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07-04-2006, 09:48 PM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
Which Aluminum Flywheel
I will be getting an aluminum flywheel for my car shortly. Need a 157 tooth 28oz for a worked 302 (carb)
I am between Ram and Fidanza. Does anyone know any pro's or con's on either?
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07-05-2006, 12:59 AM
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CC Member
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Join Date: Jun 2003
Cobra Make, Engine: ERA 427 w/496 Side Oiler, roller, dual quads
Posts: 417
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Not Ranked
It depends on your low gear and final drive ratios, but in most cases you're better off with an iron flywheel. The problem is an aluminum flywheel doesn't store enough inertia to get the car moving smoothly from a standing start.
Dan
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Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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07-05-2006, 09:22 PM
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CC Member
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Join Date: Jul 2002
Cobra Make, Engine: KMP329 w/KC489 Shelby
Posts: 392
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Not Ranked
Quote:
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The problem is an aluminum flywheel doesn't store enough inertia to get the car moving smoothly from a standing start.
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This is a rumor you hear from time to time, but it is absolutely NOT true. Never had a problem and of the several car I know with them, not a problem. |
07-05-2006, 09:33 PM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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I absolutely know the benefit of a light aluminum flywheel on the street. It spools up real quick and you save all of the parasitic HP losses wasted in trying to spool up a big 30lb unit. I was just interested if anyone had an opinion on RAM vs Fidanza
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LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
________
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07-05-2006, 11:09 PM
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CC Member
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Join Date: Jun 2003
Cobra Make, Engine: ERA 427 w/496 Side Oiler, roller, dual quads
Posts: 417
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Not Ranked
Quote:
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Originally Posted by The Dreamer
This is a rumor you hear from time to time, but it is absolutely NOT true. Never had a problem and of the several car I know with them, not a problem.
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While the issue is moot on this thread because CobraEd has decided he wants an aluminum flywheel, what I said about aluminum flywheels not storing enough inertia is no rumor. I experienced it myself with a toploader with 2.32 low and 3:73 gears. Others said they had no problem when using the wide ratio trans and it's lower first gear. My experience was having to rev the engine higher than normal to "launch" it from a dead stop; once moving, I could accelerate from 1,000 RPM or less with no problem. It was the initial launch, where the aluminum flywheel didn't store enough inertia, that was the only problem. On the drag strip or roadcoarse, aluminum is the way to go because the you're either reving the engine enough to overcome the inertia issue or starting from a dead stop is not an issue.
I'm sincerely glad, however, that you didn't experience the issue I did.
Dan
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Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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07-06-2006, 08:43 AM
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Club Cobra Member
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Join Date: Feb 2006
Location: Knoxville,
TN
Cobra Make, Engine: Ford F100; 496 Shelby, MassFlo, BlueThunder, Kee-Al-TopLoader, Detroit Locker
Posts: 84
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Not Ranked
I'd be real interested in any other opinions or rather experiences. I see that it is an issue of about 15 pounds difference between the flywheels. I guess that is about 30 percent. I find it hard to believe that it makes a lot of difference. Thanks, Scott
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Super Chief
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07-06-2006, 09:16 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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16lbs vs. 30lbs for a small block ford. 1/2 the weight. All the new HiPo factory cars are going to aluminum.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
________
Last edited by CobraEd; 07-06-2006 at 09:23 AM..
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07-06-2006, 09:21 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
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RAM Flywheel specs
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
________
Utinam logica falsa tuam philosophiam totam suffodiant!
________
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07-06-2006, 05:35 PM
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CC Member
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Join Date: Jun 2003
Cobra Make, Engine: ERA 427 w/496 Side Oiler, roller, dual quads
Posts: 417
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__________________
Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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07-07-2006, 07:05 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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From the RAM Web page:
"A lighter flywheel creates less inertia at launch, but will accelerate quicker through the gears. In order to effectively use a lighter flywheel, you must consider the car weight, operating RPM of the engine, and most importantly, the gearing".
This is exactly why a 2,300lb car with 400hp and 3.73 gears is idealy suited for an aluminum flywheel. A Cobra by definition is a competition car. They go like stink with these flywheels.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
________
Utinam logica falsa tuam philosophiam totam suffodiant!
________
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07-07-2006, 07:19 PM
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CC Member
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Join Date: Jul 2002
Cobra Make, Engine: KMP329 w/KC489 Shelby
Posts: 392
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Quote:
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I'm sincerely glad, however, that you didn't experience the issue I did.
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Nor anyone else I know who had one. I'm sorry you had a problem with yours. |
07-11-2006, 10:54 PM
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CC Member
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Join Date: Jun 2003
Cobra Make, Engine: ERA 427 w/496 Side Oiler, roller, dual quads
Posts: 417
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Quote:
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Originally Posted by The Dreamer
Nor anyone else I know who had one. I'm sorry you had a problem with yours.
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Now assume I really meant what I said, and wasn't making a dig at you.
Dan
__________________
Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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07-12-2006, 05:32 AM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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I have one of each right now............both 65 Mustangs, the race car weighs 2777, close ratio toploader,3.70 rear gear, 15lb. alum. flywheel, 331 stroker............the other is a street Fastback, 3060 lb., 351-W,Tremec five speed, 3.25 ear gear 30lb. steel flywheel............
Final gear drive in the race car is 8.5 in 1st gear, street car is 10.6......so there is big difference...........street car will take off from an 800rpm idle with no problems like it should, the race car needs a little more help feathering the throttle, but it's no big deal...........
It's hard for me to tell the difference in the flywheels when accelerating cause the street car has 350 hp and the race car has 472hp...kinda like apples and oranges, but in a lightweight Cobra, an aluminum flywheel should not be a problem...........
BTW; I'm running a Hays flywheel, I don't have any real preference in brands, I got this one for a steal from a guy that had it sitting in his shop for 2 years after he sold his "project car".........it was still new in the box and I paid 50cents on the dollar for it.........
David
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DAVID GAGNARD
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07-12-2006, 04:42 PM
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CC Member
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Join Date: Jul 2002
Cobra Make, Engine: KMP329 w/KC489 Shelby
Posts: 392
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Quote:
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Now assume I really meant what I said, and wasn't making a dig at you.
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I did, but I clarified that I and others I know with aluminum flywheels have not experienced the problems you had. With a single point, you can draw an infinite number of curves.
Quote:
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I'm sorry you had a problem with yours.
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Now assume I really meant what I said, and wasn't making a dig at you. |
07-12-2006, 11:01 PM
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CC Member
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Join Date: Jun 2003
Cobra Make, Engine: ERA 427 w/496 Side Oiler, roller, dual quads
Posts: 417
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Not Ranked
Sorry, I misunderstood you.
Dan
__________________
Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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07-16-2006, 07:56 AM
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CC Member
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Join Date: Jan 2002
Location: Lakeland,
FL
Cobra Make, Engine: ERA 427SC FMS 351W
Posts: 199
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Not Ranked
Hope more expereince is shared
CobraEd, it sounds like these light weight flywheels would be a great addition to our lighter weight cars. I am surprised my the shortage of personal expereince. I guess due to pulling the trans and the new flywheel not being visible, this modification is more rare.
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