Aluminum flywheel vs Steel and Clutch ?

[FUNFER2]

I do have a straight axle and it would take a lot of work to change to a IRS, and maybe not even work at all. But thank you anyway,

[Ronbo]

Hind sight being 20-20 I wish I had Kieth supply dyno #s below 4500 rpm just to see what the bottom end looked like. I opted for the .82 OD since there were a lot of people complaining about how sluggish the .64 made the acceleration.

Since I'm running the fuel injection, it's probably less of an issue than if I was running a carb.

Ideally the .64 would be a great 6th gear...

BTW don't forget about changing your input shaft if your going with an FE..

[patrickt]

Originally Posted by Ronbo

Hind sight being 20-20 I wish I had Kieth supply dyno #s below 4500 rpm just to see what the bottom end looked like.

Just stick her on a chassis dyno. Keith runs his dyno numbers without anything on the exhaust (as do a lot of builders). Dyno numbers for an engine sitting on a dyno with no mufflers/sidepipes (and maybe no water pump, etc.) can be very misleading.

[convincor]

not to hi-jack but anyone using a Fidanza flywheel??
http://www.fidanza.com/

[diegokid]

Here is two links for gearing calculators. One is preset with common rear gears and the other you can put whatever you want for a rear gear.

http://www.secondstrike.com/Technical/GearCalc.asp

http://www.classicchevy5speed.com/RPM-Calculator.aspx

[FUNFER2]

A friend has one & likes it.

[DougD]

The material used (aluminum or steel) is less important than the actual weight of the flywheel. There are lightweight steel flywheels out there that approach the weight of aluminum.

For a street car, the rule of thumb I've been told is that the flywheel weight should be approximately 1% of the car's weight. A 4000lb car should have a 40-pound flywheel. A 2500lb car needs a 25 lb flywheel, etc.

[FUNFER2]

Ya know, I never thought of that. I know you can get 40 lb and 20 lb. I havent checked but, for debate, how would a Billet flywheel be ?

[convincor]

The Fidanza weighs in at 14lbs.
You think that's to light??

[xracerbob]

I have the Fidanza flywheel on my 482. My feeling was that with 605 ft/lbs, I should be able to get the thing moving in first without too much trouble. I was/am trying to keep the total weight under 2350 which I think I have done. I have not driven the car yet, but in just checking the clutch release, it seems fine. As soon as the snow is gone (maybe July at this rate!) I'll find out.

[FUNFER2]

That will be interesting. Please let us know how if feels.

[patrickt]

I have the Centerforce #900260 aluminum flywheel on my 428FE. Why, you ask, do I have the zero balanced 427 version on my 428? Because with the SCAT stroker crank you internally balance the assembly. The flywheel weighs just over 17lbs and works just fine for me -- I wouldn't change it. I have no idea why Centerforce wants $750 for it -- maybe it's the beautiful gold inlay. The competitors are charging half that for theirs.

[FUNFER2]

$750, what's up with that !
"maybe it's the beautiful gold inlay"

[patrickt]

Originally Posted by FUNFER2

$750, what's up with that !
"maybe it's the beautiful gold inlay"

I don't remember it costing that much three or four years ago. And I don't have a good reason for spending the extra money on Centerforce if it did.

[undy]

The Ram aluminum flywheel that Keith provided with my 482 weighs 20 lbs and is SFI rated (important to me). ..no problem at all getting her rollin' either.

[JAM1775]

AL Flywheel = great investment.
Disadvantage ....slightly more drag on the decel vs steel FW

Advantages
Decreases centrifigul weight on the motor & makes car feel lighter to motor
Decreases the hit of the clutch on the tranny/tires due to less centrifigul force
Faster revs
Allows high reving off line wit less tire spin
Slows down faster

[FUNFER2]

Dave- The Ram aluminum flywheel is part #2519. $425.
That's the cheapest I've found. I'll call keith.

Jam- that sounds correct. Thank you.