I'll bet this is a wasted mod for an auto sad.gif Probably because the tranny will compensate for or absorb the new found power.
Am I in the ballpark?

 

No exactly, I was told, although I did argue, that we autos don't have a flywheel. We have a flex plate. Unlike my old school GM motors. If we did I would machine it.
After lighting the stock replacement has anyone thought of Cryo treating it to be stronger?

[ August 30, 2002, 12:54 PM: Message edited by: DESIGN ]

 

Random, i think i'm the other who weighted a flywheel,
Material used by hyundai looks more like cast iron then steel
I have 3 flywheels here, the earlier 2.0 flywheel weight around 16.25 lbs and the later 2.0 (tibs and lantra) both weight a bit more at around 16.5 lbs
and i have one wich his already lightened and it weight 12.75lbs
and yes you do have to rebalance the flywheel if you install it on an already built engine,if you're building the engine the mechanic who's building your engine should (at all times)rebalance the WHOLE rotating assembly (crank,rods,pistons, damper,flywheel)

and on an autotragic equiped car the flywheel is a Flexplate wich is in fact very thin,so you can't lighten it

 

ok i got home and reweighed the flywheel it is 16lbs my bad and the clucth weighs 10 lbs

but here is what i am thinking
that it may only take off 2 lbs or so but the wieght that is removed is from outer edge were it makes the most diffrence

if you have a 20 lbs. flywheel thats only 5 inch in diameter the centrifical mass is so close to center that it take less time reach it max revolution
than a flywheel that 10 lbs. and 10 inch diameter

and the machine shop that im dealing with does this all the time since its a performance shop
thats all they do and he said thad it would be stronger because it would have less wieght trying to pull it self apart but thats what the guy said i dont know

 

damn, that lip is thicker than I remember. You could probably shave off MORE than 2 lbs by removing that.

Again, my my concern would be STRENGTH. If the flywheel IS cast like Dennisst99 stated, then removing that weight from the edge could severly weaken the structure.

Looking at that photo you posted, it sure does look cast, then lightly machined. I would hand it to them and see what they say. If they don't think they can do it, they SHOULD tell you.

 

I just got my new clutch the other day and when we had it all out we got it lightened and balanced, it made a good difference (more than what I expected (easier to match the revs when braking) they shaved a fair bit of weight off, and the dudes that did it said they do it all the time, and haven't had any problems with weakening, it only happens if they go stupid and take a cr@p load off.

 

Random, the way mine was lightened it won't affect its strenght,Horror stories about flywheel wich *exploded* are most of the time caused by guys wanting to remove to much weight,they guys that lightened mine did a lots og them and never had a bad experience
surely if you spin a stock flywheel up to 10000rpm it might explode (wasn't designed for this)a lighter stock one *might* hold up better since it will see less inertia forces
for a good street engine i'd use a lightened stock one but on a high revving built enginei'd use a flywheel wearing an SFI tag
I did see what a bad flywheel can cause...
one chopped header on RWD datsun drag car,and one one trough the dash in a old 1970 camaro....
in both cases drivers din't suffer any harm but had the scare of their live!

Denis