost.

The cylinder head is one of the most complicated and challenging parts of engine, where FEA plays an important role in its optimization [5]. A limited amount of information is available regarding thermal stresses in cylinder head. Komo and Bryzik investigated the develop­ment of thermal stresses in engine components with isolative ceramic coatings [6]. A twin-cam 16-valves cylinder head and cylinder block structure accompanied with several important subcomponents under firing load and assembly loads were investi­gated using FEM. The physical behavior of the gasket bead and liner, the stiffness distribution of cylinder head, the preload of the cylinder head bolts, the residual insertion loads of valve guides and valve seats, and firing pressure have been thoroughly discussed [7].

Other investigators carried out the sealing and structural response analyses under assembly and firing load cases for several areas of interest. Recommendations obtained from the project were forwarded to designers for successful incorporation into and adjustment of other areas for design evaluation. They provided information in regard to the nature and magnitude of thermal and mechanical stresses in the cylinder heads [8-10]. For calculation of boundary conditions from combustion chamber side, the model of the engine combustion was performed by commercial computer software [8-9, and 11-12]. The goals of the analysis were to provide: (1) Validation of the natural gas engine thermo-mechanical simulation results as are compared with the results of base diesel engine; (2) Achieving the thermal and mechanical stresses; (3) Comparison of the stress magnitude with the limits of elasticity [13-15].

2. Experimental Measurements

The engine specifications under the study are shown in Table 1. To apply accurate boundary conditions and input data to run the computational model, experiment was carried out to measure different parameters such as coolant flow rate, coolant inlet temperature, inlet air flow rate, inlet air pressure and temperature, exhaust gas flow rate, and outside cylinder head surface mean temperature (Table 2).

In this project, the engine performance data was measured by a dynamometer at 1850 RPM. The engine under investigation was equipped with six thermocouples. Three thermocouples were installed on the outside surface of cylinder and cylinder head to measure the average outside surface temperature. The inlet and outlet temperatures of the water jacket and the gas inlet port were measured using three thermocouples. The pressures at the inlet and outlet ports were measured using Piezo-Electric pressure transducers. The accuracy of temperature measurement were 0.1 C, pressure 0.001 KPa, and mass flow rate  0.1m3/s.

3. Computational Methodology

Details of the effort include model definition, meshing, model analysis, validation of the Finite Element Analysis (FEA) model, and applying thermal stress, and displacement boundary conditions. The results of the stress analysis, stress field in the firedeck, and the material evaluation are provided. The analysis procedure is shown in figure 1. The first stage in the process is to define the model geometry. This was accomplished using three-dimensional solid modeling using a computer-aided engineering tool, Solid Works [11]. The data is imported from the solid model to the mesh generation software. Mechanical boundary conditions and model con­straints are defined and/or calculated to maximize the validity of the analysis given for the model [10]. Thermal and mechanical boundary conditions are applied to the finite element mode. The finite element analysis was carried out using a commercial finite element analysis software package, ANSYS [12]. The results are post processed into a form suitable for engineering assessment that accesses the analysis code's binary database and extracts appropriate results [13]. Local properties may be a function of surface finish, heat treatment, notch sensitivity, temperature, etc., and are an input by the user. Where the tem­perature dependency exists, user-input tables of temperature dependency calculate the local material property [14, 15]. The numerical analysis to calculate the temperature and stress distribution in cylinder head is achieved by multi-field technique. The essence of multi-field analysis is coupled-field analysis, which allows users to determine the combined effects of multiple physical phenomena (fields) of a design. If the input of one field analysis depends on the results of another analysis, the analyses are called multi-field. The applications of this technique include fluid-thermal and thermal-structure analysis. The computation processes for the analysis are shown in Figs 2 and 3.

3.1. Model Definition and Mesh Generation

The cylinder head model and its geometry are shown in Figure 4. The three dimensional solid modeling was performed by SOLIDWORKS [11]. The cylinder head mesh is constructed with ANSYS.

