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Message: <blockquote data-quote="speed2horizon" data-source="post: 2936343" data-attributes="member: 30831">Compression ratio is simple to calculate as long as the pistons are not changed. Let say adding on metal head gasket.CR = Bottom clearance volume / top clearance volume. cuttin g off the pi(3.142) and bore for the area calculation because the bore area does not change. So ended up with the calculation ==>CR2 = (S + TCh + Gt) / (TCh + Gt)whereS= stroke *stroke length of an engine can be find in magazzines and iternet resources. TCh= Top clearance height * can be calculated via deviding the Bottom clearance volume(cc per cylinder) with the Top clearance volume and comparing it with the initial compression ratio(CR1). U will get the the TCh.Gt= is the Gasket thickness * as you wish to buy. Adding on metal gasket is just like incrasing the TCh though bigger Top clearance volume.So, CR2 can be achieved.*Calculation only applies if uses the same pistons.But the when engine rojek comes in, more things need to be done. Can actually get the volume by using melt candle to fill the volume, let it solidify, and take it out to and immerse to water. From the water that is being displaced, Got the volume...However, having to say that boosting 1 bar = forcing another 101.325kPa of air into our combustion chamber with double the amount of fuel ( theoretically ). Meaning to say, the displacement is being doubled and the compression ratio will also doubled. For example my engine, 10:1 become 20:1. Imagine the stresses the pistons, cylinder wall, valves and all the other internals are handling. And most of the machineries are designed with factor of safety = 2 or above. However, double stresses is actually coming to the limit of factor of safety 2.At the end of the day, the question is, what is the compression ratio our parts are designed for?? And what is the boost limit our blocks and internals can take before it fails. That is the trade secret of manufacturer...</blockquote>

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