Honda/Acura Tech Honda tech discussion.

LS crank in a GSR for boost?

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Old Dec 30, 2004 | 10:41 AM
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just wondering b/c i have a knifedged ls crank laying around. but as far as weakness the crank has seen 10k+ rpm multiple times no problems but hey....

anyhow thanks for your input before i got tearing shit apart
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Old Dec 30, 2004 | 03:46 PM
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To me it's a waste of a GSR block to put an LS crank in it. Thats just me and i need to turn at least 9k in the point im at. The rod ratio is not made for high rpm's. Thats why you need those ARP rod Bolts. If it were me i would have bought an aftermaket crank if i couldnt find a GSR/TypeR crank. I'm sure it will work just fine but i wouldnt rev it to 8,500. I think 8k is enough. Anything more and you will have bearing trouble.
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Old Dec 30, 2004 | 06:53 PM
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Originally posted by smoke3
dont have to balance oem stuff
wrong. Balancing a engine makes for a quieter ride, less stress, reduces vibration crankshaft harmonics and increases longetivity to the motor. I don't see why this would be overlooked on a built motor.

Last edited by crx1.8; Dec 30, 2004 at 06:58 PM.
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Old Dec 30, 2004 | 07:05 PM
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Originally posted by qitstrn
To me it's a waste of a GSR block to put an LS crank in it. Thats just me and i need to turn at least 9k in the point im at. The rod ratio is not made for high rpm's. Thats why you need those ARP rod Bolts. If it were me i would have bought an aftermaket crank if i couldnt find a GSR/TypeR crank. I'm sure it will work just fine but i wouldnt rev it to 8,500. I think 8k is enough. Anything more and you will have bearing trouble.
the r/s of an LS is not far from a GSR. an LS crank will spin to 9000 in a gsr block. if its built right bearings will not be an issue at 8500+ even if it were an LS block .
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Old Jan 2, 2005 | 04:57 AM
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Originally posted by Cronic
Yeah, as MTBER said... the stroke is slightly longer on the B18B then the C motors.

B18B rods - 3.504" , R/S: 1.571
B18C rods - 3.433", R/S 1.581

Very minimal difference.

The GSR rods/piston combo will be able to revslightly more and make hp higher in the rpm band. However the LS rods/piston combo will make slightly more tq and will be able to rev slightly lower.
i was always under the impression that the LS rod/stroke ratio is 1.54
89mm stroke, 137mm rods. 137/89 = ~1.54
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