Blown Up Ls1????
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Staging Lane
Joined: Oct 2005
Posts: 55
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Blown Up Ls1???? so....i purchased a zex wet kit a few months ago....what a fun time that gave me at the track....with a 125 shot it was doing 7.60's in the 1/8 on street tires....so i got a little greedy and went with a 150 shot.....wow what a difference....only droped a tenth....but it felt great....so right after that run the car was running a litthe rough... i took it home and pulled the plugs (tr6's) and put back in the factory gapped plugs...that that would fix the problem....i totally ignored the slightly rough idle.....i even continued racing all motor on the streets thinking nothing was wrong....so i was bored and did a compression test today(months later) and found only 75psi in cyl3!!!! 150psi in all the others.... so i did a wet compression test to see if it would change anything.... and then compression test results rocked to 115psi....a sign of damanged piston??? rings??? any ideas on what went soo wrong??? i also removed my throttle body and found un usual amounts of oil in the intake.....????
When my motor goes, I hope it goes like that. I want some of my engine parts to be reusable. But besides that, I'm Sorry to hear that, Good luck, I hope it's nothing bad.
Last edited by Oatmeal; Apr 13, 2006 at 05:25 PM.
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Sounds familiar... 
have you changed your oil and inspected for foreign material? The unusual amount of oil in the intake is indicative of extreme blow-by... which is usually a result of broken rings or piston (busted ringland).
I'd go ahead and venture to say you have a broken ringland which has also taken out the rings.
You really need to pull the head to check for scarring of the cylinder wall, and then from there you will have to proceed from there... whether you just pop a new piston in, rebuild the shortblock, or rebuild an entire new shortblock.
have you changed your oil and inspected for foreign material? The unusual amount of oil in the intake is indicative of extreme blow-by... which is usually a result of broken rings or piston (busted ringland).
I'd go ahead and venture to say you have a broken ringland which has also taken out the rings.
You really need to pull the head to check for scarring of the cylinder wall, and then from there you will have to proceed from there... whether you just pop a new piston in, rebuild the shortblock, or rebuild an entire new shortblock.
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Originally Posted by xaon
Sounds familiar...
I'd go ahead and venture to say you have a broken ringland which has also taken out the rings.
.
I'd go ahead and venture to say you have a broken ringland which has also taken out the rings.
.
Hmm, 75PSI.... I'd be happy with that. I did a compression check on my #5 Cylinder and it had 30PSI so I was bummed... Short story long, I pulled almost everything apart and moving it over to my forged bottom end. Sad thing is with that cylinder blown I still made 380 RWHP. Crazy. Same cause... Nitrous. As the quotes say if you wanna spray, you gotta pay.
Originally Posted by 2002LS1Z28
stock fuel pump....i hit the rev limiter though.....not good!!!! on stock timing also....i would invest in a FPSS ...it would have saved me a motor
The stock pump is good to 440-460rwhp. I used to run a 75 shot on my old cam only setup (410rwhp on motor) and it did fine. Then I swapped out to a walbro intank and ran a 200 shot.
