![]() ![]() This is by far the easiest method of reducing compression but the risk is that you are more prone to head gasket failure and the gains in lower compression are minimal. We have also seen people using 2 gaskets (or more) to achieve a lower compression ratio! * Using multiple gaskets is certainly not recommended and introduces a major weak spot in an engine (see below).Ī thicker gasket will reduce the compression ratio by a small fraction, probably only by. This option is a bit of a bodge, but we should mention it as a lot of people do run thicker gaskets to achieve a lower compression ratio. Replacing the head with a different profile one can also reduce the compression ratio slightly. However, it requires great skill to do a proper job on the head and achieve the lower compression ratio you are seeking. Removing the head is relatively simple and does not require as much effort as other compression lowering mods. Head work, again increases the volume of the cylinder but the effectiveness depends a lot on how the intake and exhaust valves are sited, and how much space there is for you to work with.Shorter rods will accelerate faster and requires careful adjustments in the valve timing. Interestingly changing rod length will not affect the cylinder capacity, this is set by the bore and piston area. The crank will also have some impact on the throw of the engine and the crank, piston crowns and rods should ideally all be matched up. By combining this method with low compression pistons one can start to think about running very high boost pressures when adding a turbo. Therefore a crankshaft with reduced stroke is what you need to reduce the compression ratio when combined with lower compression pistons as you are typically working to the same deck height.Ī shorter stroke will have a dramatic effect on the compression ratio and is the route to go if you are adding a turbo. Anything that makes the combustion chamber larger will lower the compression ratio if the pistons travel a shorter distance and do less "compressing". Shorter rods, revised shorter stroke crank = lower compression.In most cases a rebore will increase the compression ratio of your engine. Increasing the cylinder capacity can potentially lower the compression ratio, but this very much depends on the stroke, rods and pistons selected. This will require a strip down of the engine and whilst the engine is apart you may just as well perform some of the other mods listed below. The shape of the piston crown will also have a bearing on the amount of compression that takes place in the engine. We would recommend combining low compression pistons with a shorter stroke to get the most benefit. A small plus is that they are also often lighter so the engine will rev a little more freely. The pistons are much shorter than conventional ones, thereby decreasing the stroke. This makes even more sense if you using forced induction to increase the power of your engine.ĥ good ways to reduce your compression ratio While you are reducing the compression ratio it would make sense to strengthen the internal engine parts. Best ways of lowering an engine compression ratio. ![]()
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