What would fair-good-perfect Compression be on a 128D Engine? I'm going to check the compression tomorrow and was wondering what these numbers should be.
What's just as / more important in most people's minds is the deviation between cylinders. Should be no more than 15-20% between min and max. Typical numbers that you might get are 110-140 psi. Higher is OK, lower than 110-120 would be a concern, even the deviation was close.
