low compression--update

[abatzis2@hotmail.com (Michael Abatzis)]

yeah, forgot to mention that the cylinder wall was perfectly smooth 
(actually hatch-marked), identical to the others.

-Michael Abatzis
Hotlanta! GA
1988 Scirocco 2L 16v RIP-->parting, finally taking orders: 
www.learnlink.emory.edu/~mabatzi/mikes_page1.html
1987 Scirocco 2L 16v...




>From: "Allyn" <amalventano@sc.rr.com>
>To: "Michael Abatzis" <abatzis2@hotmail.com>, <scirocco-l@scirocco.org>
>Subject: Re: low compression--update
>Date: Sat, 22 Feb 2003 19:07:42 -0500
>
>Mike,
>there are multiple layers to piston rings. it would be a very tough call
>without pulling that piston. also, if a ring did go, it probably
>cracked/snapped/otherwise broke, which usually leaves tell-tale signs on 
>the
>cylinder wall. did you roll the crank and check out the wall of #4?
>Al
>
>----- Original Message -----
>From: "Michael Abatzis" <abatzis2@hotmail.com>
>To: <scirocco-l@scirocco.org>
>Sent: Saturday, February 22, 2003 6:52 PM
>Subject: low compression--update
>
>
> > in an effort to find low compression in my #4 cylinder, i did a leakdown
> > test; heard a leak in the intake manifold (strangely, it was heard best 
>in
> > the #1 pipe). pulled the head. found nothing. lost a head stud washer, 
>so
>i
> > can't clamp it back down till tomorrow, but since i didn't do anything 
>but
> > clean a bit, i can't imagine i fixed anything. i'm kind of at a loss
> > now--would anything that causes a 120 psi (210 vs. 90) difference b/t
> > cylinders be obvious? i would think it would. the differential:
> >
> > head gasket/warped head: i doubt it. the 3 other cylinders were within
>spec,
> > and there has been no coolant loss/mixing. HG looked ok, but it's tough 
>to
> > tell cause it's metal.
> > broken ring: ?? everything looked ok from the outside, but i'm not sure
>what
> > to look for.
> > intake/exhaust valve leak: that's what i'd suspect, but both seemed to
>seat
> > pretty good. didn't see anything that would suggest they were bent.
> >
> > anything else? here are some pix:
> >
> >
>http://www.learnlink.emory.edu/~mabatzi/head%20work/head%20removal%20001.jpg
> >   --this is right after taking head off
> >
>http://www.learnlink.emory.edu/~mabatzi/head%20work/head%20removal%20002.jpg
> >   --close up of #4 piston.
> >
>http://www.learnlink.emory.edu/~mabatzi/head%20work/head%20removal%20003.jpg
> >   --cylinder head
> >
>http://www.learnlink.emory.edu/~mabatzi/head%20work/head%20removal%20004.jpg
> >   --#4 intake valves
> >
>http://www.learnlink.emory.edu/~mabatzi/head%20work/head%20removal%20005.jpg
> >   --valves closed on #4
> >
> >
> >
> >
> > -Michael Abatzis
> > Hotlanta! GA
> > 1988 Scirocco 2L 16v RIP-->parting, finally taking orders:
> > www.learnlink.emory.edu/~mabatzi/mikes_page1.html
> > 1987 Scirocco 2L 16v...
> >
> >
> >
> >
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