Wun started installing a clutch

[AB7]

I wonder does lightened flywheel translate to faster acceleration time?
Wun, you should go to Calder drag and see what kind of time you get.
It would be interesting to see.

[Woo]

It should Andy, but gear changes require a bit more attention as the motor looses revs faster. Once you get used to it it should help marginally (possibly 0.5s over the 1/4)
It would also have to be Heathcote. Calder is still closed to drags
As soon as it re-opens (if) we'll have a "5's drag wars" challenge

Saw you today Wun heading south on Sprinvale near High St .... I didn't even get a wave You must of been in the new clutch zone.

Bazz

[fattima]

That's great news Wun, I was getting worried when you hadn't posted.

[wun911]

Sorry I didn't see any MX5 on the road, I was in the clutch zone or drinking lucky cup...

Im starting to understand what is going on when they say "light weight flywheel is bad for hills"

On the way a steep hill I have to drop down a gear; however the revs drop very quickly so you have to shift quick or rev match a bit to get up the hill, if not you feel like a snail. You just dont have access to as much stored energy in the flywheel, if the hill is not so steep there is no noticable difference thogh.

The other up hill problem I have noticed is when you stop half way up a steep hill and you want to get going again. You have to rev it higher than before to give the flywheel more energy otherwise you will stall. (Can easily stall on on up hill starts now but I'm learing)

Acceleration does feel good; it's still the same 81 rw kw car, it's just that you you can reach that 81 rw kw a bit faster than everyone else

Yeah I can borrow the giant ramps whenever I want for as long as I want and I have most of the tools for the clutch install (If you help me install my timing belt I will help you install your clutch) .

[eeden]

just came back from grampians, looks like i miss out the action.
awsome stuff wun. very impressed. good to see everything went smoothly, hope you can get the rest of the stuff you need by wed.

[Damo]

Well done Wun. Very impressive work!

[stevesports]

i would be down for Drags. I wonder how my 91rwkw compares to wun's 81 + super light flywheel. Hopefully i would get high 15's.

[AB7]

i would be down for Drags. I wonder how my 91rwkw compares to wun's 81 + super light flywheel. Hopefully i would get high 15's.

I down with it, let do it!
Steve, I reckon Wun probably go on diet, strip his car down, no interior, 1 seat & 2 Litre of petrol.

[wun911]

Today I got a chance to weigh the stock flywheel and clutch cover plate on a set of digital scales. I do understand that it may weigh a little less than a new one because some of the stuff would have been worn down. In hindsight I should have collected the clutch dust and weighed that as well but some say the dust is bad for your lungs.

I have photos but I will post them up when I get home.

The stock NB8B 1.8 flywheel weighs 7.803 kg. The result is interesting because I had always thought it weighed much more I had assumptions it was closer to 10 kg.



The stock NB8B clutch cover plate is 4.103 kg.


The stock frictional material is 1.086 kg
(180,000 km)

I’m sure you can you can shave off 3.564 kg off a stock flywheel and still have a decent safety margin, however weight is only part of the equation. I think it is more important to focus your attention on shaving the weight off the peripheral edge in order to “feel” the effects of the lightweight flywheel.

I would like to weigh a 1.6 flywheel if anyone has one that I can borrow for a day???

I contacted ACT to find out what the inertia of their flywheel they replied: 148 lbs*In2