For thermo-hydraulic analysis, a model of the water jacket (Fig. 5) that receives local velocity and temperature of the cooling water was constructed. Flow charac­teristics of the water jacket, critical for keeping uniform firedeck cooling were analyzed using ANSYS. Also, brick-element mesh was constructed for water jacket with ANSYS. The combustion chamber is modeled by a computer software package, MATLAB, which calculate the gas temperature and pressure at each crank angle. The calculation is based on single zone model. For detail, see references [3, 16]. 

In any computational analysis, accurate mesh generation plays an important role. Therfore, sensitive areas are meshed with high resolution. The shape at the valve opening tapers outward near the firedeck, giving the valve bridge a smaller cross-section than any other location in the cylinder head. The valve bridge area is a region of concern and is finely meshed to determine accurately stress gradients as recommended by many investigators [4]. The completed three-dimensional model contains 507533 elements and 50965 nodes to model the cylinder head, and 733252 elements and 91244 nodes to model the water jacket. Element aspect ratios are chosen to be approximately 2.8 in the valve bridge area (Fig. 6). Away from the valve area, element aspect ratio less than 6.0 is used. However, this was not considered to be a significant problem because the stress gradients at these locations are very low. In the non-sensitive regions such as the top of the cylinder head, a coarse mesh is applied in order to reduce the number of elements and CPU time. The water jacket model of the cylinder head is meshed until the nodes of the interface of the cylinder head and water jacket models merge together. The results (along the x direction and across the y direction) indicate that the constructed finite element meshes with 7 x 3 elements in the bridge area would model the thermal process quite adequately. The thermal results of the finite element model that was constructed with this mesh criterion were compared with a highly refined mesh (two times refinement). The difference in results was considered acceptable (within 0.5 percent) for our study. In this analysis, it was found that the mesh types play an important role. Therefore, different types of meshes were examined until the mesh independency solution was achieved.

3.2. Thermal Boundary Conditions

In any thermal analysis, selection of proper bound­ary conditions is challenging, particularly for engine combustion chamber components, where boundary conditions may vary significantly both in space and time [16, 17]. The boundary conditions for stress analysis combine the results from the thermal analysis and displacement boundary conditions suitable for the cylinder head. In this analysis, only thermal and pressure loads from the combustion chamber were considered. This is not a serious limitation as thermal stress is the dominant form of stress in the cylinder head [18]. In this work, the regions of high stress were sought rather than a particular highly accurate stress value. To satisfy the thermal boundary conditions, the con­vective heat transfer coefficient should be calculated for all the following regions.

3.2.1 Outside Boundary Condition

To apply outside boundary conditions, the Rayleigh equation (1) is used for a free convection surface [17].

                                                                                                                     (1)

The value of  is 0.25 and  is 0.52

The Rayleigh and Grashoff numbers are calculated by the following equations,

                                                                                                                                                  

                                                                                                                                (2)                                                                                                                                                    

                                                                                                                 (3)

3.2.2 Inlet and Outlet Ports Boundary Condition

To calculate the thermal heat transfer coefficient in the intake and exhaust ports, Christopher equation is used [19]:

                                                                                                                 (4)

Where,

                                                                                                                              (5)

The value of  is acquired from CFD or experiment. Air temperature in this turbocharged engine at the inlet port is 337.1 K, and the gas temperature at the outlet port is assumed to be the same as the combustion chamber gas temperature when the exhaust valve is opened. It was calculated as follow [20]:

                                                                                                                (6)

3.2.2 Water Jacket Side Boundary Condition

The prediction of the tem­perature distributions is achieved by solving the energy, momentum, and mass conservation equations simultaneously. Therefore, the water jacket inlet pressure and/or velocity are required to apply as boundary condition in the CFD model.   For this purpose, the inlet water flow rate and temperature are measured. [21, 22].

3.2.3 Combustion Chamber Boundary Condition

To calculate the thermal heat transfer coefficient in the combustion chamber, the Woschni equation (7) is employed. To use this equation, pressure and temperature should be calculated at each crank angle.

