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Re rolling crank radii

General engine tech -- Drag Racing to Circle Track

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AC sports
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Re rolling crank radii

Post by AC sports » Wed Nov 06, 2019 5:52 am

For the crank grinders here.
Assuming a crank is ground and the radius gets eaten up.
What is the correct procedure for re rolling it?
Is it a grinding process with special narrow stone or a lath turning process with scallop cutter or is it done otherwise?

Momus
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Re: Re rolling crank radii

Post by Momus » Wed Nov 06, 2019 8:39 am

Crank radius rolling is a compressive process using very high forces through hardened steel roller and as far as I know confined to use by high volume manufacturers. Regrinding radii is part of the reconditioning process and is done with a radius ground on a abrasive wheel. In your case it is likely the journal diameter and the radius will have to be redone. I'd suggest taking it to a crankshaft grinder for his expert opinion.

Walter R. Malik
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Re: Re rolling crank radii

Post by Walter R. Malik » Wed Nov 06, 2019 10:00 am

I don't know of anywhere in the country who re-rolls crankshaft radii.

That is a strengthining method though compression of the metal and once it is compressed in the radii, the journal can be ground to the depth of the initial compression without lessening that strength.
Similar to rolling threads instead of cutting them.
http://www.rmcompetition.com
Specialty engine building at its finest.

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