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Compression? 140-160

posted by  walrus3 on  Mon May 27 05:04 CST 2002
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last visit: Mon Dec 2 14:20 CST 2013
[RELATED]

155 doesn't sound low to me. That is better than 11:1 effective
compression ratio. Remember that atmospheric pressure is 14.7 psia.
So it started at 14.7 psia and went to 169.7 psia. That calculates to
11.5...
(which seems a little high for a B20B!)

In any case if its performance is satisfactory and it is not leaking
or burning oil, DON'T MESS WITH IT! It's FINE!!

BTW my book says 9.3:1 CR for your engine and it also says 170-200 for
compression test pressure. It doesn't say whether that is a gauge pressure(psig) or an absolute pressure (psia) but my calculation based on 14.7 psia
yields a gauge pressure of about 137 psig for 9.3:1 cr

BTW(2) I have run engines with compression pressures as low as 40 psig.
(Didn't run very well, though.)

--
George Downs Bartlesville, Oklahoma






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