![]() ![]() ![]() There was no humidity in the air the engine drew in The cylinder head, bore walls and piston were perfect insulators If the camshaft closed the exhaust valve at top dead center and the intake valve at bottom dead center Re: Does psi compression relate to compression ratio?Įngine Analyzer 3.2 does a pretty good job of taking every thing into account and calculating a cranking compression PSI The Cylinder pressure mainly just tells you the health of the cylinder with some relation to the Compression ratio.Īnother way to think about it is you could have a 11:1 compression and the rings have a lot of blow by due to cylinder wear you might get 110 psi where as on a good motor it should be at 160psi (psi figures not exact just for example), that 11:1 with a long duration came could read at 125psi for a good motor and 90 psi for one worn out The PSI doesn't tell you the compression ratio but if you know the compression ratio and engine build you can see if the cylinders are good based on the compression test. ![]() This can not say that a 125 psi can not have higher compression but due to lots of overlap in the cam it is bled off at lower rpms (where you check compression) but in the higher rpms it doesn't have time to bleed it off creating the high compression at a higher rpm.īasically you can get a relative reference but without knowing the chamber size the, the quench, piston (dish,dome) Deck Height, stroke and bore, and cam specs with installed centerline its impossible to calculate the compression ratio. There is a correlation though if you have 160 psi more than likely you either have higher compression or a small cam. There is no direct correlation but based on experience some people can give you a hypothetical approximation. ![]()
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