Quote:
Originally Posted by 25stevem
It’s very easy to tell if a 100% polished out crank is cast or steel.
Drill a shallow 3/16” hole in the the flywheel end of the crank as close as you can get it to the crank centerline.
If the crank is cast you’ll drill out chips, if it’s steel you’ll get long shards.
My bet is since you say it has a center square cheek that it’s a factor nodular iron crank.
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The crank is not 100% polished out. The profiled counterweight is just cut on a lathe. Very shinny.
I did do the drill thing years ago. Scat forged came out as spirals. OEM cast came out very small chips, powder like.
This crank had a bit larger pieces than the PMD cast crank.
I am thinking it started out life as a Eagle cast steel crank since they did not weld up the thrust with Ni rod-wire.