New flywheel rule
 

Has NHRA come with a defined breakdown of the rule on flywheels (flexplates) other than all v8 stock and superstock.

Re: New flywheel rule
 

I sure hope they will exempt my lo comp 340 combo, no starter gear ring at all. thanks Glen H

Re: New flywheel rule
 

Hi Glen! NHRA's concern with these flexplates involves the starter ring gear flying apart. Now in the real world where people understand and realize what they're talking about and making rules for, if I need an SFI approved flexplate to ensure that my starter ring gear isn't going to break off and hurt a spectator then you and any other Mopar SHOULD have an SFI approved torque converter!

Re: New flywheel rule
 

Talked to R. Silvy in NHRA tech dept. he said the stock/superstock commitee made the rule for flywheel(ring gear) . He said nothing he can do about it.I can submit a Email to him and he would pass it on .Also by rule book , superstreet is not required to have 29.1 flexplate. That is a 10.90 class. He would not give me any other people to talk to. Not a good system.

Re: New flywheel rule
 

You can run 10.00 and 134 in a bracket car before you need an SFI approved flexplate but I need one in my high 12 second Stocker.
Common sense would dictate that a "safety" ruling such as this would be based on E.T., not Class.

Re: New flywheel rule
 

My point also. What are mopar guys going to do ,the ring gear is part of torque coverter, and I can't find a sfi 29.1 torque converter.

Re: New flywheel rule
 

Buy the adapter that bolts the convertor to the crank that has a sfi 29.1 number? Gray area?

Re: New flywheel rule
 

Mopars don’t rev high enough to break off the starter ring gear!

Re: New flywheel rule
 

and neither does any of my lo/po GM stuff.

Re: New flywheel rule
 

The rule is a Knee Jerk responce to a 1 in a million accident designed to protect them from law suits in the future,. My opinion Rick

Re: New flywheel rule
 

This kinda reminds me of the time Woodro ran into lake in Florida. Surprised they didn't require floatation devise on all.

Re: New flywheel rule
 

Has happened more times then people know, it just finally got seen on TV this year. and it wasn't a super high HP deal. I get around 3-5 calls a year telling me they found part of thier ring gear missing off a welded on ring gear and most of the time it is a SFI flexplate.
You can get a SFI mopar flexplate for $60, But I agree flexplates without ring gears should be excluded.

Re: New flywheel rule
 

I'll put my trust in my 40+ year old OEM stuff!

Re: New flywheel rule
 

I'm checking now to see what is available for my application, that is made in the USA. I refuse to buy Chinese or other imported junk.

Re: New flywheel rule
 

What is the application?

Re: New flywheel rule
 

1984, 305 Chevy with 2 pc RM seal, and 153 teeth. Having a difficult finding something that says made in USA.

Re: New flywheel rule
 

John, have you tried ATI? I recently got one from them and it seems like a very nice piece.

J.R.

Re: New flywheel rule
 

I got a very nice piece from JW performance this year. And they pay contingency!!

Re: New flywheel rule
 

My question is how they are going to enforce this ruling. I would think a GM application would be the easiest to check due to the bottom of the flywheel being in open air. However, some Ford, and I believe all Mopars have a fully enclosed bellhousing. So at the first division races next year are there going to be random checks? Jack it up in the air if you have a GM, and take your starter out if you have a Mopar or Ford to see the sticker? Personally, I'd put more trust in my way out of date Pioneer flexplate that was made in the USA than a new one made from chinesium. I have heard mixed reviews on ATI flexplates with regards to torque converter fitment.

Re: New flywheel rule
 

The only flexplate that I know are made in the USA are

Meziere FP301 (billet, no welded on ring gear)
ATI 915539
JW 93006

All internal balance

Re: New flywheel rule
 

TCI not made in USA?

Re: New flywheel rule
 

Could not fnd on the website where it said flexplates made in the USA.

Re: New flywheel rule
 

Add to the list Reactor Products.

Re: New flywheel rule
 

Hmmm...

Re: New flywheel rule
 

Just Curious? -----------Does anyone know if these will have to be replaced every 3 years ???

Re: New flywheel rule
 

Sure, they have an Sfi exp. date on the tag
If it’s mandatory to have then it will be

Re: New flywheel rule
 

NHRA needs to breakdown and clarify this rule.

Re: New flywheel rule
 

The cert on flexplate is 3 years, Meziere will recert.

Re: New flywheel rule
 

TCI SFI approved billet one piece flexplates IE 399870LW and the adapter flexplates like Ford or Mopar to GM Trans IE 149182 are made in the USA. The stamped steel flexplates IE 399273 are made in Mexico. The TCI flexplates can be ReCertified after inspection.

Re: New flywheel rule
 

Made in the USA billet flexplates fail too.

3 year old Mexiere

https://i.imgur.com/C6P92uWm.jpg

https://i.imgur.com/YkXwpmSm.jpg

Re: New flywheel rule
 

Ed, just out of curiosity how big was the engine that this flexplate was bolted to? HP? RPM??

Re: New flywheel rule
 

648/1300HP, 7600rpm for the past 2 years, 622/1100HP, 7600rpm for year 1

Re: New flywheel rule
 

Thanks Ed, I'm still trying to make a point regarding this change to the existing rule.
Right now, my 301/280HP, 6000rpm engine requires the same flexplate as your engine.
I'm just hoping that by putting it in print somebody at the top will see how ridiculous this rule change is.

Re: New flywheel rule
 

Billy, no one has to buy a meziere billet flex plate, it's a choice, before I did, I ran ATI flexplates since the mid 80s but the answer can't be that your 40, 50, 60 y/o flexplate is still good or the cheap chinese knockoff is acceptable for race cars no matter how slow, how little HP your engine makes.

Re: New flywheel rule
 

JW Performance was great to deal with. I have a Meziere in my bracket car. JW called me back first. I would recommend either one.

Re: New flywheel rule
 

Yes,its rare but billet flexplates can crack. However I have not seen 1 come apart yet.

Re: New flywheel rule
 

well I'm not looking for mine to be the first. It will be replaced before the start of the 2024 season.