Is DCR useful? Some people think so, others do not. Will DCR change in a running engine due to things like push rod defection, YES. What DCR is not, is a way to tell what the pressure in the cylinder will be @ IVC. What it is, is a way to tell how much the charge @ IVC weather it is .8 bars or 1.6 bars will be compressed. Things like inertia ramming of the intake charge will increase the pressure @ IVC but that does not change the DCR.
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Bryan
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