How bad is this flywheel?

My5ABaby · 09-07-2013, 12:23 PM

I'm swapping a TII tranny into my car and have a new ACT 6 puck clutch and Heavy Duty pressure plate. I was going to use the stock flywheel I have but it has some cracks in it and I'm not sure how normal/usable this are. The biggest one is about 3/4" and then there's probably about 10 smaller cracks.

I will be taking the car to the track so the drivetrain will probably get some abuse and see sustained higher rpms.

GySgtFrank · 09-07-2013, 01:07 PM

IMO, if you plan to use a flywheel at high rpm, any cracking or flaws mean that it should be tossed. Having a flywheel come apart and take off your legs is not something that I would care to chance. Some sort of scatter shield would be a good idea as well since you said it will see sustained high rpm use.

My5ABaby · 09-07-2013, 01:18 PM

Thanks for the reply. I currently have my redline set to 7200 so it's a normal redline, I just meant it will be near that a lot. Nothing extravagant like a crazy PP at 13k rpms.

My5ABaby · 09-08-2013, 11:56 AM

Second question, does this look like it can be resurfaced?

Garfinkles Motor Works · 09-08-2013, 08:55 PM

I would not resurface because if you undercut the cracks and it all looks good the heat that has been produced will keep the cracks coming back .Get an after market steel flywheel that is lighter than stock .It will need to be bolted to an automatic tranny counter weight from the same year as the motor so the balance will be correct .This will rev up faster and save the transmission as well .If a flywheel has hot spots I will not have them undercut ,a new part is in order .Cracks are worse .

My5ABaby · 09-13-2013, 04:55 PM

Managed to find a local TII flywheel that didn't appear to have any cracks in it (thanks Charles!).

Here's the before and after of having it resurfaced by Tennessee Clutch and Supply. Worth every penny. The couple brown streaks/marks on the face are just some run off from the cleaning/blasting process and wiped off.

09-07-2013, 01:07 PM	#2
GySgtFrank Professional Stick Poker Join Date: Feb 2011 Location: Stafford, Ks. Posts: 1,012 Rep Power: 16	IMO, if you plan to use a flywheel at high rpm, any cracking or flaws mean that it should be tossed. Having a flywheel come apart and take off your legs is not something that I would care to chance. Some sort of scatter shield would be a good idea as well since you said it will see sustained high rpm use. __________________ 1988 N/A SE 2+2, dead stock and staying that way. 1979 SA22C stock? Not so much. http://rotarycarclub.com/rotary_foru...ad.php?t=15585

09-07-2013, 01:18 PM	#3
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	Thanks for the reply. I currently have my redline set to 7200 so it's a normal redline, I just meant it will be near that a lot. Nothing extravagant like a crazy PP at 13k rpms. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

09-08-2013, 11:56 AM	#4
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	Second question, does this look like it can be resurfaced? __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

09-08-2013, 08:55 PM	#5
Garfinkles Motor Works RCC Contributor Join Date: Mar 2008 Posts: 535 Rep Power: 18	I would not resurface because if you undercut the cracks and it all looks good the heat that has been produced will keep the cracks coming back .Get an after market steel flywheel that is lighter than stock .It will need to be bolted to an automatic tranny counter weight from the same year as the motor so the balance will be correct .This will rev up faster and save the transmission as well .If a flywheel has hot spots I will not have them undercut ,a new part is in order .Cracks are worse .