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02-02-2003, 01:00 PM
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Banned
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Join Date: Jan 2003
Cobra Make, Engine:
Posts: 1,085
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Not Ranked
Aluminum or steel Fllywheel - 460
I know aluminum is lighter and therefore easier to turn, but what are the down sides of it? rougher engine, I assume, anything else?
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02-02-2003, 01:32 PM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,593
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Not Ranked
I don't know how you plan to drive your car so it is hard to answer this question, but aluminum being lighter will let you wind the motor up faster. On the other hand you will have less quick slowdown on compression when you lift off the throtle. It is really a matter of what you want and how you plan to drive the car. I don't think you gain much for normal street driving or crusing with the lighter rotating mass but for racing you will gain some.
Ron  |
02-02-2003, 01:45 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
A little rougher idle could be expected, because of the effect a heavy flywheel has on the dampening of the power pulses. However the main difference is the stored inertia used to launch the non moving car. A lighter or smaller diameter flywheel will have less stored energy, but on a light car such as a Cobra it is of little consequence. A lighter flywheel will allow the engine to RPM quicker (better throttle response) due to lower moment of inertia.
The 4" & 5" multi disc clutches (read $$$$$) that use a small diameter flywheel have a very low moment of inertia and are used extensively by F-1, Trans AM and several other classes of high end racing. The down side of them is that they do not allow for much slippage and are therefore not very user friendly for street usage. I used a 7" Tilton clutch & flywheel on a Datsun 510 years ago and the difference realized in throttle response for Auto X was quite substantial, but it was either "ON or OFF" no slippage allowed or it would burn itself up quickly. Great for that type of application.
Rick
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02-02-2003, 04:36 PM
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CC Member
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Join Date: Dec 2002
Location: caledonia,
il
Cobra Make, Engine: #1459 w/460(sold)New(used),spf w/427s.o.(sold)
Posts: 578
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Not Ranked
RSIMOES,
Just had my 460 built by eric at performance engineering and he suggested an al. flywheel. Also went w/a roller cam and lifters,850 demon and roller rockers. Dyno #'s were 552hp/560tq(500ft. lbs. at 3000 rpm) with 10:1 comp. Engine sounds and revz great. Very tight fit....
Good luck.
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02-02-2003, 04:44 PM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
With a big-inch engine and light car such as the Cobra, go with an aluminum flywheel. The only place a heavy flywheel will do you any good is acceleration from a dead stop and that will be negligible. A rougher engine won't result as engine pulses are damped by, guess what, the crankshaft damper.
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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02-02-2003, 05:06 PM
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CC Member
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Join Date: Mar 2001
Location: Indianapolis, Indiana, U.S.A.,
IN
Cobra Make, Engine: Home built, supercharged 544cu/in automatic
Posts: 924
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Not Ranked
Interesting subject. Have you ever held a bicycle rim with both hands and spinned it? Now try to change directions with it. The reason f1 cars as well as all roadracing cars use smaller clutches is it gives competitive advantages for road racers because they don't resist changing direction as much. Straightline cars like drag cars can use heavier/larger wheels generally along with their larger clutches but only to a certain point. Depends on torque your engine produces and what you are trying to do I guess. Generally smallblocks favor aluminum wheels and smaller clutches though. My drag big block car of presant used a 40lb steel wheel when it was a stick/4speed. Most important thing in my mind though is to use a explosion proof bell-housing. And sometimes they are tough to fit up to hot rod clutch/ flywheel combo's. BTW - aluminum wheels give up heat faster than equivalent steel wheels, and will help clutch fade with road racing cars. So it depends on what you are doing I guess. cobrashock
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Ron Shockley
Last edited by cobrashoch; 02-02-2003 at 05:15 PM..
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02-02-2003, 05:12 PM
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CC Member
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Join Date: Apr 2002
Location: Alpharetta,
GA
Cobra Make, Engine: Sold - Unique FIA - SA 396 Stroker
Posts: 2,440
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Not Ranked
The aluminum flywheel allows your motor to "bark at bystanders" Bill Parham. I will be barking 
Randy
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Sold the Unique - Bought a Porsche TT - Sold the TT - Bought a truck
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02-02-2003, 06:39 PM
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CC Member
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Join Date: Oct 1999
Location: Prosper,
TX
Cobra Make, Engine: CAV GT40 #169, Ford 408 Stroker & ZF Transaxle
Posts: 2,408
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Not Ranked
Go with Aluminum! I had one in my 514 big block and it let's the big block rev up faster.........
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Gary
CAV GT40
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02-02-2003, 07:35 PM
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CC Member
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Join Date: Apr 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 1,112
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Not Ranked
Aluminum--w/o a doubt.
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Bill Malone
Gashole
CSX4786
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02-03-2003, 04:45 AM
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CC Member
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Join Date: Jun 2002
Location: melbourne, australia,
Posts: 459
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Solves my query as well, thanks guys.
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All torque, no traction!
Anything is possible (if you can justify throwing bucket loads of money at it!).
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02-03-2003, 11:38 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
Aluminum hands down. Unless you can find something lighter.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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02-21-2003, 02:37 PM
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CC Member
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Join Date: Dec 2002
Location: MI,
Posts: 1
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Quote:
Originally posted by sparks
RSIMOES,
Just had my 460 built by eric at performance engineering and he suggested an al. flywheel. Also went w/a roller cam and lifters,850 demon and roller rockers. Dyno #'s were 552hp/560tq(500ft. lbs. at 3000 rpm) with 10:1 comp. Engine sounds and revz great. Very tight fit....
Good luck.
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Hey Sparks,
Just curious, do you know the which cam eric used, and what are the specs? |
02-21-2003, 04:05 PM
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CC Member
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Join Date: Dec 2002
Location: caledonia,
il
Cobra Make, Engine: #1459 w/460(sold)New(used),spf w/427s.o.(sold)
Posts: 578
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Not Ranked
Jim,
Crane cam. Part #359351 Hydrolic roller special.
intake @ cam 345 @ valve590
exhaust@cam 359 @ valve614
Are you building or experimenting?
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