[RESOLVED] Fidanza flywheel warning

[Alucards_blood]

Just a heads up to anyone who has bought one recently. First off, at the top the the step height where the pressure plate is bolted down to had burrs that measured at .005" tall at ALL the edges of the step (see pic). I know it doesn't mean much since aluminum is pretty soft and when you bolt down that pressure plate it'll probably just deform and you will still (hopefully) maintain proper step height of .608"-.610". I did not take the chance and used a deburring tool and put a nice break on all those corners.

Then I proceeded to check the step height. Sigh of relief because my first reading was .6095" BUT as I continued around the friction surface, I found that it is NOT flat! It was tapered down from the center of the flywheel by a whole .005"! According to RRE and TRE, we should never be any shallower than .608". My flywheel checked at .605" at the point closest to the center and checked in spec near the pressure plate step height. I'm thinking that this flywheel will grab ONLY at the spots checking .605" and will probably slip, wear excessively and possibly ruin transmission synchros.

Please share any success or failure stories when inspecting Fidanza or ACT flywheels. I'm not sure which one to pick but will definitely be calling Fidanza on Monday morning.

[ed1380]

haven't had a single problem with mine. I wouldn't worry about .003. A disk can easily deform that much. And no it won't wear out your syncro's faster
but good job catching the burr, that would actually make a difference, since you only torque it to 15-16ft/lbs

[Sebba]

It will if it fails to disengage properly as a result.

[cyclonekid77]

Ive had a few fidanza aluminum flywheels. Beat the crap out of all of them and never had a problem. Fidanza has awesome customer service too.

[Airsign89]

Hey Robert, where are you on the install? As I mentioned before, since you so graciously helped pull my Trans. I am more then happy to offer a hand to you. I also agree that the FW should be flat at all points, it would certainly make sense that if only portions of it are at proper height, those portions would be under a lot more stress and heat up/warp much more easily. On a side note the cruise is almost in full effect and I may have to head out. -Matthew

[Alucards_blood]

Originally Posted by ed1380

haven't had a single problem with mine. I wouldn't worry about .003. A disk can easily deform that much. And no it won't wear out your syncro's faster
but good job catching the burr, that would actually make a difference, since you only torque it to 15-16ft/lbs

It will according to TRE. http://www.teamrip.com/flywheel_step_height_info.html

Simply put, if the spring plate geometry is fuct up because the flywheel step height is not correct the clutch won't work as good as it should and you'll tear up your synchronizers, so get that flywheel machined correctly.

And Sebba!

Originally Posted by Sebba

It will if it fails to disengage properly as a result.

[ed1380]

I just measured my buddy's old 6 puck act disk that he ran for a couple years. The petals consistently measured .002-.003 larger towards the splines.

[Alucards_blood]

Received an email from Fidanza today about what I thought was an issue.

By the specs that we have between the actual friction plate and the flywheel the final tolerances should be .608 + or - .004 , this does put you within spec on the total, it is at the far end of it but again within. being as close as it reads with the heat build up from regular driving and use of the clutch the expansion alone would put you higher towards the middle of the tolerances.


Dan J.
Fidanza Engineering
Tech and Product support

[ed1380]

Awesome!! now put it on and start boosting