Reply to "compression ratio"

bosswrenchMember

No- it will all be a guess. After 33 years and heaven-knows-how-many overhauls, all the components that determine compression ratio in a given engine may be changed, worn or remachined. You'll have to physically measure the ratio to be sure. Keep in mind, the engine doesn't know or care about the ratio; it only responds to compression pressure. So an engine at 11:1 with a radical cam may actually have a lower pumping pressure at startup than a 10:1 engine with a mild cam. Incidently, a compression gauge is not dependable for this type of test but pressures of 180-and-up psi during a compression test means there are seriously non-street-type parts in there. 110- octane racing fuel will make about any musclecar engine run good but most of us can't afford $6.25 a gallon on a regular basis.....

8/18/0411:01 PM

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