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Old 03-25-2007, 07:44 PM
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Connecting Rod Ratings

Is it entirely practical to use particular connecting rods rated to 500 HP in a street driven naturally aspirated 450HP engine that occasionally turns into 600 HP on nitrous... with the engine limited to say 6250 RPM in both cases? For example, this is my setup:

355 sbc, 4 bolt
Forged Eagle crank
Forged SCAT stock replacement rods
Forged Speed Pro pistons (a heavy 610 grams)

From my understanding, connecting rod ratings in particular should at least be listed in terms of RPM, not HP alone. Usually, if not always, the first thing to destroy a rod & its fasteners are tensile stresses, which would be correlated to RPM.
I mean hypothetically couldn't you run stock rods in a 1000 hp engine as long is it was made under say 6000 RPM? Would the corresponding 1000+ ft-lbs ever "bend" even a stock rod? Am I missing something?

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Old 03-25-2007, 08:05 PM
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Here is a little info. More links at bottom. It talks about some of the load forces as RPM increases.

http://www.hotrod.com/techarticles/c...nnecting_rods/
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Old 03-26-2007, 07:19 AM
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I have done it with GM rods but I was using a lighter weight piston.
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