                                                                                                (7)

In this equation b is the cylinder bore,  is the average of gas velocity, which is almost equal to average of piston velocity. Figure 7 shows the gas pressure and temperature profiles in the combustion chamber

3.3. Stress Boundary Conditions

In order to reduce the complexity of the boundary conditions for stress analysis, the interaction between the cylinder head, cylinder head gasket, and cylinder block was not modeled. In fact, the cylinder head and the cylinder block were assumed to expand at the same rate for all points of contact between the cylinder block and cylinder head. This simplification does not allow the cylinder head bolts to constrain the thermal expansion of the cylinder head. Therefore, the thermal stresses are expected to be under-predicted. The other boundary condition is the pressure load that is applied to the combustion chamber. The maximum pressure of 10.5 (MPa) is used in this analysis. The boundary condition of the bolt is very significant since a pre-load is necessary to define tightening of the bolt. In this analysis, it is assumed that the surface interface of the cylinder head and bolt is moved inward. There is no outward movement for this surface. Therefore, for modeling, the contact element between the bolt and cylinder head is used [14].

4. Results and Discussion

As explained before, the first step in the analysis is to validate the computational model. The com­parison of experimental and computational results is shown in Fig. 8. Nodes 1—8 in this figure are corresponding points to the numbers 1—8 in Fig.9. The calculation is performed for one temperature cycle at high coolant temperature. It is evident that a very good correlation exists between measured and calculated strains for lower temperatures where elastic material behavior predominates. For the higher wall temperatures exceeding 200 C, the calcu­lation overestimates the influence of inelastic material deformation as compared with the measured values.

It is concluded (Fig. 8) that the Van Mises stress results are matched relativity very well. Therefore, the model can represent the baseline engine cylinder head and it can be further used for parametric studies.

The com­parison of Diesel and Natural Gas Engines stress analysis results is shown in Figure 10. The results of Von Mises stress for Natural Gas Engine in cylinder 2  are 1.12 times more than corresponding points in the diesel engine. This is due to higher temperature of Natural Gas.Thermal and structural analysis results show the temperature and Von Mises distribution in cylinder 2 are higher than the others. So, our discussion is concentrated on cylinder 2. It is assumed that the temperature in the water jacket is constant. Figs.11 and 12 show that the temperature at the cylinder bridge is high in both engines; and consequently the temperature gradient at this region remains high. It is also concluded that the tem­perature distributions are different in all cylinders since the cooling water enters the left side of the bottom end of the block and exits from the left side of the top end of the cylinder head. Therefore, cylinder 1 is cooler than the others and the temperature gradient in cylinder 2 is higher than the other cylinders. Also, the highest temperature at the centre of any cylinder decreases away from the centre. This causes a high temperature gradient at the surface of the combustion chamber. This is due to the fact that far away from the centre, the cooling water flow rate is larger than at the centre of the firedeck. The results predict a large compressive strain and stress field at the valve bridge and seats on the firedeck of the cylinder head. These stresses are primarily due to relatively large temperature difference existing at the liner interface. The maximum temperature at firedeck is 616 K in Natural Gas and 549 K in Diesel engine. The results show that the temperature gradient at the gas side of the cylinder head of the natural gas engine is approximately 53 ºC/mm, and it is 5.6 ºC/mm for the coolant side of the cylinder head. Inside the liner, the temperatures on the firedeck change from 438 K to 616 K at high load operating conditions, while outside of the liner, the temperatures are relatively low at 293 K to 360 K.

 The thermal expansion of the hot region is constrained by the stiffer cool region, which undergoes less thermal expansion. As a result, a compressive thermal stress field is created inside the liner. Figure 13 shows the temperature distribution contours of the cylinder head. The maximum stress on the cylinder head also showed similar results. In this work, first, the maximum cylinder gas pressure is applied to cylinder 2, then to the other cylinders. It is concluded that the average stress in the cylinder head reached its maximum value when the cylinder head 2 is under fire. When cylinders 1, 3, and 4 are under fire, the maximum stress is observed in cylinder 2 because the temperature gradient in cylinder 2 is more than in the other cylinders. Also, higher stress in the valve bridge and near the valve seat is seen in Figs.14 and 15 because the thickness of material in the valve bridge is higher and cooling flow rate is lower. Figures14, 15, 16, and 17 show larger compressive strain and stress at the valve bridge and seats on the firedeck of the cylinder head. An important observation from the result of the analysis is that the predicted Von Mises stresses exceed the limit of elasticity (dark areas in Fig. 18) for a typical cylinder head material [25]. This high stress would lead quickly to destruction of the cylinder head.

