phil sims wrote:
>
> Is the correct way to determine compression ratio to simply divide your
> measured compression (in my case 140lbs each) by 14.7(standard ambient air
> pressure)?
>
> Or is there more black magic to the equation?
You really can't calculate compression ration from compression
pressure. The air will heat up during compression increasing the
pressure. The valves are not closed at top or bottom dead center
letting air out especially at the low rpm generated during cranking.
Sorry.
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