Lancia Motor Club

Model Technical and Interest => Fulvia => Topic started by: rodney3010 on 25 November, 2011, 09:07:21 PM



Title: Lightened flywheel
Post by: rodney3010 on 25 November, 2011, 09:07:21 PM
Whilst trawling the net I've come across an advert for the above. I can accept the weight saving but am unsure of the other benefits. Can anyone help out? Why bother (bearing in mind the price tag of 330ish)?
Rodders


Title: Re: Lightened flywheel
Post by: Jai Sharma on 25 November, 2011, 10:07:30 PM
No Link that I can see, but generally it is not so much the reduction in overall car weight as the reduction in fast moving mass that is the main benefit. In other words you have to speed up the flywheel to (say) 6000 rpm and then do it all over again in the next gear.

So the lighter it is the easier it is.


Title: Re: Lightened flywheel
Post by: nistri on 28 November, 2011, 07:51:00 AM
Idling can become lumpy with a lightened flywheel, Andrea


Title: Re: Lightened flywheel
Post by: DavidLaver on 28 November, 2011, 10:04:43 AM

Blips the revs up quicker for downshifts. 

When given a prod warming up it goes "wah wah" rather than "veeeerrrrroooom  verrrroooom".

"Lumpy idle" often then means you then need a much faster idle.  If you sit in traffic a lot then that's tedious.

David


Title: Re: Lightened flywheel
Post by: ColinMarr on 28 November, 2011, 12:55:07 PM
With an Aurelia, which has a remote clutch in the transaxle (and Flaminia too), the flywheel can be lightened by drilling holes in it see photo below. And with six cylinders to smooth it out, the tick-over was fine.

Colin


Title: Re: Lightened flywheel
Post by: davidwheeler on 04 December, 2011, 02:32:50 PM
Balance in narrow V4s is tricky and may be upset by changing the mass of the flywheel.   I don't know about the Fulvia but earlier V4 engine flywheels were individually balanced with their cranks.   I doubt if it is worth it unless you are going onto the track.