5. Conclusion

The maximum compressive stress is observed in the valve seats and valve bridge. Natural Gas engine stress is about 1.12 times higher than Diesel engine. High stresses at the valve bridge resulting from a constrained thermal expansion of the cylinder head are generally compressive. It is concluded that about 82%–87% of the total stress is thermal and the rest is due to pressure and mechanical stresses.

 The temperature gradient at the surface of combustion chamber is not uniform. The maximum total stress was found in cylinder 2. The Von Mises stress value of the Natural Gas engine exceeded the elasticity limit of material used for the cylinder head. This high stress would lead to destruction of the cylinder head. It is recommended modifying the current cylinder head material from cast iron GG-26 to GG-30 in order to prevent failure of cylinder head. The engine cooling system should also be improved to reduce the area with maximum compressive stress.

REFERENCES

[1]. Spaniel, M., Macek, J., Divis, M., Tichanek, R., "Diesel engine head steady state analysis", Research Report of Technical University in Prague, 2003.

[2]. Assanis, N., "Multi-Dimensional modeling of Natural gas ignition under compression ignition conditions using detailed chemistry", SAE paper 980136, 1998.

[3]. Bryzik, W., Wood, M., Schwarz, E., and Glance, P., "High temperature engine component exploratory design development", SAE paper 890296, 1989.

[4]. Tichanek, R., Spaniel, M., Divis, M., "Steady state heat analysis of engine head", Research Report of Technical University in Prague, 2002.

[5]. Woods, M., Schwarz, E., and Bryzik, W. "Advances in high temperature components for the adiabatic engine", SAE paper 910460, 1991.

[6]. Komo, R., Bryzik, W., "Performance and durability of a ceramic coated adiabatic engine", ASME ETCC Symposium, New Orleans, LA, January, 1990.

[7]. Chyuan, S., "Finite element simulation of a twin-cam 16-valve cylinder structure", Finite Element in analysis and Design, Elsevier Science Publishers B. V., Amsterdam, Netherlands, 2000.

[8]. Roelle, M. J., Shaver, G. M., Gerdes, J. C., "A multi-mode combustion model of SI and HCCI for mode transition control", international mechanical engineering conference and exposition Anaheim, California, USA, November 13-19, 2004.

[9]. Cranfield, A., "Effects of diesel water emulsion combustion on diesel engine NOx emissions", MS Thesis of Florida university, 1999.

[10]. Trigui, N., Griaznov, V., Affes, H., Smith, D., "CFD based shape optimization of IC engine", J. of Oil & Gas science and Technology, Vol. 54, pp.297-307, 1999.

[11]. Reyes, A., "Beginner's guide to Solidworks", Schroff Development Corporation (SDC) Publications, India, 2005.

[12]. Lawrence, K., "Ansys workbench tutorial", Schroff Development Corporation (SDC) Publications, India, 2005.

[13]. Segerlind, L. J., "Applied finite element analysis", 2nd Edition, John Wiley, 1984.

[14]. Jorwekar, P., Birari, V., Nadgouda, M., "Cylinder head gasket contact pressure simulation for a hermetic compressor", International compressor engineering conference, Purdue, July 17-20, 2006.

[15]. Catania, A. E., Misul, D., Mittica, A., Spessa, E., "A refined two-zone heat release model for combustion analysis in SI engines", The 5th international symposium  on modeling of Combustion in IC Engines, Comodia, 2001.

[16]. Ferguson, C. R., "Internal Combustion Engine", John Wiley, New York, 1986.

[17]. Wendl, M. C., "Fundamentals of heat transfer theory and applications", Class notes for ME 371 of Washington University, Version 2.1, 2005.

[18]. Tatschl, R., Basara, B., Schneider, J., Hanjalic, K., Popovac, M., Brohmer, A., Mehring, J., "Advanced turbulent heat transfer modeling for IC-Engine applications using AVL fire", Research report of international multidimensional engine modeling, Detroit MI, April 2, 2006.

