'01 LS6 Tear Down - Piston Damage (pics)
Thread Starter
Racer
Joined: Sep 2006
Posts: 424
Likes: 25
From: Central VA
'01 LS6 Tear Down - Piston Damage (pics)
https://www.corvetteforum.com/forums...post1588684944
Please take a look at my thread here and offer any advice on engine rebuild. Thanks!
Please take a look at my thread here and offer any advice on engine rebuild. Thanks!
Melting Slicks
Joined: Jun 2005
Posts: 2,396
Likes: 52
From: Sicamous BC
https://www.corvetteforum.com/forums...post1588684944
Please take a look at my thread here and offer any advice on engine rebuild. Thanks!
Please take a look at my thread here and offer any advice on engine rebuild. Thanks!
I did a lot searching when my #7 passed, everything from a lean cylinder to the steam building up in the cooling system. The post that sticks in my mind was from Kurt Urban when he was involved with the Motorola cars. They were losing that cylinder so he had one on the dyno with EGT's & AFR on each cylinder, no way could they make that cylinder fail or find reason. This part I'm not sure how it came about, there was a fuel change to higher octane & the problem went away.
Racer
Joined: Feb 2014
Posts: 328
Likes: 0
From: South River NJ
That was pretty good damage for a non-power adder engine. That piston looked like a typical nitrous "Oops"......... Usually detonation will let oil get into the chamber which lowers the octane which lets the detonation go-wild and hence, a melt-down. A vacuum gauge in the crankcase (like hooked to a valve cover) will instantly show a piston(s) no longer sealing. Been there done that on a nitrous race engine and that vacuum gauge saved me a LOT of money! Good luck with the rebuild.
Thread Starter
Racer
Joined: Sep 2006
Posts: 424
Likes: 25
From: Central VA
Thank you for the replies so far!
Anybody have an opinion on the need to hone the cylinder bore of #7 (you can see a wear pattern, but can't feel anything)
Do I need to pull the main bearings given the wear in the motor?
Anybody have an opinion on the need to hone the cylinder bore of #7 (you can see a wear pattern, but can't feel anything)
Do I need to pull the main bearings given the wear in the motor?
Safety Car
Joined: Aug 2011
Posts: 4,449
Likes: 409
From: Portland OR
I'm going to say that #7 will need a hone and oversize piston. Although you wouldn't know for sure until you have a machine shop measure it.
I honestly think your best bet given the fact that you road race the car would be to rebuild it with forged Pistons and rods.
It's not horribly expensive and there are good parts available.
Talk to Martin at Tic Performance.
You could go budget and just hone with a replacement piston and rings in #7. Leave the rest of the Pistons and rings alone. Risky though for your kind of racing.
When done, have it tuned, then subtract a couple deg of timing and Richen the mix a tad.
And yes, you need to have a look at the main bearings.
Ron
I honestly think your best bet given the fact that you road race the car would be to rebuild it with forged Pistons and rods.
It's not horribly expensive and there are good parts available.
Talk to Martin at Tic Performance.
You could go budget and just hone with a replacement piston and rings in #7. Leave the rest of the Pistons and rings alone. Risky though for your kind of racing.
When done, have it tuned, then subtract a couple deg of timing and Richen the mix a tad.
And yes, you need to have a look at the main bearings.
Ron
