static cranking pressures - opinions please!
Thread Starter
TECH Enthusiast
Joined: Dec 2003
Posts: 535
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From: Warner Robins, GA
static cranking pressures - opinions please! I'm trying to troubleshoot a miss so I'm starting with the basics.
Plugs look good. Driver's side show just a tad richer than passenger side.
Cranking pressures, engine cold, throttle blade wide open.
1-190 2-210
3-190 4-210
5-190 6-210
7-210 8-210
Mods are in sig. I just recently had the heads off so I could replace lifters and I used stock GM gaskets. I used ARP studs and torqued incrementaly to 65 ft lbs.
I think allowable difference between cylinders is 10%? I'm worried why 1,3, and 5 are lower than the others. I squirted oil in the low cylinders but they didn't come up. Doesn't seem right on an engine with 20k miles.
Any help, ideas or suggestions appreciated.
Plugs look good. Driver's side show just a tad richer than passenger side.
Cranking pressures, engine cold, throttle blade wide open.
1-190 2-210
3-190 4-210
5-190 6-210
7-210 8-210
Mods are in sig. I just recently had the heads off so I could replace lifters and I used stock GM gaskets. I used ARP studs and torqued incrementaly to 65 ft lbs.
I think allowable difference between cylinders is 10%? I'm worried why 1,3, and 5 are lower than the others. I squirted oil in the low cylinders but they didn't come up. Doesn't seem right on an engine with 20k miles.
Any help, ideas or suggestions appreciated.
if you didn't get an increase in compression by squirting oil in the cylinders,then it's probably your valves not seating properly.i will say your compression test looks a lot better than mine.my lowest was 165 and the highest was 205.the others were 180s and 190s.
Thread Starter
TECH Enthusiast
Joined: Dec 2003
Posts: 535
Likes: 0
From: Warner Robins, GA
Originally Posted by 66deuce
if you didn't get an increase in compression by squirting oil in the cylinders,then it's probably your valves not seating properly.i will say your compression test looks a lot better than mine.my lowest was 165 and the highest was 205.the others were 180s and 190s.
Anyone else?
