comperssion test question???

show95stang · October 12th, 2008, 01:15 AM

hey guys heres the deal ,the guy who owned my car before me had nitrous on it...and i think the insides might be bad because the car runs clean but it doesnt perform the way i think it should.so monday im gunna do a compression test and i was wondering if the readings come out bad does that mean my internals are fried???

r.barn · October 12th, 2008, 09:48 AM

A compression test will tell you how well the engine
is building pressure while moving.

A better test is a leak down test which test the static sealing
of the rings and valves with the engine at rest.

Worn out engine can still make pressure, but leak down test will
tell you how well the rings are actually sealing.

If bad compression test, it means your rings are fried or your
valves are sticking open.

October 12th, 2008, 01:15 AM	#1
show95stang Regular Join Date: Nov 2007 Posts: 83 iTrader: 0 reviews	comperssion test question??? hey guys heres the deal ,the guy who owned my car before me had nitrous on it...and i think the insides might be bad because the car runs clean but it doesnt perform the way i think it should.so monday im gunna do a compression test and i was wondering if the readings come out bad does that mean my internals are fried??? __________________ -Full intake -Full exhaust -Rockers -Cam -Upper and lower intake manifold -Nittos DRs

October 12th, 2008, 09:48 AM	#2
r.barn Regular 1989 LX Vert - 1993 Notch Fast Join Date: May 2008 Location: Houston Posts: 398 iTrader: 0 reviews	A compression test will tell you how well the engine is building pressure while moving. A better test is a leak down test which test the static sealing of the rings and valves with the engine at rest. Worn out engine can still make pressure, but leak down test will tell you how well the rings are actually sealing. If bad compression test, it means your rings are fried or your valves are sticking open. __________________ The last President elected in anger of previous President was ....... Jimmy Carter God Help Us

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