jarrid_gross(at)juno.com wrote:
>
> 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
I have always done the test with throttle closed, thanks for the tip. I
remember seeing something about Alpines with low compression pistons,
could this apply to my Series V and if so what would be a normal reading
with these pistons?
Serg
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