MTFCA Forum

What is the difference between a "EE" Crankshaft and a regular crankshaft?
How are they identified?
What's the advantage, if there is one?
Thanks,
Dave

Metal properties - EE cranks are marked either in the casting between the throws and/or stamped into the snout. Been known to be a superior crank compared to the earlier "diamond" throw crankshafts.

AA cranks are vanadium steel

EE cranks are high carbon steel

AA is more prone to cracks and breakage but less prone to wear.

EE is generally a bit more durable but more susceptible to wear.

Its less likely to find cracks in a used EE crank, but many used EE cranks wear a lot at #3 main and the wear is generally off center, so if the wear there is .007”, the crank usually won’t clean up at -.020” (if the crank grinder is correctly centering off the flange and not the remaining journal).

Just don't rely on an EE crank not being cracked. It should still be tested, and discarded if it fails the test. I had two put away for future use. When tested, both were cracked, either side of third rod journal.

Allan from down under.

And both types are forgings, not just simple castings, correct?