Compression test results... burning oil
Thread Starter
Le Mans Master
Joined: Jun 2002
Posts: 8,352
Likes: 103
From: In the pit, trying to love someone.
Compression test results... burning oil
Passenger side
Front - 175-180ish
middle front - 170-175ish couldnt get tester real tight on this one dipstick was kinda in the way
middle rear - 175-180 ish
rear - 180ish
Drivers side
Front - 170 - 175ish
middle front - 180 - 185ish
middle rear - 178 - 179
rear - 182 183
Not bad, I was kinda hoping it would be a little better, but with 39K miles I would say its pretty good. There was 1 low one on each side, the passenger side 2nd one back because I couldn't get a good grip and tighten the thing, and the front one on the drivers side because I'm lazy and didn't feel like pulling the alternator to get a real good grip on the thing. I'm satisfied with the results, now to figure out why I'm burning oil. Gonna change my valve stem seals too. I was thinking of coverting to an LS6 PCV system, but I have a catch can with an inline filter after the can to catch vapors, and there isn't much in there so I don't really think that's my problem.
Front - 175-180ish
middle front - 170-175ish couldnt get tester real tight on this one dipstick was kinda in the way
middle rear - 175-180 ish
rear - 180ish
Drivers side
Front - 170 - 175ish
middle front - 180 - 185ish
middle rear - 178 - 179
rear - 182 183
Not bad, I was kinda hoping it would be a little better, but with 39K miles I would say its pretty good. There was 1 low one on each side, the passenger side 2nd one back because I couldn't get a good grip and tighten the thing, and the front one on the drivers side because I'm lazy and didn't feel like pulling the alternator to get a real good grip on the thing. I'm satisfied with the results, now to figure out why I'm burning oil. Gonna change my valve stem seals too. I was thinking of coverting to an LS6 PCV system, but I have a catch can with an inline filter after the can to catch vapors, and there isn't much in there so I don't really think that's my problem.
Racer
Joined: Dec 2005
Posts: 321
Likes: 3
From: bloomington Indiana
I think that you can still have good compression but if the oil control rings/scrapers "flutter" or the oil ring groove is too wide, oil will bypass up to the combustion chamber.
1st & 2nd ring grooves are "angled" (conical) for better sealing during the compression/power stroke so they're not ideal for oil control.
Excessive piston to bore clearance will cause the piston to "rock". Try to make a "round" ring fit a eliptical bore.
1st & 2nd ring grooves are "angled" (conical) for better sealing during the compression/power stroke so they're not ideal for oil control.
Excessive piston to bore clearance will cause the piston to "rock". Try to make a "round" ring fit a eliptical bore.
Thread Starter
Le Mans Master
Joined: Jun 2002
Posts: 8,352
Likes: 103
From: In the pit, trying to love someone.
No, I'm retarded and when I assembled my heads with my PRC duals from Texas Speed I did not push the stem seals on all the way. I've changed 4 so far, and the ones I removed I was able to pop off with my fingers. I'm using a 10mm socket and hammering these puppies down, hopefully that will take care of the issue!
