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Old 03-02-2010, 11:16 PM   #1
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Stock flywheel weight

Does anyone know for sure how much a stock flywheel weights? I've heard anything from 21 to 25 pounds. I'm going to do my clutch soon, and I'm trying to decide whether I should just turn a stock flywheel or replace it with something lighter.
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Old 03-03-2010, 07:21 PM   #2
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From memory... the last stock 5.0 flywheel I weighed was 23 lbs. The billet steel one I replaced it with was 24 lbs.
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Old 03-03-2010, 09:45 PM   #3
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IIRC my stocker (cobra has the lightened flywheel) was 26lbs.
i also believe the stock GT fly is like 31lbs
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Old 03-04-2010, 12:41 AM   #4
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Quote:
Originally Posted by AdderMk2 View Post
IIRC my stocker (cobra has the lightened flywheel) was 26lbs.
i also believe the stock GT fly is like 31lbs
No way on 5.0. They are nowhere near that heavy.

And the Cobra and the GT have the same flywheel on a 5.0.
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Old 03-04-2010, 07:13 AM   #5
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Originally Posted by Realspeed Dan View Post
And the Cobra and the GT have the same flywheel on a 5.0.
oh how wrong you are
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Old 03-04-2010, 09:02 AM   #6
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Quote:
Originally Posted by Realspeed Dan View Post
And the Cobra and the GT have the same flywheel on a 5.0.
You are incorrect....

Many folks & Mustang Enthusiasts don't know it, however, only the 94-95 Cobras came with a Cobra specific flywheel, which was indeed lighter than any of the prior 79-93 5.0 flywheels AND those found in the 94-95 GT's.

This is FACT and it's stated in all of the 94-95 Cobra Dealer Brochures & any other factual books/literature about the 94-95 Cobras.

There is not only a weight difference, there is a distinct visible difference as well.

The 94-95 Cobra flywheel is no longer available through Ford. It was never available through Ford Racing, it was never reproduced by any other Mustang aftermarket parts supplier and it is NOT the same as the Ford Motorsport/Racing flywheel that is sold through FR, Summit, Jegs, etc...

The only way one can get one of these flywheels (besides being an owner of a 94-95 Cobra) is if any NOS 94-95 Cobra flywheels exist on some Mustang vendor's shelf OR getting it from someone who is parting a 94-95 Cobra. If one does find one, expect to pay a premium for it, as most of the used ones I have seen fetch upwards of $150+...

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Old 03-04-2010, 09:11 AM   #7
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Darn, I gave mine away then at $50...

Yeah there is a very distinct difference.. on a GT flywheel you can just see the counterweight cast into the back side.. on the Cobra it stands out like a sore thumb, there is a lot of material not cast into it. I never weighed them for the difference but my FRPP billet was WAY heavier than my stock Cobra piece.
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Old 03-04-2010, 09:27 AM   #8
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You learn something new every day.

I've only weighed maybe 3 stock 5.0 flywheels over the years. They all weighed 23 pounds. I guess none of them were Cobra flywheels.
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Old 03-04-2010, 12:58 PM   #9
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So, 23 pounds then? Were those fox flywheels or SN95 GT flywheels?
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Old 03-04-2010, 07:37 PM   #10
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We were doing a clutch on a '95 GT today, so I got curious and pulled the flywheel off and put it on the scale. Our shipping scale shows 20.5 lbs.

23 lbs was from memory. I think that was probably the weight of my billet steel flywheel, which I rember as being just a little but heavier than the stock flywheel.
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Old 03-04-2010, 07:39 PM   #11
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Quote:
Originally Posted by ReplicaR View Post
Were those fox flywheels or SN95 GT flywheels?
After I pulled off the 95 GT flywheel I weighed our collection of used fox body flywheels. All 5 flywheels weighed between 20.0 and 20.5 lb.
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Old 03-04-2010, 07:51 PM   #12
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regardless of weight throw an aluminum flywheel on there and watch how much faster the motor revs up, i noticed it instantly when i replaced my stocker with an aluminum flywheel.
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Old 03-04-2010, 07:52 PM   #13
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and for those who really care the cobra flywheel is 2.7 pounds lighter.
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Old 03-08-2010, 07:12 PM   #14
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At this point, I don't think getting a lighter flywheel is the best bang for the buck. I'm pretty sure I'll get better results if I install headers for less money. I don't really have a problem rev matching the gears on the downshift anyway, I was just wondering just how much weight does the aluminum flywheel take off exactly.

Realspeed Dan, thanks for the info, much appreciated.
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Old 03-10-2010, 07:45 PM   #15
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I also thought the GT Flywheel was 23lbs. Maybe I will weight the one I have in the Garage to see lol.

A Fidanza Alum Flywheel I believe is 14lbs. It sure felt half as light as the stock one.
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Old 10-21-2012, 04:37 PM   #16
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Cobra flywheel = 17lbs, just weighed it.
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Old 12-20-2013, 05:25 PM   #17
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How do find out if you have a 28 oz or 50oz flywheel I have a 90gt
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Old 12-20-2013, 07:28 PM   #18
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Quote:
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How do find out if you have a 28 oz or 50oz flywheel I have a 90gt
It'll be a 50 oz assuming its a stock motor
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