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Straightened crankshaft revisited

General engine tech -- Drag Racing to Circle Track

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Re: Straightened crankshaft revisited

Post by Vintagewrench » Thu Nov 07, 2019 2:07 pm

exhaustgases wrote:
Thu Nov 07, 2019 12:29 am
Vintagewrench wrote:
Tue Nov 05, 2019 2:50 pm

Relax and stretch??? Maybe compressive stress is relaxed when grinding? Doesn't peening cause compressive stress?
Yes, and compressive stress is a better term for it than what I used.
modok wrote:
Thu Nov 07, 2019 12:33 am
You grind out a little of the area you peened, so, it that compressive stress is gone, because that material is gone.
Also the heat of grinding may relax some of the compressive stress also, just slightly, usually only a small amount. A few thou. Half the reason you straighten a crank BEFORE grinding is SO you can grind it.

Both of your statements are correct. I always check it again afterward and then carefully peen again if is necessary after grinding.
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