lightened flywheel

[toyrollin]

got my flywheel lightened for my 4agze was approx. 6.1kg now just under 4.2kg now my mate offering me two hundy for it, only cost me a box for the machining any opinions?

[Jebus]

hehe, for box of beer lightened stock flywheel, youd be lucky to give it away. Let alone sell it for $200.

Take the money and run like a fat kid.

[no_8wire]

I always say: An items worth what someone is willing to pay...

[RedMist]

got my flywheel lightened for my 4agze was approx. 6.1kg now just under 4.2kg now my mate offering me two hundy for it, only cost me a box for the machining any opinions?

4.2kg... you are almost guarintieeing a dramatic, catestrophic and possibly injuring damage. My Chromemoly, Ultralight, formula atlantic flywheel is only 4kg.

[craigt]

Do yourself and your mate a favour and throw it away.
Lightening cast flywheels is like playing Russian Roulette, they have a habit of going bang because you have reduced the structural integrity to
5/8ths of f%^# all! All thats holding it together is the ring gear round the outside. I have seen more than one cast flywheel explode and luckily all but one the driver was able to walk away.
On our racecars we even replace the pressure ring in the clutch cover with a chromemoly one.
Buy a Lotto ticket instead, the odds are much better of a positive outcome!

[bluemaumau]

well put

[l1ttle_d3vil]

not trying to hijack the thread (i'd say the guys got his answer now anyway ) but what about aftermarket lightened flywheels, like from exedy etc? would I be wrong to assume they're safe based on the fact that a respected company sell them? or does lightened flywheel = bad. fullstop.

[big_boy]

the statments above are manily about lightened cast flywheels as apposed to machiened

[Dell'Orto]

So machining nearly 2kg off is different to lightening?

[slighty_sykotic]

Thing he meant pre lightened, like brought like that. Just badly put....


Ethier that, or i have no idea what hes going on about.

--Sykotic

[Adamal]

the statments above are manily about lightened cast flywheels as apposed to machiened

Heres a statement for ya that is both informative and easy to understand: You $&#$% your flywheel!!

[big_boy]

So machining nearly 2kg off is different to lightening?

no i ment cast fly wheels as oposed to a solid block machined in to a light fly wheel

[TRDmod]

well, yes its worth what someone is willing to pay. but you might get a stab wound after they discover that your fly wheel was responsible for a little claymore exploding in the car... probably leading to multipid lasarations and wounds, even death of the car and the person.

i suggest destroy it and get rid of it... or, sell it in an over seas online auction as something that its not... pretend that its forged or something... in that case you are playing the probability card that that person isnt gonna travel all this way to get you, even if they got shrapped...

or, sell it to your friend, change your name, address, rego and get a face lift to change your face like that CHARLES RAYNE from passenger 57, he keeps changing his face over and over again, so its hard to track him.

do that, it will be sweet as

[craigt]

There is absolutely nothing wrong with aftermarket light steel or even aluminium flywheels. I have never seen one of those go bang, I have however seen an aluminium one slog out the holes where it was secured to the crank. This was a locally manufactured item that was machined out of a poor grade aluminium.
The only problem is with LIGHTENED CAST IRON FLYWHEELS.
One of the best ones I have seen blow up was in a mini. The guy was very lucky the big bits went out through the front, they cut the chrome bumper in half on the way though. If they had gone back through the firewall he might not have been much good at taking a piss afterwards.
He just did his usual launch off the line at Ruapuna on a clubday and it decided it didnt want to play ball.
I stick by my lotto ticket comment made im my earlier reply

[Dell'Orto]

So machining nearly 2kg off is different to lightening?

no i ment cast fly wheels as oposed to a solid block machined in to a light fly wheel

Yeah billet flywheels are a whole different kettle of fish.

[crispy'86]

Dragging up an old topic here, but
How dramatic does the lightening process have to be to make the flywheel dangerous??
I have 2 glywheels, * 1 is a 16v unit that has been machined on front and back. on the front there is maybe 1-2mm material between edge of the flywheel and where the dowels and bolts locate the pressure plate, weighs 7.8kg
The other is a blacktop unit that has had maybe 900 grams machined off back of it only. according to club4ag standard blacktop untis weigh 5.9kg, this weighs around 5 kg, scales i used have a bit of inaccuracy.
I Now in this case i'd feel safer using the blacktop unit as it has the material on front to bolt clutch pressure plate etc onto it, the 16v unit i'd rather not have the pressure plate let go, saying as a dowel came dislodged unbolting flywheel off engine.
I know the statement still exists"how much do you value our legs" statement so what are thoughts. Someone else said "a little bit is safe" so how much is too much is the question

[ChaosAD]

http://forums.toyspeed.org.nz/viewtopic.php?t=29295&highlight=4age+flywheel+size

Could buy my exedy moly flywheel for $400
Or save a few pennies and use a lightened cast flywheel. You may need them to repair the shrapnel damage.

The flywheel may already have minute cracks in it, lightening it would increace its chances of ending in a catastrophic failure.

Might be sweet as, but I wouldnt risk it aye.

[Grrrrrrr!]

Can someone explain to me exactly what the problem with machining a cast flywheel is?

I understand that if the person takes too much material off in the wrong place there can be problems.

And that if you put an unbalanced flywheel on an engine you are asking for trouble.

But assuming that the material is all taken off low stressed areas of the flywheel and it is correctly rebalanced before use is there any other problem?

My reasons for asking are:

1) From what i can see the difference between a silvertop 20v flywheel and a blacktop 20v flywheel is that toyota have machined large chunks of unstressed metal out of the outer rim at the factory. So what exactly is the problem with doing this to a silvertop flywheel myself?

2) Most of the surface of a cast flywheel is machined anyway, the clutch friction surface(possibly several times throughout its service life), the center hole and faces ,flywheel bolt holes, the ringgear mounting surface are all machined anyway, so what difference does a little more machining make?

As far as i can see the biggest problem with machining of cast flywheels is people taking material off places where they shouldn't, raising local stress levels past what the cast iron can cope with, hence big problems.

I have a reasonable understanding of the basics of materials science like fatigue, fracture toughness, creep, precipitation hardening etc so dont be afraid to get technical, if i don't know it i can look it up and get myself edjimacated.

No rant/raving/flames please, if you can post a sound technical reason (or a link to one) i'd love to read it.

[jondee86]

It's fcuking annoying when a thread consisting mainly of hysterical,
unqualified hearsay and conjecture, is messed up by someone asking
for factual justification..... GRRRRRRRRRRRRRR!!!!!!

Everyone knows that machining a flywheel automatically turns it into
a weapon of mass destruction. Fcuk... I'm thinking of taking my car
down to the Beehive and red-lining it in the basement. Make those
1000 kg fertiliser bombs look like a girl's fart !!!!!

So kindly look elsewhere for your scientific explanation, cuz you ain't
gunna find any here !!!

Cheers... jondee86

[postfach]

Everyone knows that machining a flywheel automatically turns it into
a weapon of mass destruction. Fcuk... I'm thinking of taking my car
down to the Beehive and red-lining it in the basement. Make those
1000 kg fertiliser bombs look like a girl's fart !!!!!

haha, sweet




also, i just spend the best part of 5 seconds trying to annoy the bug on my screen with the mouse, before realising it was infact your avatar...