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LS Power!! Twin 76mm Turbo 4.8L 1200HP & still going!!

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Old Jul 18, 2011 | 11:08 PM
  #11  
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That's all great and good but the rest of the drivetrain is gunna explode
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Old Jul 18, 2011 | 11:09 PM
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Originally Posted by black00chev
Im gonna safely assume that this holds true due to having the thickest cylinder walls.



Do it foose... at least see what that single 76 can turn out! Im sure it could handle a pass or two at 20psi lol.

-Due to overall slower piston speeds per rpm.
-The longer connecting rod is cause,for less loading on both itself and the piston.
-Smaller combustion chambers coupled with the shortest stroke create more efficient combustion process.
-The piston has either the or one the thickest ringland out of the ls family.
-Crankshaft is inheritly stronger due to the short stroke while being cast of the same material.
-Less crankshaft deflection once again due to the shorter stroke same material.
I could probably think of more but,I dont think its warranted.

Last edited by SincalT/A; Jul 18, 2011 at 11:15 PM.
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Old Jul 18, 2011 | 11:18 PM
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I just love this. People gape at me when I tell them my truck does what it does with a stock engine. This article only further sets in stone how badass these engines really are. LSX FTW
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Old Jul 18, 2011 | 11:18 PM
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Originally Posted by Bumpers
That's all great and good but the rest of the drivetrain is gunna explode
Exactly,our biggest problem is gettin it to the ground.I mean idk. bout you guys but,the rest of my drivetrain cost more then my blower/motor by a long shot.
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Old Jul 19, 2011 | 08:15 AM
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That is pretty cool. When I first heard about this article I was a little shocked that there was no valve float and no top end problems but I see they did make some mods to the top end of the engine. Cool info, and pretty neat little set-up. I'd like to see what it woulda made with stock intake and non ported heads.
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Old Jul 19, 2011 | 08:18 AM
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I know someone who works at hot-rod, I'm gonna see if I can't get in touch with their tuner and see if he wants to tune my truck on 118 race gas!!
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Old Jul 19, 2011 | 08:38 AM
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Makes me consider harder using this 4.8 I have sitting here as a candidate for a future build. Junkyards are going to really appreciate this article.
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Old Jul 19, 2011 | 09:07 AM
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their wondering why peak power was at 7K RPM with a 228/230 cam? Thats kinda scary since they were still using stock pushrods. awesome none the less.
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Old Jul 19, 2011 | 11:07 AM
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228/230, big stick for a 4.8L. I question why in the world go with a 112 LSA cam though.
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Old Jul 19, 2011 | 01:19 PM
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Originally Posted by foose04
228/230, big stick for a 4.8L. I question why in the world go with a 112 LSA cam though.
Exactly! Just think if they took a few seconds and spec'd out a good cam. You can find a lot of power with the right combo. (not that they needed anymore)

Excellent write up thanks for sharing!

Was there a dyno graph by chance, I'd really like to see the TQ numbers and what rpm ranges they were working in. I'd like to see how much the shorter stroke would have on the low rpm torque production. I'm not a huge fan of high stalls, not what I'd like to drive daily.

Thanks again!
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