Lightned Flywheel

[ke rollin 20]

hey guys an girls,

 

i am going to drop my flywheel off to get lightned tomoro but i don't no what to get it machined down to??

 

its going on a slightly worked 5k, so what kind of weight do i want to go down to so it will rev pretty high but still drive kind of nice...?

 

i weighed the flywheel that i got out of a 3k engine and it was around 6.90kg i reckon, so what would i get it down to like 5 or 6kg????

 

let me no asap.

 

haydn.

[philbey]

Mate, get the workshop doing it to make that suggestion, they'll be able to take a look at it and tell you much more comprehensively.

 

It's not really an issue of how much weight you take out, its more to do with where you take the weight out.

 

For example:

Remove 1kg out of the centre, (up to a diameter of 150mm) you will see ~5% reduction in flywheel inertia.

VS

Remove 0.5kg from the outer edge of the flywheel (inner diameter 280, outer diameter 320) you will see ~25% reduction in flywheel inertia.

 

This is a very crude estimation, considering a uniform flat flywheel of diameter 320mm, but it is an effective means of demonstrating that overall mass isnt the critical dimension to consider. Removal of material from the outer periphery is also better as the material there is under less strain.

 

The other thing to consider is where you can actually remove meat from, depending on bolt areas, clutch surfaces ring gear, etc.

 

I will measure up my flwheel while its out of the car and do some calculations to see where the best places are!

Edited December 14, 2008 by philbey

[styler]

what he said ^^^

 

also you can't remove too much overall or from remove very much

at all from certain areas. a proper shop should be able to tell you how much they

can remove safely. get it balanced after as well obviously.

[ke rollin 20]

ok cheers guys, i guess ill just check with the bloke doing it, he should no best i spose thanks for the heads up.

 

haydo

[LittleRedSpirit]

ok cheers guys, i guess ill just check with the bloke doing it, he should no best i spose thanks for the heads up.

 

haydo

 

 

This is how Toyota did it on the factory lightened 4age flywheels. It might be of interest to you.

Edited December 20, 2008 by LittleRedSpirit

[philbey]

I don't dig the fact that they haven't radiused the corners at the base of those lugs.....

 

I'd be getting that crack tested before I stick it in any of my cars!

[LittleRedSpirit]

I don't dig the fact that they haven't radiused the corners at the base of those lugs.....

 

I'd be getting that crack tested before I stick it in any of my cars!

 

I'm sure Toyota know what they are doing.

 

The sky is falling, the sky is falling.

[Jason]

Lets see!

 

say what? nice conservative amount of 100kw at 6000rpm equates to around 190nm.

 

At a radius of 100mm thats about 2kN. Thats looks like a stress concentration of around say 2 even 3 for even more conservative results. 6kN acting at all 6 points. 1kn acting per lug. Easily take that in repetitive loading.

 

:lmao:

[LittleRedSpirit]

Lets see!

 

say what? nice conservative amount of 100kw at 6000rpm equates to around 190nm.

 

At a radius of 100mm thats about 2kN. Thats looks like a stress concentration of around say 2 even 3 for even more conservative results. 6kN acting at all 6 points. 1kn acting per lug. Easily take that in repetitive loading.

 

:y:

 

 

I think you just said what I said in far more educated terms. Well done.

:bash:

[Jason]

Glad to be of service :bash: