Grinding a cast 3.48" crank to 2.00" rod journal?

General engine tech -- Drag Racing to Circle Track

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Walter R. Malik
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Re: Grinding a cast 3.48" crank to 2.00" rod journal?

Post by Walter R. Malik »

rustbucket79 wrote: Sat Oct 09, 2021 11:44 pm
Raybo wrote: Fri Oct 08, 2021 5:55 pm only grinding rod journal. These are stock replacement eagle or scat cast cranks.
I’ve had 3 broken cast replacement cranks from one of those companies, all were dirt oval applications. Do not go down this path. I would use a GM crank, not sure you’ll find a gain, sure you should have the crank magnafluxed every season.
YES ... the cranks I used were all "442" Chevrolet cranks.
Not worth much noticeable power but, smaller journals also have less oil "throw-off" in the crankcase.

For those who wonder, I wouldn't go to this small of a journal with engines which make more than about 450/475 lb/ft of torque,
these engines don't.
http://www.rmcompetition.com
Specialty engine building at its finest.
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Re: Grinding a cast 3.48" crank to 2.00" rod journal?

Post by rustbucket79 »

The real benefit I see grinding the rods down .100” is the ability to stroke and index grind the crank to blueprint, and to the limit of the rule book.
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Re: Grinding a cast 3.48" crank to 2.00" rod journal?

Post by levisnteeshirt »

Used to be a few 3.562 stroke cranks made out of em too
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Re: Grinding a cast 3.48" crank to 2.00" rod journal?

Post by Raybo »

Scat and Eagle stuff isnt available right now. I found 3 brand new chevy crate engines. Cranks in these say they are nodular iron. One is going in a R&D engine for the winter to do some dyno work.
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