- Jun 17, 2018
I very much doubt that the N53 combustion chamber is any larger in volume than that of the N54, and my cranking compression #s appear to back this up. K
Not the same thing.
Measuring cranking PSI is a dynamic compression.
Measuring static volumes, piston, head gasket, combustion chamber is how a static compression is found.
Dynamic can be affected by port design and cams. Even doing a closed throttle vs open throttle can/should show differences in dynamic.