[tech]: help with compression readings...pretty please?

[Larry" <rocco16v@netzero.com (Larry)]

Michael-
  #3 is Bad.. .. period.
remember, the absolute numbers are not as important as the psi uniformity
between cylinders...

If you got 300+ on your wet reading, you used too much oil.  it only takes
1/4 oz.....
Do it again....

Performance?  Higher psi = more pppooowwweeeerrrrr! (right up until she
sends a piston into the oil...)
Larry  sandiego16V


> compression on the new 16v rocc, which though it has more mods than my old
> 2l/2l head combo, seems quite a bit slower. i got:
>
> 215/215/170/215
>
> i don't think the scale is accurate, but the 215's are what i got on the
> "old" newly rebuilt engine, so i assume they are really in the 180-190
> range. cylinder #3 is barely, if at all, out of spec (>44 psi below other
> readings). when i crank it though, it doesn't rise as fast on the first
> crank as the others. sometimes it doesn't move till the second crank.
>
> tried a wet compression test, but i think it was useless since the
readings
> were above the gauge's scale (~300).
>
> i'm thinking a stuck valve maybe, broken piston ring, or headgasket? the
> engine supposedly has 34k on it (mods below), and is super quiet/smooth
for
> a scirocco 16v. no evidence of headgasket leak.  anyway to a) find out for
> sure short of pulling the head, and b) unstick the stuck valve, if that's
> what it is?
>
> lastly, stupid question, but how much of a performance issue should these
> readings be? thanks,
>
> -michael
> new 87 16v scirocco with: 1.8 bottom bored/stroked to 2l, 1.8 head with
euro
> intake, fuel enrichment, tt header/ss exhaust.
>
> old 88 16v: 2l bottom/2l top. stock dp/cat, tt cat back.
>
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