Vacuum/Mechanical Advance Dilemma SB340

RustyRatRod said
Run the compression test and report back. That will give us a lot to go on. Keep in mind compression ratio has zip to do with cylinder pressure, which is what you will be measuring with the compression test. The two are related, but that's it.

Thanks Rusty so what do we learn from the cylinder pressure? Can we back into the CR or estimate the CR from this?