[Vwdiesel] compression test

mikitka mikitka at embarqmail.com
Fri Sep 4 17:09:49 PDT 2009

Yes it would have shown it if the valve was not closing all the way. A
cylinder leak down test is more accurate to show cylinder health.


-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of brian gochnauer
Sent: Thursday, September 03, 2009 9:48 PM
To: vwdiesel at vwfans.com
Subject: [Vwdiesel] compression test

Looking for response with those who have actually done engine issues with a
compression test.
My son has a 5.7L (350cu.) Vortec GM gas engine that he did a compression
test on, some one had said that they
had similar symptoms (ruff running intermittently when completely warmed up)
and after removing their cyl. heads found
a they had found a bent valve on #4 cylinder (only slightly, I'd guess),
they didn't say whether they had done a compression test or not.

We have done a compression test all cylinders at 148 to 155 psi, I'm
thinking the mechanical have to be GOOD.
My question is;
IF THERE IS a bent (bad) valve in THIS engine the compression test would
have shown low compression, wouldn't it ?

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