Gaskets are designed to compress when the head is bolted to the block, this adds to the strength as it bonds to the metal surfaces. Using multiple head gaskets to lower the compression ratio IS A BAD IDEA. In most situations, tuners will select a variety of these options, based on the desired torque band and power output of the engine they are building. Many view this as a good thing as replacing a decompression plate is a lot easier to do than replacing pistons and heads. The decompression plates may fail prematurely in high boost applications where high temperatures are involved. Plates can be made of a variety of metals and we suggest you talk to a specialist about your options here. Decompression plates are essentially an extension to the head and can be very effective at reducing the compression ratio.The block side needs a conventional gasket seal but the head side generally only requires a nonsetting high-temperature sealant (in the case of aluminum decompression plates).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. A 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.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). However, it requires great skill to do a proper job on the head and achieve the lower compression ratio you are seeking. 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.Removing the head is relatively simple and does not require as much effort as other compression lowering mods.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. A crankshaft with less stroke is what you need to reduce the compression ratio.A shorter stroke will have a dramatic effect on the compression ratio and is the route to go if you are adding a turbo.īy combining this method with low compression pistons one can start to think about running very high boost pressures when adding a turbo.
#MR20DE ENGINE COMPRESSION READING MODS#
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. We would recommend combining low compression pistons with a shorter stroke to get the most benefit.The shape of the piston crown will also have a bearing on the amount of compression that takes place in the engine.
#MR20DE ENGINE COMPRESSION READING PLUS#
The pistons are much shorter than conventional ones, thereby decreasing the stroke.A small plus is that they are also often lighter so the engine will rev a little more freely. 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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