7 replies to this topic

[Alastair Kirby]

I was wondering what are the benefits of lightenig the Flywheel?

I understand the point of removing mass from the roating assembly so less power is used to actualy 'move' the engine
Also that the car will rev faster and more freely as a result.
I already have a fully balanced rotating assembly (crank, flywheel, pistons etc.), which does make a massive difference.

Is there any other gain i'm missing here, less moving mass = Less fuel (i know it will be very small if any)

Has anyone lightened their flywheel/fitted a lightened one. How has it affected the driveability, lumpy idle etc.

Cheers

[The_Mistro]

as far as i know you should accelerate better with a lightened fly, but idle needs to be increased to compensate for the lower mass, atleast thats how i have always understood it

[Owen]

Be VERY careful lightening a standard flywheel. I've heard many horror stories about people who've done this and the flywheels have taken detours thru the bulkhead! Although I might have the wrong idea and your on about using an aftermarket steel/alloy one?


On to your question, i've got a lightened flywheel on my 998 and it picks up really well. The idle is still fine too (tho I suspect it makes more difference with a lumpy cam).

Edited by Owen, 16 June 2010 - 06:32 PM.

[Alastair Kirby]

Eeeee... that's not what ya want!! I will certainly be buying a very expensive alloy one now you've said that

My clutch has just exploded so i am in the process of dismantling that part of the engine. So looking for as many upgrades to do at once, Ya know as im there

I currently run a +0.040 1310cc balanced block, stage 2 head, 1.3rockers, 266cam, MegaJolt ignition system, HIFF44, stage 2 Maniflow manifold. There are loads of other things but that's primarily it.

[Dave33]

Use the one that minispares sell,they do 2, ones ultralight so will pickup very quick,the others not as light but alot lighter than a lightened standard one.
Like someone said it depends on cam spec if idles lumpy,im using a 286,and this needs quite a high idle setting,a 266 will be no probs with idle,as long as carb and timing are setup well.
Also minispares so a steel backplate thats lightened,
Have a look at there website and i think it gives quite a bit of info,including weights.
The trouble with some alloy flywheels is they will weld themselves to the crank tail,kad make one that has a steel inner section but a light alloy outer part.But its quite expensive,and would you notice it on a tuned rd car?
imho get the minispares steelflywheel and backplate,as there not expensive and are proven.
hth
dave

[Alastair Kirby]

Thanks all for the excellent advice. Will take it all under serious advisement!

[Alastair Kirby]

I have gone with the Mini Spares lightened flywheel for pre engaged verto cars. I will let you know what the results are.

[Cooperman]

Stritly speaking you should have the bottom end re-balanced, but in practice it may not be neessary if you don't intend using much over about 6200 rpm.
The flywheel you've chosen will be the best for your use as the ultra-light is really for ultimate rally or race engines.
It will accelerate much better and you will notice the difference in response.