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Nothing over 8k, here is the deal my man. It being harder is the issue. If you have a hardened piece of metal you need to temper it in order for it to be able to have "memory" with out memory it will bend and stay that way. Tempering will soften it in comparison to a non tempered hardened shaft.
Shaft deformation is something that is natural and will happen.
Look, I dont want to brag or try and make my self look great or anything like that I try and stay humble, to help you out let me give you a little background info.
I was trained to build the top racing rotary engines by Paul Yaw of Yawpower. I built all the engines that came out of his shop for the last 6years or so. Paul moved on to motec and injectors so no more engines, He helped Tom and I start azrotaryrockets.
We are also "sponsored" if you will by Mazda, i act as tech support for there rotary team and motor sports team.....
After coming from Yaw Mazda came with us, they send us project and customers, so I would say we know a little about this subject.
So take my word or dont ...I was aiming to help thats all....Good luck.
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