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PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Race > RPM Forged 4.5 Crankshaft
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Old 04-27-2018, 04:55 PM
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77 TRASHCAN 77 TRASHCAN is offline
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Originally Posted by lust4speed View Post
Except that's backwards since a longer rod should have less piston rock. Could have been a build issue not related to rod length at all. I'm running the 6.8 rods and 4.5" stroke in the drag engine, and believe Frank at AP was the one suggesting the length.
Yeah, I know. I believe there were several issues going on in the engine. He didn't talk about it too much, I believe he was not wanting to stir up any controversy, especially towards the builder...

The RPM catalog shows a 6.8 rod for the 3.25 main crank (4.5" stroke), and a 6.7 rod for the 3.00 main crank. I wonder if the counter weights are larger on the 3.25 main version...

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