Thread: Resurfaced Flywheels

common issues with clutches ( such as ACT with adjustability or clutchnet with slipping) are exacerbated by having no step cut in. I had both of these, but my clutchnet improved clamping force considerably and has never slipped since I had the flywheel properly surfaced. IIRC it is a 20 thou ( 0.020 inch) step, but I always let the machine shop guys look it up before. Now I am very curious what it actually was.

You could get the same exact performance of running a step just by making the clutch disk slightly thicker. And I agree, again, that you guys are looking too far into this. The reason the clutch is slipping probably just not enough clutch, like I said.

That website you posted showed that they have a step of about .010", but your clutch disk wears much more than that during its life span. Not to mention most aluminum aftermarket flywheels don't take the step into account as well. Because on our application, it really isn't that important. If it were, wouldn't the FSM have data showing how important it is?

In a way you guys are looking too far into it. However the step is there to give the extra clamping force and not only that, its a wear idicator for how many times your flywheel can be resurfaced. Any good machine shop will know this. Once you grind through the step and the flywheel is flat your not supposed to resurface it anymore. Fidanza flywheels with their friction disk leave a step probably about the same as the factory. The friction plate sticks up just above the PP mounting surface. Again it can make a good amount of difference on both holding capability and the longevity of the clutch before it does start to slip.

During a resurface if the flywheel just has normal wear or slight scoring it should only take between .001-.003 to get rid of it. So realisticly you could resurface the flywheel about 3-4 times before needing replacement.

If your flywheel is flat and no step as long as you have a good clutch it should still hold good power. But again it might start slipping sooner as it wears down because there is no step.