[19]. Christopher D., Dennis A., "A universal heat transfer correlation for intake and exhaust flows in a spark-ignition internal combustion engine", SAE paper 2002-01-0372, 2002.

[20]. Pulkrabek, W., "Engineering Fundamentals of Internal Combustion Engine", Prentice Hall, 2nd Edition, 1997.

[21]. Chang, J., Guralp, O., Filipi, Z., Assanis, D., Kuo, T.W., Najt, P., Rask, R., "New heat transfer correlation for an HCCI engine derived from measurements of instantaneous surface heat flux", SAE paper 2004-01-2996, 2004.

[22]. Taylor, C. F., "The internal combustion engine in theory and practice", MIT Press, 2nd Edition, 1966.

[23]. Woschni, G. A., "A universally applicable equation for the instantaneous heat transfer coefficient in the internal combustion engine", SAE paper 670931, 1967.

[24]. Pischinger, S., "Internal combustion engine", VKA paper, institute for internal combustion engine, 2007.

[25]. Germany Industrial Norm, "Material standard DIN paper 1691", 1985.

Nomenclature

                        Area (m2)

                        Cylinder bore (m)

                       Average diameter of inlet and outlet ports (m)

                       Acceleration of gravity (m/s2)

                      Grashoff number

                        Convective heat transfer coefficient (w/m2K)

                        Thermal conductivity coefficient (w/mK)

                              Mass flow rate (kg/s)

                     Nusselt number

                       Gas pressure (pa)

                      Intake cylinder pressure (pa)

                      Exhaust gas pressure (pa)

                      Prandtl number

                      Rayleigh number

                      Reynolds number

                       Temperature (K)

                              Exhaust gas temperature (K)  

                             Ambient temperature (K)

                       Gas velocity (m/s)

                      Displacement volume

Greece Symbols

                       Coefficient of volumetric thermal expansion (k-1)

                       Dynamic viscosity (kg/ms)

                        Kinematic viscosity (m2/s)

CAPTURES

Table 1.  Engine specifications

Table 2.  Natural gas engine experimental data to be used for computational modeling

Figure 1. Thermo-mechanical analysis procedure

Figure 2. Multi-field computations procedure for CFD-Thermal a: formulation b: loops sequence

Figure 3. Multi-field computations procedure for Thermal-Structural

Figure 4. Model of the engine cylinder head

Figure 5. Model of the water jacket for CFD analysis

Figure 6. Top view of nodes distribution in combustion chamber of the cylinder head.

Figure7. Pressures and temperature profiles in Natural gas and diesel engines.

Figure 8. Comparison of the experimental and computational stress results, node numbers

correspond to the points on the cylinder head in Fig. 9

Figure 9. Location of measured and computed stress in the cylinder head

Figure 10. Comparison of Von Mises stress distribution on fire-deck of combustion surface of Natural gas and Diesel engine cylinder head

Figure 11. Temperature contours on the firedeck of the combustion surface of Natural gas engine (K)

Figure 12. Temperature contours on the firedeck of the combustion surface of Diesel engine (K)

Figure 13. Temperature distribution contours on the firedeck combustion surface (K) of Natural gas engine

Figure 14. Von Mises stress contours on the firedeck combustion surface of Natural gas engine (MPa)

Figure 15. Von Mises stress contours on the firedeck combustion surface of Diesel engine ( MPa)

Figure 16.  Von Mises strain contours on the firedeck combustion surface of Natural gas engine

Figure 17.  Von Mises strain contours on the firedeck combustion surface of Diesel engine

Figure 18.  Von Mises stress on the firedeck combustion surface more than yield stress

No. of Cylinder

4

Max Power

81 KW @ 2800

Max Torque

350 N.M @ 1600-2100 RPM

Compression Ratio

11:1

Cylinder Bore

97 mm

Stroke

128 mm

Volume

3780 cm3

Cooling Water Capacity

8 Liter

Fuel

Natural Gas

Air Induction System

Turbocharged and Intercooler

Fueling Strategy

Lean Burn

Table 1

Parameters

Measured

Coolant flow rate (m3/h)

