Help Please. Motor with low / No compression
Thread Starter
Teching In
Joined: Nov 2007
Posts: 4
Likes: 0
Help Please. Motor with low / No compression All,
So I have a 99 Corvette with an LS2 bottom end (Forged pistons, etc) and LS3 heads. The car also has a 150 nitrous shot. I just got the car a few days ago. Did a few pulls NA, no problems, decided to do a pull with the nitrous and as soon as I hit it, the motor shut off. Had the death "No compression" crank. So when I get it back to the shop, I do a compression test and 5 of the cylinders have 0 compression, 2 have very little, and one is over 100psi. The plugs that were pulled out looked PERFECT. Im having a hard time believing it melted all the pistons with less than 0.5 sec nitrous pull, so Im curious if it could be something cam timing related. Im not very familiar with the LS series engines, so I thought I would look for some input. I am going to try to get a bore scope to check pistons later this week, just curious if there is anything else I need to look for?
I know Im being kind of vague, but the car is professionally built and tuned (Jeremy Formato old personal car) , just speculating if there is another weak point out there.
Performance Mods
Cam-231/239 617/623 114+4
VaraRam CAI
Ported LS3 TB (Formato)
Ported LS3 Intake (Formato)
Ported LS3 Heads (Formato)
ZR1 52lb injectors
Forged Mahle Pistons
364ci 6L LS2 block
Any help is very appreciated.
So I have a 99 Corvette with an LS2 bottom end (Forged pistons, etc) and LS3 heads. The car also has a 150 nitrous shot. I just got the car a few days ago. Did a few pulls NA, no problems, decided to do a pull with the nitrous and as soon as I hit it, the motor shut off. Had the death "No compression" crank. So when I get it back to the shop, I do a compression test and 5 of the cylinders have 0 compression, 2 have very little, and one is over 100psi. The plugs that were pulled out looked PERFECT. Im having a hard time believing it melted all the pistons with less than 0.5 sec nitrous pull, so Im curious if it could be something cam timing related. Im not very familiar with the LS series engines, so I thought I would look for some input. I am going to try to get a bore scope to check pistons later this week, just curious if there is anything else I need to look for?
I know Im being kind of vague, but the car is professionally built and tuned (Jeremy Formato old personal car) , just speculating if there is another weak point out there.
Performance Mods
Cam-231/239 617/623 114+4
VaraRam CAI
Ported LS3 TB (Formato)
Ported LS3 Intake (Formato)
Ported LS3 Heads (Formato)
ZR1 52lb injectors
Forged Mahle Pistons
364ci 6L LS2 block
Any help is very appreciated.
Thread Starter
Teching In
Joined: Nov 2007
Posts: 4
Likes: 0
So, I pulled a valve cover today and cranked the motor. NONE of the valve train moved. So Im not sure what could have broke. I dont think the timing chain broke, or I would hear it banging around. So could the key way in the crank have broken, camshaft, Gear?? Any common issues related to this on these motors? Anyone?
Thanks
TIM
Thanks
TIM
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