Leadfoot350 Posted March 16, 2004 Report Share Posted March 16, 2004 How do you find out what the volumetric compression is for a two stroke. There is a formula and I have heard that you just put one piston at tdc and use a burette to find out how many CC's you have. Does anyone know the formula? Quote Link to comment Share on other sites More sharing options...
Ducman Posted March 16, 2004 Report Share Posted March 16, 2004 The compression ratio on a 4 stroke = (the volume of the cylindar with the piston all the way down pluss the head volume) / (divided by the head volume). So I guess the volume on a 2 stroke would be the (volume of the cylinder where the piston has just closed the exhaust port pluss the head volume)/( divided by the head volume). I believe the exhaust port variable is why most people just measure compression to get PSI. Also on a 2 stroke the dynamic compression can be very different than the static compression due to all the hot gasses stuffed into the cylender by the presure wave created by the pipes as the piston closes the exhaust port. Not quite as different with a 4 stroke unless you have a turbo or another type or forced induction. Quote Link to comment Share on other sites More sharing options...
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