Nitrous limits on using non-filled LQ9 block
Nitrous limits on using non-filled LQ9 block I have a LQ9 block that is not filled. 4.030 bore for 408ci. I'm curious the nitrous limits on this block. On a 400 shot its around 1,050hp on the engine dyno. How far can I push it before the block fails? 1,150hp gonna be ok if I spray more? What are you guys hitting these things with on a stock block?
I ran my old 6.0 iron set up with a single 87 jet... Which is quite a bit less than 400....
I got the block from summit back when they were selling them for $700.
Biggest issue I had was keeping the bores squared. I tried jetting to a 93 jet, and no matter where I was on timing the engine just wasn't happy. With 87 jets it would maintain 12-14" of pan vacuum. Up the jet to 93 and pan vacuum was erratic and losing. Pistons came out with a small amount of skirt scuffing. This tells me that the block was moving a bit, and rings were losing seal, or poor machine work...
Also remember that it is not necessirily a horsepower issue but more of a load issue. A light car will behave differently than a heavy car with identical engine and tunes.
I got the block from summit back when they were selling them for $700.
Biggest issue I had was keeping the bores squared. I tried jetting to a 93 jet, and no matter where I was on timing the engine just wasn't happy. With 87 jets it would maintain 12-14" of pan vacuum. Up the jet to 93 and pan vacuum was erratic and losing. Pistons came out with a small amount of skirt scuffing. This tells me that the block was moving a bit, and rings were losing seal, or poor machine work...
Also remember that it is not necessirily a horsepower issue but more of a load issue. A light car will behave differently than a heavy car with identical engine and tunes.
I know of one that has been run for over two years and 100+ passes on a .040 jet fogger and zero issues. Everything looked great on recent refresh. No block fill. An engine plate will help a lot with block movement.
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Biggest issue I had was keeping the bores squared. I tried jetting to a 93 jet, and no matter where I was on timing the engine just wasn't happy. With 87 jets it would maintain 12-14" of pan vacuum. Up the jet to 93 and pan vacuum was erratic and losing. Pistons came out with a small amount of skirt scuffing. This tells me that the block was moving a bit, and rings were losing seal, or poor machine work...
Also remember that it is not necessirily a horsepower issue but more of a load issue. A light car will behave differently than a heavy car with identical engine and tunes.
Also remember that it is not necessirily a horsepower issue but more of a load issue. A light car will behave differently than a heavy car with identical engine and tunes.
I'm curious to see how an LSX block will hold up.
I've only see one LQ9 block crack and that was on a Turbo setup.