Light Flywheels

[terryw]

Hi

I'm looking for advice on flywheels. I have a K series powered clubman sports car and I have a 5k for it. I want to fit a light flywheel. I have seen a TODA one listed for a 4k but it is very expensive. Can someone tell me (a) if there are problems fitting a flywheel for a 4k onto a 5k motor and (b) where do you get a light flywheel which costs less than a whole engine?!

Thanks

[Medicine_Man]

From what I understand it is not really worth the price/effort to go to a lightened flywheel..

[Killswitch]

I wouldn't have thought that the case, especially in a race car scenario. I don't know the dangers of lightening the original flywheel but I'm sure you could always take one to a shop and get them to suss it out.

 

Failing that, I can't see why it wouldn't be possible to get one made from billet aluminium if you supplied them a flywheel to base it off... can't say I know how much this would cost though but can't hurt to get a quote.

[kangaroosa]

I had my standard flywheel machined to lighten it up a little, whilst i was getting the clutch contact surface machined. It cost me a total of $70.

[muller]

The guy before me put mine in so i don't know how much it was or what it is even but does it rev up quickly :thumbsup:

[irokin]

JUN makes 3.7kg and a 3.4kg flywheels for 4Ks however I imagine the price is much like TODAs.

[BiGGy]

your talking hundreds of dollars for like 1kg reduction. I don't think its feasable, machining your current one will smooth it out giving you more clutch grip and lighten it up abit at the same time as kangaroosa said.

[Redwarf]

Light flyheels do make quite a difference. Until you want to go up a hill, which in this case isn't applicable. :thumbsup:

 

Most good engine shops should be able to do something for you, however you'll never get down to the weight of a Toda or TRD f/w. However, you're not selling your first born to get it either......

[Fraggle]

Light flyheels do make quite a difference. Until you want to go up a hill, which in this case isn't applicable. :thumbsup:

 

Most good engine shops should be able to do something for you, however you'll never get down to the weight of a Toda or TRD f/w. However, you're not selling your first born to get it either......

 

 

Like Redwarf said it does make a difference just got mine done and I must say it does get to 7grand a hell of a lot faster.

 

But it does take a little away from the staying power up hills????

 

I just had the stock 4k one done, good shops now how much to take off them.

[beerhead]

Lightening billet flywheels isn't a probelm, just don't go there with a cast one, my mate know's of a RX-7 driver that wrote off their car and tried to amputate there legs when it exploded, not very pretty.

[terryw]

Thanks for replies

Thanks for replies...a couple of questions

1. Can a 4k flywheel bolt straight onto a 5k motor (are the cranks the same in every detail?)

2. who currently makes custom aluminium flywheels? (do they cost less than the $800 for the TODA?)

I have decided against a lightened iron one, just aluminium sheet between it and my legs

Cheers

[Old-Skool-Rolla]

in the FAQ section, in the "building a tuff 4K motor" section, there is a really informative few paragraphs on lightened flywheels :P its really interesting :y:

[coln72]

People have been lightening cast iron flywheels for years, its just the ones that are done excessivly that cause problems.

 

Think I remember that unlightened flywheels in grey motored holdens would let go if you could rev them hard enough.

[Rolla__Boy]

This is my 5K isn't it?

[terryw]

it certainly is.....not put in yet, but I am hoping for great things from it. I thought I would get a steel flywheel as there is no protection at all for my legs if it lets go. And they rev quicker which makesa big difference in a flyweight car (400kg!)