On Thu, 20 Nov 1997 19:19:24 -0800 Sergio Dimarmo <wanderer(at)sure.net>
writes:
>What should the compression reading be for my Series V engine (it is a
>1725)? I'm reading about 120 on all cylinders but that does not sound
>right. Head was re-done a few weeks ago and the engine has about
>50K-60K
>miles. Oil pressure is 45 PSI hot above 2000 RPM and 20-25 PSI hot
>idle.
>Haven't done a ring check yet but just want some ideas on what reading
>I
>should see with my compression gauge.
>
>Serg
The most common error in testing compresion is in NOT cranking the
engine with the carbs at wide open throttle.
Did you?
If you did, 160 to 170 PSI would be great.
140+ would be fair to good.
below 130 is ........ Tired.
The oil pressure you site is livable, but if the compression figures
are as stated, you could use some rings and new bearings to say
the least.
New rebuilt head, or lack of it, would not affect the compression
figures unless a valve was bent, maladjusted, or burnt.
Jarrid
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