Why are websites telling me not to machine the flywheel?

[m_melen]

So I found a bunch of 300ZX N/A clutch parts online to slap onto my RB20DET, and it says in the descriptions that the flywheels shouldn't be machined when replacing the clutch assemblies. Is this a 300ZX thing or are they just totally full of crap?

[mightymurph]

Seems like for best performance you should resurface the fly wheel anyways.

[bignate]

no reason not to resurface the stock flywheel unless its out of spec. You just dont want to try and machine an aftermarket 2pc one.

[LittleDevilCRX]

Resurfacing is fine. Machining can cause serious problems. check this video...
http://www.youtube.com/watch?v=n0TxZFDLa3w
Thats an example of a oem flywheel machined too much, they are known to just blowup. Not sure how much you can shave an oem skyline flywheel safely but I would recommend spending the money on a aftermarket one and potenitally save yourself from a gernade beside your legs. hope that helps.

[Harvey]

damn!! Guy in the CRX is lucky that the pieces of flywheel didn't end up hitting him.

[BrianV8]

there is nothing wrong with machining a flywheel, having said that i would not do it more than once on a stock flywheel if your doing a high hp application

[Skym]

I agree about heavily machining to make stock flywheel lighter. It makes it weaker.

[m_melen]

i just had mine resurfaced when i tore my engine out to clean it up, it was kinda scuffed up. no ridges or anything, so i thought it'd be alright. I won't be shooting for over 400HP until I get a new clutch, I'll get a new flywheel when I do that.