Compression check done on my boosted motor!
06-30-2003, 09:58 PM
#1
0.5 BAR
Thread Starter
Join Date: Dec 2002
Posts: 93
Compression check done on my boosted motor!
Car: 99 stock si 50K miles
T3 turbo 9psi, intercooled, VAFC (-37 across the board), fuel pressure at 40psi idle, DSM 450cc injectors
ok, about 3 or 4 weeks ago at the track I was racing, and the car kinda shutoff at 7K RPMs after my second run. Hmm.... so i took it home and examined the plugs. All were good except plug number 2. It was loose! Well I replaced the set and called it good. Problem solved, no smoking, all is A O K.
Fast forward 2 weeks. Ok so I richened up the fuel with my VAFC because I believe I was leanin out at the track. Later, I painted my valve cover and realized that I forgot a spark plug tube seal and car was blowing out blue smoke Cylinder 1 spark plug hole full of oil. So I fixed that problem, and while I was at it, I did a compression check 210-200-170-200. Cylinder 2, the same cylinder that had the loose plug appears to have lost compression. (Yes, throttle plate was open when I did the test). I put in some oil in the cylinder and did the check again and compression shot up to over 300 psi. I assume the rings in that Cylinder are starting to poop out. Car is blowing smoke. After driving a while, and if i pull into a gas station, turn car off, gas, and start it back up, a bunch of smoke comes out
I am gonna go ***** out and replace the rings, but I was just thinking, I have not adjusted my valves on this motor yet. Could out of spec valves possibly help MY situation? Or because compression shot up with that oil its obviously the rings?
T3 turbo 9psi, intercooled, VAFC (-37 across the board), fuel pressure at 40psi idle, DSM 450cc injectors
ok, about 3 or 4 weeks ago at the track I was racing, and the car kinda shutoff at 7K RPMs after my second run. Hmm.... so i took it home and examined the plugs. All were good except plug number 2. It was loose! Well I replaced the set and called it good. Problem solved, no smoking, all is A O K.
Fast forward 2 weeks. Ok so I richened up the fuel with my VAFC because I believe I was leanin out at the track. Later, I painted my valve cover and realized that I forgot a spark plug tube seal and car was blowing out blue smoke Cylinder 1 spark plug hole full of oil. So I fixed that problem, and while I was at it, I did a compression check 210-200-170-200. Cylinder 2, the same cylinder that had the loose plug appears to have lost compression. (Yes, throttle plate was open when I did the test). I put in some oil in the cylinder and did the check again and compression shot up to over 300 psi. I assume the rings in that Cylinder are starting to poop out. Car is blowing smoke. After driving a while, and if i pull into a gas station, turn car off, gas, and start it back up, a bunch of smoke comes out
I am gonna go ***** out and replace the rings, but I was just thinking, I have not adjusted my valves on this motor yet. Could out of spec valves possibly help MY situation? Or because compression shot up with that oil its obviously the rings?
06-30-2003, 10:07 PM
#2
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:Compression check done on my boosted motor!
Or because compression shot up with that oil its obviously the rings?
That's what I would say.
Sorry to hear it. __________________
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