Inliners International Forums General Discussion Engines 292 Crankshaft Run Out Spec

I am looking for the Run Out Spec for a crank on a 292 Chevy. Please help me out

Run out where?
Nose?
Flange?

Run out is usually refering to something that is bent or warped. Is that what your meaning.

I think he is talking about crankshaft end play?

MBHD

The run out is to see if the crank is bent or not. I measured .002 run out. Seeing that the crank is so long I didn't know if that is out of spec or not

Run out where?
Nose?
Flange?

Run Out at the middle of the crank. Main Journal #3

If its a freshly ground crank, its should be zero....or whoever ground it didn't do very good! On a crank thats been laying around and your considering using it, but not regrinding it, only polishing it, the runout should still be very little, anything more than a .001 in my opinion would be too much.

A fellow engineer who took a performance engine building class at MoTech, Chrysler's educational arm to the automotive trades, said the instructor said crank runout can be significant without any operational issues. He cited hemi cranks as having .006 - .009 tir without any problems. He said under loads the crank will conform to the journals.

This is fourth-hane info so take it with a grain of salt. That seems like more than I would want but that is what he said would still work.

In Smokey's book he said cast cranks move around in the motor quite a bit and not to get wrapped around the axle on this. Set the crank horizontal with blocks on the very ends of the crank with the high side up and it will be runout the other direction before too long. Don't sweat it.