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12-26-2001, 09:18 PM
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CC Member
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Join Date: Sep 2001
Location: Danville,
CA
Cobra Make, Engine: CSX 6079 482CI CSX cross ram
Posts: 1,354
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Not Ranked
Flywheel Alum vs Iron
I have heard different opinions about Alum flywheels vs Iron, can you guys help me make up my mind?
I am building a ERA with a 428 fe
I have read this link by hayse http://www.mrgasket.com/haysfaq.htm
the third question down
Thanks,
Mike |
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12-26-2001, 10:41 PM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Rescue CA USA,
Posts: 1,613
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Not Ranked
It does say a lightweight high horsepower car - sounds like a Cobra.
As for the 60 foot times - they are important if you drag race, I guess.
My car (with an aluminum flywheel) did a 1.7 second 60 foot time.
I chose an aluminum flywheel so obviously I like them, they do make the engine sound better - when you hit the gas the engine revs FAST!
Ths has been talked about before - try a search.
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12-27-2001, 07:37 AM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
I posted the same question a few weeks back. Do a search if your interested. There's one on e-bay at the moment. There about $450 through Summit. Kinda pricey but the guys who have them seem to like them in our application.
Cheers Nick
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12-27-2001, 09:21 AM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Not Ranked
Don't rule out billet steel for a flywheel. Try Centerforce
Roscoe
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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12-27-2001, 09:45 AM
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CC Member
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Join Date: Sep 2001
Location: Danville,
CA
Cobra Make, Engine: CSX 6079 482CI CSX cross ram
Posts: 1,354
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Not Ranked
How do I do a search on this subject???
Mike  |
12-27-2001, 09:46 AM
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CC Member
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Join Date: Aug 2000
Location: Germantown, TN,
Cobra Make, Engine: Superformance #770, Stroked 351W (393 cubes) w/ Tremec TKO-600, 3.27 Torsen locker, 'Hi-Tech' Blue w/ White Stripes, Wilwoods, Bilstein coil overs...and a big ear-to-ear grin!
Posts: 1,147
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Not Ranked
Depends on what you want to do with your Cobra replica. If you want to drag race, a steel fly wheel has more inertia because it has more mass and will get you off the line faster. It takes a little longer to spin-up a steel flywheel, though. An aluminum flywheel will rev-up faster because it has less mass and therefore it spins up faster. But, since it has little mass, it doesn't have much inertia and won't get you off the line as fast as a steel flywheel will.
General rule of thumb is use a steel flywheel for drag racing, an aluminum one for road racing. All around driving is a toss-up as far as I'm concerned. All this goes out the window, though, if you're building some kind of monster 650hp+ all out, nail-your-balls-to-the-wall, step-on-it-and-hang-on, drag racer...
FWIW, I asked the same questions of Bob & Dennis Olthoff when I bought my SPF. Their experience is second to none in these matters. Their advice was to go with steel for the above reasons, as a steel flywheel is more durable and easier to find someone to refinish it when it's clutch time.
Of course, that;s my opinion, I could be wrong... 
__________________
Flyin_Freddie
"An opinion on everything...an expert at nothin'!"
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12-27-2001, 10:11 AM
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CC Member
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Join Date: Feb 2001
Location: Southern,
IN
Cobra Make, Engine: SPF
Posts: 118
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Not Ranked
Idle is always a part of the puzzle.
I have a 486hp 460 crate with aluminum.
A friend has the 535hp 460 crate with steel.
These two cars idle exactly the same. I think it is the flywheels leveling the playing field. Just a guess.
Bob
ps..the aluminum is holding up fine after alot of abuse. I have a backup flywheel, clutch and pressure plate waiting for the day. This way I don't have to worry about how long it takes to get the old parts serviced.
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12-27-2001, 01:47 PM
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CC Member
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Join Date: Oct 2001
Location: Magnolia, Texas,
Posts: 181
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alum vs steel/iron
on bb fe/385 fords i would stick with the steel/iron, best practical all around. on our bb racer, the aluminum works fine, but doesn't seem like a lot o difference, just changes up your driving style into and out of apex. personally i think it works the brakes more, might be just me shakin the old 60's/70's feel of flywheel doom with the alum. had one explode dragracing in the 60's w/o a scattersheild, that you don't forget.
__________________
SonnyB
Last edited by Sonny; 12-27-2001 at 01:50 PM..
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12-27-2001, 08:04 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
My questions were on smooth idle and did people feel safe revving them. Obviously a blowproof bellhousing is a must. A search is done under member visitor tools.
Cheers Nick
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12-27-2001, 08:55 PM
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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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Not Ranked
I think steel is more durable in the long run and you can certainly have a steel flywheel lightened a lot. In our old dirt track car we were not allowed to run aluminum flywheels,but played around with a couple of old steel ones and had one lightened to within a few pounds of an aluminum and ran it for two seasons with no problems,no cracking or anything else. I never thought it would last it was so thin,thought it would crack soon,but help up well under 6,000 rpms all nite racing for two years till we went with a different flywheel,clutch setup.......
David
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