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Litening a flywheel
https://ausmini.com/forums/viewtopic.php?f=5&t=32589		 Page 1 of 4
Author:  mason [ Thu Jun 07, 2007 2:54 pm ]
Post subject:  Litening a flywheel
How lite can you go with a A+ flywheel
Author:  Wombat [ Thu Jun 07, 2007 4:52 pm ]
Post subject: 
For a standard cast wheel this is about optimum http://universe.websiteactive.com/~ausmini/forums/viewtopic.php?t=28969&highlight=flywheel+lightening
Author:  drmini in aust [ Thu Jun 07, 2007 7:42 pm ]
Post subject: 
David, he says A+ so it's probably the dreaded Verto one. I have no idea on those friggin' things... If I ever got one I'd bury it. :lol:
Author:  mason [ Thu Jun 07, 2007 9:07 pm ]
Post subject: 
Doc it has not got a verto clutch. Clutch plate and back plate on primary gear side and diapham on release bearing side
Author:  drmini in aust [ Thu Jun 07, 2007 10:03 pm ]
Post subject: 
I just weighed the last 2 piece flywheel I did. it's 6.1KG.
Yes I know you can go lighter, some people drill holes etc- but this is for road use, light enough IMO.
I also lighten the backplate by making it curved triangular, similar shape to a Wankel rotor. I'll find and weigh one in the morning. :wink:

<edit> My Minispares UK catalog says a safely lightened (one-piece?) flywheel is 6.05KG so I'm on the money.
Author:  smac [ Fri Jun 08, 2007 7:11 am ]
Post subject: 
Mason, I've got a Lyn Rogers lightened one from a mini7 race car sitting on the shelf.....it's more air than metal and he said he probably wouldn't put it in a big bore, but don't let that stop you :wink:
Author:  drmini in aust [ Fri Jun 08, 2007 8:31 am ]
Post subject: 
drmini in aust wrote:
I just weighed the last 2 piece flywheel I did. it's 6.1KG.
Yes I know you can go lighter, some people drill holes etc- but this is for road use, light enough IMO.
I also lighten the backplate by making it curved triangular, similar shape to a Wankel rotor. I'll find and weigh one in the morning. :wink:

<edit> My Minispares UK catalog says a safely lightened (one-piece?) flywheel is 6.05KG so I'm on the money.


OK I just weighed a pair of backplates. Stock one is 2.6KG, my triangularly lightened one is 2.1KG. 8)
Author:  mason [ Fri Jun 08, 2007 7:44 pm ]
Post subject: 
The flywheel i have is 5.7 kg so im going to leave it as it is .Thanks for the advise
Author:  Bubbacluby [ Sat Jun 09, 2007 10:24 pm ]
Post subject:  pros and cons fly wheel
whats the advantage of a lightened flywheel - does it only help you get the revs up better??

Do they lose horse power - like a heavy one when it starts moving takes a lot to stop can have more restriction and still turning, where as a light one wont?

Do they have any disadvantages??
Author:  1018cc [ Sat Jun 09, 2007 10:34 pm ]
Post subject:  Re: pros and cons fly wheel
Bubbacluby wrote:
whats the advantage of a lightened flywheel - does it only help you get the revs up better?? acceleration is quicker because there is less mass to spin up and get moving

Do they have any disadvantages??disadvantages are that you are more likely to stall the car taking off as the flywheel won't have as much centrifigal energy to keep the engine turning over
Author:  jbeenz [ Sun Jun 10, 2007 7:39 am ]
Post subject: 
smac wrote:
Mason, I've got a Lyn Rogers lightened one from a mini7 race car sitting on the shelf.....it's more air than metal and he said he probably wouldn't put it in a big bore, but don't let that stop you :wink:


is it for sale?
Author:  smac [ Sun Jun 10, 2007 8:14 am ]
Post subject: 
Sure. I was thinking about chucking on my 850 but that's sold, only have the 1380 now and that has a steel ultra light already. Would get it crack tested etc before using it, and maybe have a chat to senior Rogers or even take it to him since you're up that way. PM me with an offer.
Author:  CPOCSM [ Sun Jun 10, 2007 11:01 am ]
Post subject: 
Yes it allows the engine to rev out quicker since you have removed mass and it should rotate quicker(I think). However the downside is you lose some low down torque but it is negligible. I have a lightened one in the new engine and it is much of a muchness(static it revs better under load however the dyno showed a little drop in the low torque - you just have to get it there with gearing and changing them higher up the rev range)

I just recently changed the flywheel on the Soob and they tooK a massive 2.6kg out of it. Revs its tits off now but I have noticed a little loss in low range torque when I am traversing the dirty stuff but it gets up to operating revs quicker. It is a compromise I suppose.

Heres a pic of the Soob Flywheel - consider that the original is completely flat from the edge to the centre: They took it off the engine side only and it took them 3 hours just to mill it down(hard stuff this...lol):

Image

Image

Image

Not real good pics but you get the idea

Hooroo
Author:  LS1380 [ Sun Jun 10, 2007 11:53 am ]
Post subject:  Re: pros and cons fly wheel
Bubbacluby wrote:
whats the advantage of a lightened flywheel - does it only help you get the revs up better??

Do they lose horse power - like a heavy one when it starts moving takes a lot to stop can have more restriction and still turning, where as a light one wont?

Do they have any disadvantages??

It revs hard :shock:
Image
Author:  CPOCSM [ Sun Jun 10, 2007 12:29 pm ]
Post subject:  Re: pros and cons fly wheel
LS1380 wrote:
Bubbacluby wrote:
whats the advantage of a lightened flywheel - does it only help you get the revs up better??

Do they lose horse power - like a heavy one when it starts moving takes a lot to stop can have more restriction and still turning, where as a light one wont?

Do they have any disadvantages??

It revs hard :shock:
Image


BLOODY HELL!!!!

Nice looking gear there. Do your revs drop off quicker with that setup? I noticed the Touring Wagon goes up quickly to revs but drops back even quicker now...

Again nice gear...

Hooroo
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