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?
British Sportscar Center
----- Original Message -----
From: "Maynard Hirsch" <email@example.com>
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
> that replaces the sparkplug, you use compressed air to pressurize the
> cylinder. (The cylinder should be at the bottom of the downstroke).
> a gauge in the airline. You watch and see if the pressure drops.
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