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The Sprite Forum

Compression

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A567 Alfred Nesbitt
Buckhannon, W.Va., USA   USA
How much Compression should one expect from a healthy 948 Austin Engine?? 59 Model !

Thanks

Al

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S1 Elan Kurt. Appley
Akron, Ia., USA   USA
Can't say but how much have you got?? I would expect at least 120 and not varying more than 10 or so.

Kurt

napamike Mike Afentakis
Rogue River, OR, USA   USA
I can't say, but I would suspect Kurt is in the ballpark. Be advised if the head has been milled the running compression will be higher than expected. Now that being said, the best way to check your compression is once dry and record, then a second time with oil on top of the piston rings. Compare the figures.
If compression increases in any or all suspect cylinders, you have a piston ring sealing problem. If compression is unchanged in a suspect cylinder you have a valve issue. Just knowing what compression the cylinders have is only part of the diagnostic puzzle.

Hope that helps a bit.
Mike

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