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Raptor · 02-12-2004

My .02

Yes Mitsu cranks are nitrided and turning them will remove it depending on how far you go. This isn't necessarily a bad think considering that by reducing the diameter of the journal you are slowing the speed of contact at the bearing surface. You can have the crank re-nitrided, not sure exactly on the cost, last one I did was a 440 crank and it was around $140 about 18 years ago. It may be worth checking into, the price has probably gone down some since then due to the cost of technology etc.

Reducing bearing surface speed improves reliability at higher RPM and the journals are plenty large enough to handle it without sacrificing any strength.

As far as only going down .010" I don't think that will remove the factory nitride. Somewhere I remember reading it was only in danger at around .020" but don't quote me on that, I definately could be wrong, I am getting old you know.

02-12-2004	#5
Raptor ConArtist Join Date: Oct 2003 Posts: 1,960	My .02 Yes Mitsu cranks are nitrided and turning them will remove it depending on how far you go. This isn't necessarily a bad think considering that by reducing the diameter of the journal you are slowing the speed of contact at the bearing surface. You can have the crank re-nitrided, not sure exactly on the cost, last one I did was a 440 crank and it was around $140 about 18 years ago. It may be worth checking into, the price has probably gone down some since then due to the cost of technology etc. Reducing bearing surface speed improves reliability at higher RPM and the journals are plenty large enough to handle it without sacrificing any strength. As far as only going down .010" I don't think that will remove the factory nitride. Somewhere I remember reading it was only in danger at around .020" but don't quote me on that, I definately could be wrong, I am getting old you know. __________________ Quick Precision Racing, Inc. "Always Raising the Bar!" 651-488-7774