LS1 studs
What compression ratio were you running at 15psi? Was it the stock ~10.5:1 or were you running a dished piston or larger chamber?
Could cylinder pressure be the source of your failure at 15psi, or is it a different factor?
What kind of failure did you have? Could it have been a bad tune or a defective block? (not a block with an inherent design defect/limitation)
Could cylinder pressure be the source of your failure at 15psi, or is it a different factor?
What kind of failure did you have? Could it have been a bad tune or a defective block? (not a block with an inherent design defect/limitation)
Instead of using a Cometic gasket they used an ordinary GM MLS gasket which I think caused more problems than the sleeve.
I want to get into the 20s. An LS2 should be ok but I think I'll go with either a LSX iron block or an aftermarket aluminum block probably a Warhawk block. I can go into the 30s with the iron block for short periods.
I'm torn between that and just putting the car back together and selling it to get a C6 platform probably Z06.
BTW, several dealers I've talked to cannot sell either a LS2 or LS3 block by itself.
Anyone got a dealer who knows how to procure a LS2 block?
I want to get into the 20s. An LS2 should be ok but I think I'll go with either a LSX iron block or an aftermarket aluminum block probably a Warhawk block. I can go into the 30s with the iron block for short periods.
I'm torn between that and just putting the car back together and selling it to get a C6 platform probably Z06.
BTW, several dealers I've talked to cannot sell either a LS2 or LS3 block by itself.
Anyone got a dealer who knows how to procure a LS2 block?
Thread Starter
Teching In
Joined: Sep 2005
Posts: 17
Likes: 0
What compression ratio were you running at 15psi? Was it the stock ~10.5:1 or were you running a dished piston or larger chamber?
Could cylinder pressure be the source of your failure at 15psi, or is it a different factor?
What kind of failure did you have? Could it have been a bad tune or a defective block? (not a block with an inherent design defect/limitation)
Could cylinder pressure be the source of your failure at 15psi, or is it a different factor?
What kind of failure did you have? Could it have been a bad tune or a defective block? (not a block with an inherent design defect/limitation)
The leak went on for some time just wasn't noticeable to me until it started breaking down on the very top. We thought it was plugs and wires. The fuel started fluxuating at the top (of WOT). Then it let go. Pulled the head and busted sleeve and block.
Many years ago I raced Porsches when turbos were coming in again to racing and production cars (80s). We ran thru a lot of cracked rings and pistons in those days despite the leaded gas with very high octane numbers. Just a boost gauge wasn't much help. Point being with so much power it's hard to tell when you're losing a little power until its obviously something wrong or track times tell you something's up. You'd take the engine down and couldn't believe what you'd find and the car still running fairly strong.
Thread Starter
Teching In
Joined: Sep 2005
Posts: 17
Likes: 0
Sooner or later if you're boosting enough something is going to let go. If you have a LS1 then at near two bar you're going to eventually lift your heads. Probably.
So you blew a hole in the sleve... or it cracked? or scored? or moved in the block? When the block failed, was that related to the failed sleve, or was it a bearing? did the head studs pull the threads out of the aluminum block? How did the block fail?
Any pics? I always love to see FI carnage!
It sounds to me like you have an outlier... maybe you got a bad block or had some other issue. The overwhelming majority of people that take the aluminum block to and past your power level have no issues with the block itself, provided no other extraneous issues.
Any pics? I always love to see FI carnage!
It sounds to me like you have an outlier... maybe you got a bad block or had some other issue. The overwhelming majority of people that take the aluminum block to and past your power level have no issues with the block itself, provided no other extraneous issues.
I'm running a low compression ratio with custom turbo pistons. I believe the gasket failed as three of four cylinders on that side where 'cleaned' by steam. There was no damage to the pistons or rings but one cylinder sleeve failed then eventually the block failed. The gaskets used were ordinary GM MLS gaskets. A Cometic gasket could have failed, too, but I'd have never put plain MLS gaskets on the car. Too much boost even at the 10-15 the car saw.
The leak went on for some time just wasn't noticeable to me until it started breaking down on the very top. We thought it was plugs and wires. The fuel started fluxuating at the top (of WOT). Then it let go. Pulled the head and busted sleeve and block.
The leak went on for some time just wasn't noticeable to me until it started breaking down on the very top. We thought it was plugs and wires. The fuel started fluxuating at the top (of WOT). Then it let go. Pulled the head and busted sleeve and block.
You can still only tighten to 90lbs anyway regardless of what stud size you're running
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you just have your head so far shoved up your *** that you think all the advice you have already been given is gospel...then why ask the questions if you have it all figured out?
Chad
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
listen to Shawn @ VA speed...he knows wtf hes talking about and if you don't think so just look at the motors that are being put together at his shop, Phil's LSX powered mustang w/ a single is a testament to that, as well as Brian's car...ls2 block holding big power on 4 bolt heads.
you just have your head so far shoved up your *** that you think all the advice you have already been given is gospel...then why ask the questions if you have it all figured out?
Chad
you just have your head so far shoved up your *** that you think all the advice you have already been given is gospel...then why ask the questions if you have it all figured out?
Chad
