Brand new, untouched Fidanza flywheel stepped wrong???

[ILLiCliPSE]

I just got my flywheel back from a shop that checked the step on my flywheel. They didnt step it, they just checked it for me. Its a brand new Fidanza flywheel, and their machine reads between .602-.605. I know that RRE and others recommend it to be .610-.612, but thats whats got me confused. Am I screwed? My car goes into the shop Wednesday to get my 2600 and flywheel installed, and I dont want it to be wrong. I dont know how accurate their machine is either, so maybe the flywheel is stepped right, its just reading wrong. What should I do?

 

[wt71gas]

I have sold a lot of these flywheels and never had a problem with fidanzas measurement on the flywheel step. Secondly since Fidanza's machining is pretty decent the step should be whatever measurement and not really in a range. If your flywheel measures different values throughout for the step thats not good either. I might look into a second machine shop opinion

 

[ILLiCliPSE]

Maybe the machine is reading wrong? Id have it checked out somewhere else, but I have no time tomorrow, and the clutch and flywheel are getting installed Wednesday. Ive never heard of a new Fidanza flywheel being out of spec.

 

[DGajre777]

I've heard of new ACT flywheels sometimes being out of spec but never a Fizanda. Try another machine shop, I took my new ACT flywheel to 2 machine shops to check it before I put it on my car.

 

[wt71gas]

Go have it checked out at another shop if at all possible. If not I would venture a guess to say its ok as I have never heard of that EVER before that I know of. It seems like it might just be operator error especially if he gave you a reading like that.

 

[inneedof]

take it to another machine shop and ask them to check the step height right in front of you. They just use a precision measuring depth micrometer. It only takes a minute.

 

[ILLiCliPSE]

UPDATE:

I got it checked by 4 other shops today...2 of them said that it was close to the readings that I got before, and the other 2 said that it was spot on. .612 and .611 in some spots. My buddy Ruben has a digital depth micrometer and it was reading .611-.612 all the way around give or take a thousandth because of the slight surface rust from touching it so much. I think Im going to go ahead and install it. All of the other shops that werent giving me the right numbers were using a mechanical micrometer that just has numbers and lines on it...probably very unaccurate. Id rather trust my buddies digital one.

 

[wt71gas]

Thanks for the follow up. .611 to .612 is a lot better of a measurement and I can see a .001 variance due to some surface imperfections. To be totally honest you should be fine to run it and old school micrometers and depth gauges work just fine as long as the person reading it knows how. Machine work is all about checking yourself a lot and precision measurements. If a shop is not capable of correctly using their tools I would definitely find a different machine shop