Coolant inlet temperature ( K)

Coolant outlet temperature (K)

Inlet air flow rate per cylinder (kg/h)

Inlet air temperature ( K)

Exhaust flow rate per cylinder (kg/h)

Fuel flow rate per cylinder (kg/h)

Cylinder head mean temperature of the outside surfaces of ( K)

Inlet air pressure (KPa)

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Styles Of Mercedes Factory Wheels

A new set of Mercedes factory wheels can give a car a different look or provide a welcome replacement for damaged rims. Unfortunately, there are several distinct styles of Mercedes factory wheels, and if you're looking to buy new rims, it's important to know about the major differences. This will allow you to make a better decision to meet your vehicle's needs.

The ML series of Mercedes factory wheels ranges from 16-20 inch rims and is designed for the ML series of cars (this is a trend with Mercedes factory wheels; the letter for the wheel will be the letter proceeding the intended vehicle's model number). ML series rims have polished aluminum and fit a variety of vehicles in the ML series, which is the company's line of SUVs. They have five lugs and 112mm bolt holes, as is the case with all Mercedes factory wheels.

Another series of wheels is the C class, which is intended for all Mercedes vehicles with a C, including the CLK and CL series. These sports car rims are wider with a higher offset, so they can't be used with other Mercedes or non-Mercedes vehicles.

The S class of Mercedes factory wheels is made for S series cars, which are luxury vehicles. They're among the most expensive factory Mercedes wheels and fit on S series, SLK, and SL class vehicles. These rims are offered in 18 to 20 inch sizes, allowing Mercedes owners to customize the look of their vehicles' wheels.

The final class of Mercedes factory wheels is the E class. They look thin and small compared to the other Mercedes factory tires on this list, which makes them a poor replacement choice if your vehicle didn't already have E class wheels installed. However, they are exceptional-looking wheels, and can be polished to a fine shine for the right vehicles.

If you're not sure which set of Mercedes factory wheels to buy, check your vehicle's manual or talk to a tire shop. You can also browse online to try to find a wheel supplier that offers information on the interchangeability of tires. To save money, many drivers decide to look into aftermarket replicas, which can give the same look and feel of Mercedes factory wheels at a lower price. As is the case with all wheels, you should be certain that the product that you're considering will work with your vehicle before ordering, and the best way to do this is simply to understand the differences between the classes and how they'll look on your car after they have been installed.

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Simple Water Fuel by Thomas Greene - Is it a Scam?

Is Simple water fuel by Thomas Greene scam? Obviously no. The reason is not that the author is famous but in fact you can check the positive reviews out there spread like a wild fire all over the internet which reflects the status about the product, simple water fuel by Thomas Greene.

Rising fuel prices are really annoying as a result almost everyone is searching for any alternative method to power their houses and automobiles. Not only this, it is also becoming really significant to search for alternatives to save the environment. You might be questioning that what does simple water fuel by Thomas Greene can do?

Simple Water Fuel will not only show you how you can save upto 67.34% fuel. That is around 1000 bucks saving. Not only this, with the help of the method inside Simple water fuel ebook by Thomas greene you will be able to triple your mileage and it will also improve the performance and minimize the smog.

The thing which I like the most about the Simple water fuel by Thomas Greene is that by implementing the method inside the Thomas Greene ebook you will not only save your hard earned money but also you will be able to save the environment at the same time.

As far as this is concerned that, is simple water fuel by Thomas Greene is a scam or not? Then I personally think that it is not. Because they offer 60 days money back guarantee!!!!If for one reason or any you are not satisfied with the results you can ask for the money back. Not only this, if you buy Thomas Greene ebook then you will also receive bonuses which you can find out by clicking on the link mentioned below.

For me personally, the simple water fuel ebook by Thomas Greene is a great ebook which will cut my expenses to half. As we spend around $500-$1000 only on fuel expenses, so isn't it better to cut these figures by half? Of course yes. Click the following link to read more detail about the ebook.

