Compression testing help
Registered User
Joined: Apr 2006
Posts: 44
From: corona, ca
Re: Compression testing help
Or you over-revved it and bent a valve.
A rev limiter is a really good thing to have but they aren't perfect.
When you do the leakdown test on the low comp. cylinder, listen for air leaking out. If you hear it in the pipe, exhaust valve. In the airbox, intake valve. From the oil filler cap, bad rings. Take off the radiator cap. If you see bubbles, head gasket or some other leak to the cooling system.
A rev limiter is a really good thing to have but they aren't perfect.
When you do the leakdown test on the low comp. cylinder, listen for air leaking out. If you hear it in the pipe, exhaust valve. In the airbox, intake valve. From the oil filler cap, bad rings. Take off the radiator cap. If you see bubbles, head gasket or some other leak to the cooling system.
Registered User
Joined: Apr 2006
Posts: 44
From: corona, ca
Re: Compression testing help
Originally Posted by martino
valve clearance is just how much the valve opens... if a valve is leaking, its due to damage only. theres nothing you can measure without taking the head off.
150 psi is fine man, usually the normal spec is is like a 20-30psi spread.
if you had any damage to rods/crank youd hear it plain as day
150 psi is fine man, usually the normal spec is is like a 20-30psi spread.
if you had any damage to rods/crank youd hear it plain as day
If it's stuck open for some reason (bent, etc) the clearance will be too large.
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