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Old 01-15-2018, 06:22 PM   #1
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LSA Crankshaft Limits

So I️ know the LSA crankshaft is shared with the B15 LSX Block and is a Forged crankshaft. But, has anyone ever broken an LSA crankshaft or know what its limits truly are? Any insight or opinions would be great. Thanks!
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Old 01-15-2018, 07:35 PM   #2
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I'd say if you are running an aluminum block that you will meet the block limits before the crank runs out. LSA crank should be good from 1000hp to 1200hp at the crank, and up to 1500hp if you wanna test your luck.
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Old 01-15-2018, 07:41 PM   #3
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Depending on the tune, 1200hp, it will go further but you will see deflection in the bearings as it starts to flex and bounce around.
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Old 01-15-2018, 08:43 PM   #4
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Quote:
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I'd say if you are running an aluminum block that you will meet the block limits before the crank runs out. LSA crank should be good from 1000hp to 1200hp at the crank, and up to 1500hp if you wanna test your luck.
Thank you.
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Old 01-15-2018, 08:44 PM   #5
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Originally Posted by ZL1C7 View Post
Depending on the tune, 1200hp, it will go further but you will see deflection in the bearings as it starts to flex and bounce around.
Thank you!
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Old 01-16-2018, 12:44 PM   #6
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Inside an original engine LSA, it's good for about 900-1000 crank. In a motor with upgrades; like it looks like you have, it should do 1000-1200 but I must say you'd be pushing the hell out of it and it will start to flex as noted above; I might recommend going to a Callies or something like that.
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Old 01-16-2018, 01:07 PM   #7
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I had 1000 rwhp for three years and my crankshaft held up great. It is/was the pistons that will be the week point......
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Old 01-16-2018, 04:31 PM   #8
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I had 1000 rwhp for three years and my crankshaft held up great. It is/was the pistons that will be the week point......
I'm guessing this one is yours? Sweet build!

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Old 01-18-2018, 11:36 AM   #9
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I'm guessing this one is yours? Sweet build!

Yes Sir ! Thanks......
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