Cranking compression

mikesduster said

Again,I think my compression gauge is 10psi off. It zeros out at 10,not 0. I just rechecked #1,#2,#7 and #8. I checked them 2-3 times each and my gauge read between 190 and 200 which means it actually between 180 and 190. I dont have the money to buy a new gauge so im gonna have to use these numbers till I can get another tester.

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I would consider 190 pretty acceptacle for 12.1. In the end, what pump gas you can get by with really has nothing to do with static compression ratio or cranking pressure. It has to do with dynamic or "running" compression. That's what you need to calculate to see where you stand. There are several online calculators. United Engine and Machine has one.