"EE" Crankshaft

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Dave Loving
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"EE" Crankshaft

Post by Dave Loving » Wed Jun 10, 2020 3:19 pm

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

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Re: "EE" Crankshaft

Post by RajoRacer » Wed Jun 10, 2020 3:23 pm

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.

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Re: "EE" Crankshaft

Post by Adam » Wed Jun 10, 2020 5:19 pm

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).

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Re: "EE" Crankshaft

Post by Allan » Wed Jun 10, 2020 9:27 pm

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.

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Re: "EE" Crankshaft

Post by jab35 » Thu Jun 11, 2020 10:51 am

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

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