LS1TECH - Camaro and Firebird Forum Discussion

LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Dyno Day Disaster

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Old 04-18-2009, 10:24 AM
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oh jesus man that ******* sucks! i hope its just a headgasket and not something worse i feel for you man
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Old 04-18-2009, 10:30 AM
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Originally Posted by SoxXpupPeT
oh jesus man that ******* sucks! i hope its just a headgasket and not something worse i feel for you man
Thanks bro! If it's something major I'm gonna gut the entire motor out and swap in a LS7 with twin turbo
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Old 04-18-2009, 10:40 AM
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If you have an air compressor do a leak down test. You can isolate the issue depending where you "hear" the air escape, i.e. crankcase (rings etc), intake or exhaust (bad VT part), you would also get bubbles in ur coolant if its a headgasket.
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Old 04-18-2009, 10:49 AM
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The other two options that it could be is a bad ring(s) or holes in the pistons(which is unlikely)but we are still getting to the bottom of it
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Old 04-18-2009, 11:11 AM
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Dang bro sorry to hear about that. Curious to see exactly what the cause is.
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Old 04-18-2009, 11:16 AM
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I'm a little suspicious of the head gasket diagnosis too.
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Old 04-18-2009, 11:22 AM
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Originally Posted by zlicious94
The other two options that it could be is a bad ring(s) or holes in the pistons(which is unlikely)but we are still getting to the bottom of it
Yeah thanks for hanging in there with me huffin exhaust fumes all day...lol

Originally Posted by StealthFormula
Dang bro sorry to hear about that. Curious to see exactly what the cause is.
Thanks Stealth! The curiosity is killing me. I just wanna drive it so bad!
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Old 04-18-2009, 11:41 AM
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Originally Posted by Elliott's94Z
Lots of blowby...then shortly after the car doesn't want to stay running
A leakdown test will tell you exactly what's wrong if you want to do that before taking off the heads. My bet is a munched piston or two. Possibly ring lands...
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Old 04-18-2009, 11:45 AM
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Originally Posted by SS RRR
A leakdown test will tell you exactly what's wrong if you want to do that before taking off the heads. My bet is a munched piston or two. Possibly ring lands...
Yeah my luck it probably will be...still hoping for the best.
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Old 04-18-2009, 12:06 PM
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Originally Posted by Elliott's94Z
Thanks bro! If it's something major I'm gonna gut the entire motor out and swap in a LS7 with twin turbo
haha that wouldnt be So bad then if it is something major can i have your heads ?
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Old 04-18-2009, 12:31 PM
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Originally Posted by SoxXpupPeT
haha that wouldnt be So bad then if it is something major can i have your heads ?
Yup I will have a part out sale...LE2 heads, cam, lpp lt's etc etc
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Old 04-18-2009, 01:02 PM
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Originally Posted by Elliott's94Z
Yup I will have a part out sale...LE2 heads, cam, lpp lt's etc etc
i would love the lpp's and heads hopefully its just the gasket haha when are you going to tear her down ?
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Old 04-18-2009, 01:04 PM
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Originally Posted by SoxXpupPeT
i would love the lpp's and heads hopefully its just the gasket haha when are you going to tear her down ?
Hoping to start the tear down next week sometime. Should have some answers here soon.
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Old 04-18-2009, 01:12 PM
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Sorry to hear that man. Good luck and keep us posted
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Old 04-18-2009, 02:04 PM
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Ya it was a shitty day at Toms dyno. Elliots car was putting excessive pressure into the crankcase. We pulled the pcv valve and the thing was puffin' with the cylinder strokes. Hopefully it's not a ringland but if it is, Cody has many LT1 pistons/rods, or even my old complete LT1 shortblock sitting there as a last resort. It's number 5 and 7, so pulling the the piston/rods out the bottom shouldn't be too bad as long as the crank journals and bores look good.

But then again........... if you're ready for an LSX swap I know someone who could help ya out.

Mike
Last edited by Mikey 97Z M6; 04-18-2009 at 03:08 PM.
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Old 04-18-2009, 02:58 PM
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Well.. if it isn't ringlands then it could've been from valve float smacking the pistons and causing some havoc. Did trouble start at high rpm?
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Old 04-18-2009, 03:08 PM
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Originally Posted by SS RRR
Well.. if it isn't ringlands then it could've been from valve float smacking the pistons and causing some havoc. Did trouble start at high rpm?
No. It blew the pcv valve out of the valvecover at 3500 rpm. Didn't go above that on the dyno prior.

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Old 04-18-2009, 03:12 PM
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Bummer! Sorry to hear this E. How much did you drive the car b4 the tune? You may have washed out the rings? Hope its nothing serious!! I would hate to loose ya to the LSx boys!!
Its not valve float if he went with the Patriot springs and Im sure pretty sure he did!
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Old 04-18-2009, 03:13 PM
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Originally Posted by Mikey 97Z M6
Ya it was a shitty day at Toms dyno. Elliots car was putting excessive pressure into the crankcase. We pulled the pcv valve and the thing was puffin' with the cylinder strokes. Hopefully it's not a ringland but if it is, Cody has many LT1 pistons/rods, or even my old complete LT1 shortblock sitting there as a last resort. It's number 5 and 7, so pulling the the piston/rods out the bottom shouldn't be too bad as long as the crank journals and bores look good.

But then again........... if you're ready for an LSX swap I know someone who could help ya out.

Mike
Well if it comes down to big money you can bet your *** that LT motors coming out and a swap will be taking place. There might be a BIG parts sale going down here..but I'm hoping for the best
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Old 04-18-2009, 03:15 PM
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Originally Posted by AChotrod
Bummer! Sorry to hear this E. How much did you drive the car b4 the tune? You may have washed out the rings? Hope its nothing serious!! I would hate to loose ya to the LSx boys!!
Its not valve float if he went with the Patriot springs and Im sure pretty sure he did!
No Patriot springs...Comp Cams. I drove the car a little, but only because I had too.
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