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Re: Compression test on non running engines

To: "Maynard Hirsch" <mghirsch@netzero.net>, <mgs@autox.team.net>
Subject: Re: Compression test on non running engines
From: "Lawrie Alexander" <Lawrie@britcars.com>
Date: Fri, 29 Mar 2002 23:52:33 -0800
Hmmm, a long time ago I was taught that bleed-down tests (often called
leak-down tests) should be done with the piston at the top of its stroke and
both valves closed (i.e. at the top of the compression stroke).  Anyone care
to confirm which is the correct method?

Lawrie
British Sportscar Center

----- Original Message -----
From: "Maynard Hirsch" <mghirsch@netzero.net>
To: <mgs@autox.team.net>
Sent: Saturday, March 30, 2002 7:03 AM
Subject: RE: Compression test on non running engines


> If you have the equipment, you can do a bleed-down test.  Through a
fitting
> that replaces the sparkplug, you use compressed air to pressurize the
> cylinder.  (The cylinder should be at the bottom of the downstroke).
There is
> a gauge in the airline.  You watch and see if the pressure drops.

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