lightened flywheel
Author
Discussion

bin looney

Original Poster:

97 posts

242 months

Friday 5th January 2007
quotequote all
has anybody fitted a lighted flywheel to there v8.
just fitted one to my track car but unable to test at the mo.
would like to know what you gain and what you loose dudes.

rev-erend

21,619 posts

313 months

Friday 5th January 2007
quotequote all
Fitting a lighter flywheel :

Improves acceleration
Revs faster

But Poorer driving due to less flywheel mass (jerky in traffic..)

If you do this - take it to a RV8 specialist and not the local
engine shop .. if it breaks you will know about it.

There are also billet steel and alumimum jobbies for sale :

www.v8tuner.co.uk/category.php?id=20

At a price.

This explains all :
www.pumaracing.co.uk/FLYWHEEL.htm

Edited by rev-erend on Friday 5th January 20:24

YI8TVR

1,105 posts

279 months

Friday 5th January 2007
quotequote all
Not advised for a road car as your idle will be non existent

350matt

3,896 posts

308 months

Friday 5th January 2007
quotequote all
Depends on where you're starting from, most stuff designed in the 70's and 80's ie a rover V8 is a bit on heavy side and can stand to lose about 25-30% with little effect on idle quality, just be carefuel where you take it from. do it in the wrong spot and the flywheel can be seriously weakened and possibly explode.....

Mat

midas dude

213 posts

244 months

Friday 5th January 2007
quotequote all

You shouldnt get any problems ,if the jobs done by a pretty savvy race engine tuners.

jmorgan

36,010 posts

313 months

Friday 5th January 2007
quotequote all
Mine has been done by the builder (engine builder before some card chips in with Bob). Spins up like a good un. Behaves to some extent in traffic. Not sure how much he took off/lost/magiced or whatever the process is.

mars

10,106 posts

243 months

Friday 5th January 2007
quotequote all
Everyone told me not to buy the lightest flywheel for my Caterham because it would be jerky and difficult to use on the road. That was just claptrap. I bought one and it worked fine. Any momentum stored by the flywheel will be dissipated so very soon after you first engage the clutch that it's irrelevant. You still need to apply the right foot.

If it'll idle, it'll be fine. I suspect it'd idle with a piece of cardboard in place of the flywheel. The RV8 crank alone weighs a fair bit, a clutch is usually the component you can't reduce the weight of, and they're bloody heavy. I suspect the whole rotating mass could stand to lose several Kgs.

bin looney

Original Poster:

97 posts

242 months

Saturday 6th January 2007
quotequote all
the one i have weighs 7 kilos, the original was 14 kilos, on tick over and revving up it feels the same.
i heard you would loose torque, but i have reduced wheel size to 13in with slicks and put the flywheel in to get more gear changes really, as on a track i was in third all the time still good but room for improvement.
thanks for the advise kids.

bin looney

Original Poster:

97 posts

242 months

Saturday 6th January 2007
quotequote all
i was told also by a race driver with a rv8 you could use a drive plate off a auto gearbox with a different clutch.

Horse_Apple

3,795 posts

271 months

Saturday 6th January 2007
quotequote all
My old Griff had a lightened flywheel at the time it had the higher cam and oversized valves fitted.

What it meant was that the engine revved much, much more freely and all the work combined shifter the torque curve up and so the real power came in later and lasted longer.

It meant that you could no longer drive around town in top and that to get the power you had to start using the box more but that was exactly what I was looking for. I wanted a car which was more involving for me.

It didn't have any great effect on the idle or shunting.

YI8TVR

1,105 posts

279 months

Saturday 6th January 2007
quotequote all
YI8TVR said:
Not advised for a road car as your idle will be non existent



I stand corrected