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Electric Van Fueling Stations

You might have noticed over the past few weeks we have written a green spin on many of our articles. This has been as we now see this as a real surge in the automotive industry. Whilst the technology and makes of vehicle are still quite new the technology is improving very fast. 

Spend a few minutes whilst your online and Compare Van Insurance prices. Make sure you are getting a great deal on your policy.

From looking in to the issue in more depth in recent times we have found that one of the main barriers for motorists see is the problem of charging/re-fueling the vehicle. Initially we saw a surge in conversions to gas powered cars. However only a few forecourts had the right pump to fill up. Also the cost of converting a fuel based car to gas was quite steep 

We are very happy to announce that Elektromotive has installed the UK's first three phase charging station. This new type of charging station is catered towards re-furling light commercial vehicles. 

This is great news for the commercial industry who might be looking for a cheaper and greener alternative to oil powered vehicles. The theory behind a business changing to green fuel might have many reasons. Not only the fact that oil prices conitnue to rise by the day increasing variable costs. The new station has been introduced into a depot in Camden. What is even more excellent is that the station sources most of its energy from solar power. Therefore charging is completely free to users. 

The charging station delivers an awesome 400 volt output making it excellent for light commercial vehicles carrying a load. The installation has been brought about after the Camden council is trying to be the first council in the country to run its own fleet completely powered by renewable energy. Thinking about this as a statement, its actually quite huge. It shows that if the will is there and the infrastructure supports the demand a company could operate with no fuel costs and no harmful emissions. 

This is even bigger news for the country as a whole. It is thought that one of the main contributors to the UK's carbon footprint comes from commercial vehicles. It also very to see how this is the case, taking a trip down any motorway gives a clear sense that there are a huge amount of commercial vehicles on the roads. 

It is thought that if the first unit is successful Elektromotive will roll the unit out to further sites across London. Their managing director made it clear that if there is demand they will supply the charging points. This is great news for UK business trying to control their fuel costs. Whilst this initiative is in London currently if the Camden Council can reduce their fuel bill to nothing then the other councils will not be far behind them. 

Compare Van Insurance prices today and reduce your spend on your policy. Increase profit margins by reducing your fixed spend today.

This also shows a huge commitment from the city of London. It seems they are trying to become a completely carbon neutral city. Especially where it comes to vehicle emissions. They started there battle some years ago introducing the toll zones with the aim to reduce congestion. This is just the next step in the process and we cant wait to see the next.

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Best place to Buy Marine Engines

The best place to buy marine engines depends on your level of experience in the area. Buy online or from your local dealer, it is just a matter of where you feel most comfortable.

Buying marine engines from a dealer

This is usually recommended for first time buyers. Buying a marine engine may be confusing if you do not know what to look for. A dealer is usually very experienced in this area and can offer a first time or even an experienced buyer, invaluable tips in this area. Be careful of dealers who try to sell you the most expensive engine, always do your research and choose quality and high performance engines every time.

Buying marine engines online

Buying marine engines online opens up a whole new world of possibilities for the buyer. For a first time buyer it is recommended that you do your research first before making any purchases. Know the specifications on the engine being sought and visit customer comments or blogs on varying brands, this will help tremendously.

Exclusive tips to buying marine engines online

For high speed jet engines always go with Honda marine jet engines. These engines have a stellar reputation and offer maximum performance and speeds in addition to strong horsepower.

For engines of any size and power always opt for Mercury Marine. Mercury Marine is a company dedicated to everything marine and has a reputation as one of the best marine racing companies. Mercury engines are built to last and are extremely powerful.

Flagship marine engines does not build its own marine engines, it is a distributor of them. This site offers engines in a variety of brands from GM to REV. This site is recommended for those who have already done the research on the type of engine needed and knows exactly what to look for. Don't be overwhelmed by the many brands, just take the time to sift through thoroughly.

The best place for buying marine engines is both from a dealer and online. Going to your local dealer may not be the best choice if you like variety. Even though a marine engine dealer may order the engine of your choice you may still find some great deals online if you are experienced in the area. If you are a first time or inexperienced buyer you may want to choose a dealer to help you navigate your way through what may seem like the confusing world of boat engines.

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