lt1 boost limit?

[2fast97z]

eh lt1 rods cant handle that much as you can see...they definately hold up for a while though but when they break they do this




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[j0n]

sweet carnage! i stand corrected :smt025

[Colossus]

How much power were you making on the ground? See, the pistons are generally okay as long as you have a good A/F ratio. The rods are almost always the weak link in a powerful stock bottom end car. The cranks are good for a lot more than either the pistons or the rods.

[Rare4thgens]

Originally Posted by Colossus

For the record I'd just like to say that a cast iron block (LT1) is stronger than an aluminum one (LS1). LS1 is a good motor, don't get me wrong, but the LT1 block is stronger. If you want a stronger LS1 style block go with a LQ9 6.0 litre truck block. Its cast iron.

If you opt for the LT1 I reccomend the Corvette engine as it is a four bolt main. If your building the engine get the Camaro/Impala engine and splay it to a four bolt.

If your putting boost to a stock block go with a Procharger kit. With the intercooler option you can push 12 psi to a stock LT1 if I'm not mistaken. Don't do anymore though. With that I would do supporting mods (i.e. headers, intake, etc) but wouldn't go heads and cam. The engine won't like it.

Also a tune can be more conservative and use more fuel and give the engine a longer life. The leaner you go the more power you make but theres a bigger chance you can lean out the engine. Not a huge deal on an naturally aspirated car, hell, not even a problem really. If you lose fuel pressure the engine doesn't care too much. On a boosted vehicle a loss of fuel pressure will immediatly kill the engine, blowing ring lands, melting pistons, and a whole mess of bad things.

The only thing I would worry about on a stock engine would be the rods. If the tune is good your pistons will be fine. The rods on the other hand are the real limiting factor as I understand it. You will break them around 550 hp I do believe.

All good but unless you pick up an LT4, it wasn't a four bolt, even in the Vette (same part numbers even) . Splaying is the way to go. Leaning anything too much is always a prob, it is just exagerated when put on a power adder. It burns valves, pistons, and will pretty much ruin your day. The pistons are hyper-pops, not something I would put in a high power/compression car (which it will be under boost) not to mention the stock crank. None of this stuff is really any good for over 450 crank hp, I wouldn't trust it at 500 unless you never get on it, and then, what's the point other then a piece of paper that says it can?

[z28 justin]

Originally Posted by Rare4thgens

All good but unless you pick up an LT4, it wasn't a four bolt, even in the Vette (same part numbers even) . Splaying is the way to go. Leaning anything too much is always a prob, it is just exagerated when put on a power adder. It burns valves, pistons, and will pretty much ruin your day. The pistons are hyper-pops, not something I would put in a high power/compression car (which it will be under boost) not to mention the stock crank. None of this stuff is really any good for over 450 crank hp, I wouldn't trust it at 500 unless you never get on it, and then, what's the point other then a piece of paper that says it can?

LT4s were not 4 bolts?? Are you positive, every spec I've ever read says they were 4 bolt mains

[Colossus]

I'm pretty sure Corvette engine's were all four bolts.

Yes, leaning out is bad in general, but if you lost fuel pressure for a second under boost you can kiss your engine good bye unlike a naturally aspirated one, which it would take prolonged abuse to kill.

I say a stock LT1 can take at least 500 at the crank. I have a friend doing 488 crank hp on a daily driven Formula. The rods go first. Look at the pictures above.

Detonation is what really kills a motor, at least the pistons. I wouldn't take the stockers past 550 crank but its possible to attain that I think.

[Rare4thgens]

Originally Posted by z28 justin

LT4s were not 4 bolts?? Are you positive, every spec I've ever read says they were 4 bolt mains

no, only the LT4s had 4 bolt mains. I have checked this out several times. The part number for the regular LT1 Vette block was the same as the F-body...

[Colossus]

Then theres a shit load of people with mysterious extra holes and bolts in their Corvettes. :D