How much HP can stock rods and crank take?
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Senior Member
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Joined: Nov 1999
Posts: 893
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From: Hayward, CA
Car: 91 camaro
Engine: 383
Transmission: T56
How much HP can stock rods and crank take?
Here's the setup on my engine's bottom end:
forged pistons
ARP rod bolts
ARP studs in the mains
stock crank .010 under
stock rods
completely balanced assembly
How much HP can this setup take? I'm sure my engine combo isn't gonna make over 400, I'm estimating more like 350. But if I decide to squeeze it will I blow the bottom end out? Or will I be OK just so long as I don't spin it too fast?
Whoops, forgot to add, it's a 2-bolt.
[This message has been edited by ViciousZ (edited October 19, 2001).]
forged pistons
ARP rod bolts
ARP studs in the mains
stock crank .010 under
stock rods
completely balanced assembly
How much HP can this setup take? I'm sure my engine combo isn't gonna make over 400, I'm estimating more like 350. But if I decide to squeeze it will I blow the bottom end out? Or will I be OK just so long as I don't spin it too fast?
Whoops, forgot to add, it's a 2-bolt.
[This message has been edited by ViciousZ (edited October 19, 2001).]
Supreme Member
Joined: Aug 1999
Posts: 1,443
Likes: 0
From: College Station, Tex USA
Car: 89rs
Engine: 400Sb
Transmission: Tremec 3550
the main cause for rod/bearing failure is loss of oil flow. The bearing overheats and melts. The oil flow can be lost because the nut backs off, the rod side clearance too high or bc the bearing lost the oil wedge due to clearance. Maintain the oil flow and all else will fix itself.
I have seen stock rods live at 6500+ untouched except for bolts.
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89rs 400sb 4.10 gear and a few aluminum things
[This message has been edited by jcb999 (edited October 19, 2001).]
I have seen stock rods live at 6500+ untouched except for bolts.
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89rs 400sb 4.10 gear and a few aluminum things
[This message has been edited by jcb999 (edited October 19, 2001).]
Supreme Member
Joined: Sep 1999
Posts: 7,072
Likes: 13
From: Philly, PA
Assuming perfect clearances on everything (and that's the REAL key to making the bottom end live- FAR more so than having trick aftermarket forge parts) I'll say you're good for 6500 RPM (occasional blasts to 6800) and roughly 500HP.
Remember it's RPMs that kill bottom ends, not torque.
Remember it's RPMs that kill bottom ends, not torque.
TGO Supporter
Joined: Aug 1999
Posts: 14,811
Likes: 1
From: Jackson County
run good bolts, ARPs, polish and blueprint the crank, chamfer the oil holes, run a good pump, M55 w/#26 mr gasket spring and you should be good for 400 and more HP.
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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
Supreme Member
Joined: Mar 2001
Posts: 1,346
Likes: 2
From: Monticello, IN USA
Car: 1991 Z-28
Engine: 350
Transmission: T-5 (gonna buy the farm)
I agree whole heartidly with Damon. RPM kills a motor, not power. Make sure you use good fasteners, and get the clearances correct and your good to go. I would even go as far as 7500 if the bottom end was balanced. My Camaro has seen 6700 and the bottom end is all stock except for pistons.
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Joshua Johnston
1991 Z-28
350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust, Dynomax Bullet Mufflers, T&R Motorsports custom air intake, Bald tires
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Joshua Johnston
1991 Z-28
350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust, Dynomax Bullet Mufflers, T&R Motorsports custom air intake, Bald tires
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