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Will aluminum flywheel be a disaster?
#900236
01/09/11 02:14 PM
01/09/11 02:14 PM
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Joined: Mar 2005
Posts: 862
Iowa State fan
kilroy
OP
super stock
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OP
super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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Ok, Im upgrading my disk in my 4 speed to a ram 900 series. It requires a steel flywheel to run. I dont have the $ to buy a new $300 steel flywheel. I do have enough to buy the disk and a $60 steel insert for my old aluminum wheel.
Problem is Im running a eddy headed 440 in a 3800-4000lb charger with 3.55 rear gears.
Will this be a disaster as far flywheel inertia getting a heavy car moving or should I be ok?
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Will aluminum flywheel be a disaster?
[Re: 9 Sec Phill]
#900238
01/09/11 02:22 PM
01/09/11 02:22 PM
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Joined: Mar 2005
Posts: 862
Iowa State fan
kilroy
OP
super stock
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OP
super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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Anyone have real street or strip experience with aluminum flywheel in or near these specs?
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Will aluminum flywheel be a disaster?
[Re: 9 Sec Phill]
#900239
01/09/11 02:23 PM
01/09/11 02:23 PM
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Joined: Jul 2008
Posts: 30,470
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,470
Florida STAYcation
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Quote:
Don't do it, You knew the answer already. to heavy of a vehicle and to high a gear.
x2 ...  ... you should be running a REAL HEAVY steel wheel !
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Re: Will aluminum flywheel be a disaster?
[Re: dOc !]
#900240
01/09/11 02:30 PM
01/09/11 02:30 PM
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Joined: Mar 2005
Posts: 862
Iowa State fan
kilroy
OP
super stock
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OP
super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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YA, dang I thought so but.... crap I hate common sense. Anyway most of these cars are this weight, ive actually shave a couple of hundred pounds. Car used to weigh 4250 but I cut crash beams out of doors (38lbs!!!), aluminum Master Cylinder, mini starter, aluminum heads and water pump housing, removed factory insulation, crash bumperets and brackets, and more I cant think of right now. So to say a real heavy flywheel is a little ridicules. plus steel flywheels aren't much different weight than factory stuff. 
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Will aluminum flywheel be a disaster?
[Re: kilroy]
#900241
01/09/11 02:30 PM
01/09/11 02:30 PM
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Joined: Oct 2004
Posts: 6,293
Northeast, Alpine, NY
9 Sec Phill
On a road near you
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On a road near you
Joined: Oct 2004
Posts: 6,293
Northeast, Alpine, NY
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Quote:
Anyone have real street or strip experience with aluminum flywheel in or near these specs?
Mine was 3000lb duster with a sb and 3.91 gears. It killed it. If I had some 5.38 It might have been a differant story.
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Re: Will aluminum flywheel be a disaster?
[Re: kilroy]
#900245
01/09/11 09:55 PM
01/09/11 09:55 PM
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Joined: Nov 2005
Posts: 690
New Hampshire, USA
oldiron
mopar
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mopar
Joined: Nov 2005
Posts: 690
New Hampshire, USA
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I don't see any problem with it. I don't know why a steel FW is required. The AL wheel has a steel insert. As far as stored energy, the flywheel is just part of the rotating mass and all of the energy is stored in your gas tank to begin with. To increased the energy stored you just need to increase the launch rpms (http://en.wikipedia.org/wiki/Rotational_energy) The sintered iron will be pretty grabby and if you plan on racing its going to be hard on parts. You can control some of that with air in the tires and how quick you shift. Have fun!  Greg
66 Belvedere Vert, 4 Speed/Jerico, slowly, very slowly, getting faster - NA LD Wedge New New Best: 10.56 @129 68 B'cuda 4 gear Jerico - Another New Best of 9.86 & Trying to slow up https://www.youtube.com/watch?v=T4jDLKwd9Gs
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Re: Will aluminum flywheel be a disaster?
[Re: kilroy]
#900250
01/11/11 12:32 AM
01/11/11 12:32 AM
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Joined: Dec 2004
Posts: 10,556
Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,556
Rittman Ohio
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I have had this conversation in the pits at a few UMTR races and some say that an aluminum wheel may lose a little at the hit but it recovers quicker between gears  I have a lightened steel unit in my car at only 22# which seems like the best of both worlds.Although my flywheel weighs more than some of the complete assemblies out there from Advanced and Bonifonte custom jobs. Gus 
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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Re: Will aluminum flywheel be a disaster?
[Re: 68LAR]
#900254
01/13/11 09:19 PM
01/13/11 09:19 PM
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Joined: Jan 2003
Posts: 9,881
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,881
Weddington, N.C.
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Kilroy, Borg & Beck = no centrifugal apply leverage plus the rotating mass is higher than a typical centrifugal clutch/pp set up, I don't think I'd want to bolt a heavy countersprung mass to the aluminum polt holes and try any kind of modulation from a light....A Modern design dual surface friction disc like South Bend would be my choice for something easy to shift fast with high holding force and lighter mass. Higher rotating mass counteracts the reason for going to a light flywheel in the first place. I haven't switched back to a 4 speed for my 517 yet because I haven't researched enough of the options for clutches, I would consider a light flywheel because I have pretty unholy torque but to my mind you have to have some initial 'give' like a diaphagm clutch would have before the bite. You have to be careful with centrifugal assists as well (longs can fall into this category too).....during part throttle shifting you could see some slippage because you're not generating ebnough rotating inertia to engage the counterweights.....to me it'd be a tough balancing act to get a 'just right' street strip clutch but there are experts that know a lot more about this than I do....i'm just an expert at shifting  I know what I'm looking for I just don't know if I can get it...but when I'm ready I'll talk to the south bend boyz first!
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Re: Will aluminum flywheel be a disaster?
[Re: Streetwize]
#900255
01/13/11 10:35 PM
01/13/11 10:35 PM
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Joined: Jan 2006
Posts: 587
IL . usa
cjs69mope
mopar
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mopar
Joined: Jan 2006
Posts: 587
IL . usa
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I am running a all aluminum fly wheel from ram with the steel insert
and the engine is a street /strip 493 Rb with hemi 8 bolt crank ,and 10.8 compression . solid roller cam,Indy Sr heads.
the trans is 18 spline hemi 4 speed in a stock heavy 69 dodge charger
with 4:10 detroit locker
This is been my experiance First the car launches hard on the street with drag radials , never had the car together with a heavy fly wheel
so i have nothing to compare it to .
the clutch is a dual friction center force works great i love the light pedal feel and shifts so smooth that some time i don't think it got the gear because so quick .
the only thing i feel is at very low speeds less than 2000rpm the car seams to have a pulsing feel to the drive train , i have read that this is a side affect of low speed inertia you are talking about .
But all the other benefits seam good, car revs real quick like a small stock car engine .
1969 Dodge Charger
1969 Dodge Superbee
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