Ls2 302
We call that "being a parrot." It's one thing to have an opinion, but it's entirely different to spread that opinion as fact. The fact is that a 4" a stroker doesn't need longer sleeves to turn 8k. Look at how many LSX blocks are being used in drag racing and turning 8-10k RPM. The LSX block has the same cylinder length a stock block (except LS7).
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We call that "being a parrot." It's one thing to have an opinion, but it's entirely different to spread that opinion as fact. The fact is that a 4" a stroker doesn't need longer sleeves to turn 8k. Look at how many LSX blocks are being used in drag racing and turning 8-10k RPM. The LSX block has the same cylinder length a stock block (except LS7).
Just because something can be done, doesn't mean i can't bash it not being done like someone who does it daily does. That's my right.
I stated an opinion based on an engine building master's words,
Then explained it wouldn't be optimal for myself!
The School of Automotive Machinists: 4" stroke LSX - 1,001bhp @ 9000RPM
https://ls1tech.com/forums/dynamomet...-1000hp-n.html
Proline: 4" Stroke - 1,029bhp @ 8200RPM
http://www.superchevy.com/how-to/ght...-440ci-na-lsx/
Bischoff Engine Services: 4" Stroke LSX - 8.33 @ 160MPH - 9800RPM Rev Limiter
I'm saying this quote of yours is nonsense:
The LSX block they used has the same cylinder length (~5.5") and deck height (~9.24") as the OEM blocks, with the exception of the LS7. If you're saying you need an LS7 cylinder length to use a 4" stroke or else the pistons are too far out of the bore, then these engine builders I used as an example do not share your opinion. Since they are the fastest all motor LSX cars in the country, I'll take their word.
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guess ls1 tech screwed up by posting morgan's video explaining about lsx's on the front of the website... i mean if what he said is irrelevant than it should have been redacted.... excuse me for using this website as a source of information!
You aren't the only one using LS1Tech as a source of info. This is how a lot of internet BS is spread and why it needs to be debunked. The issues with the piston skirt coming too far out of the bottom of the cylinder at BDC were from poorly designed pistons and poorly assembled/machined engines.
You can sit here all day and say, "so and so said this or said that", but the reality is that some of the fastest all motor LSX engines are using a 4" crank and the shorter OEM cylinder length. There are literally thousands of trouble free 383ci, 408ci, and 416ci strokers out there on the street. Nothing against Morgan and Sons, but what you're saying they said just isn't happening in the real world.
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From: Wilmington, De
Everyone talked about a 302 when the L99 came out making an inexpensive LT1 302 possible. The thing is the lost torque isn't worth it on a street build. Further, if you want to really quickly rev a motor your money is likely better spent on a light weight rotating assembly. I'd be more reading the LS7 rotating assembly topics. As discussed a 4" stroke isn't a problem, and I would think even at 4.125" the bigger trade off would be moving the pin up in the piston and how that impacts ring placement rather than BDC issues.
If you're really hung up on a short stroke rev happy motor, a 331 can be assembled using a crank from a 4.8 for much less than a custom crank. If you do your homework on rods and pistons you may even do it using all off the shelf parts.
If you're really hung up on a short stroke rev happy motor, a 331 can be assembled using a crank from a 4.8 for much less than a custom crank. If you do your homework on rods and pistons you may even do it using all off the shelf parts.
Last edited by 93Polo; Mar 2, 2016 at 09:26 PM.
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From: Wilmington, De
Just like the LT1 302 can be done with the L99 crank and rods and the the LT1 pistons, the 331 can be done with the 4.8 crank and rods and the LS2 pistons. And just like the LT1 302, the LS 331 is met with the same unwarranted cynicism.
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I've always loved the Chevy 302 that came in the original z28. So I thought itd be cool to have a 302 ls. Kinda have a legend for displacement but power potential and reliability of an ls. The original 302 had a 4.00" bore and 3.00" stroke. I thought of starting with the ls2 since it already has the right bore. Does anybody know a good site to order a custom crank for the shortened stroke? And what else would be recomended?
I recently built a short stroke bbc. My 477 made 810hp at 7000 rpm. The same top end on a 540 would have made the same hp at 6000. I would suggest a compromise. Go with a 5.3 crank instead of a 4.8. A 7000 rpm motor is much cheaper to build than an 8000rpm. You don't need shaft rockers, titanium valves etc for 7000, 8000 you do.