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Lightened Flywheels

Subject: Lightened Flywheels
From: scirious@hotmail.com (Brian Haygood)
Date: Wed, 27 Mar 2002 21:49:35 -0600
References: <OIEBJHGPLJOEEBIBNEEACEHNCCAA.tpiwonka@ttacs.ttu.edu> <OE51zdDW6lCPx33E1io000190b7@hotmail.com> <3CA2204A.2DFE3F6F@ix.netcom.com> <001601c1d5cc$08ca87e0$1401a8c0@Jason>

That's true, but that's not how you are supposed to downshift.  You should
match the engine revs to your speed and then let out clutch.  Doing
otherwise results in more clutch wear and jerkiness, which is never good.
Also, could theoretically hurt the springs in the clutch disk by putting too
much load on them.

BH

----- Original Message -----
From: Jason Adams <roclist@accessconsulting.ca>
To: <jdbubb@ix.netcom.com>; Ken Bates <indiana_red@hotmail.com>
Cc: 'scirocco' <scirocco-l@scirocco.org>; Robert Piwonka
<tpiwonka@TTACS.TTU.EDU>
Sent: Wednesday, March 27, 2002 2:14 PM
Subject: Re: Lightened Flywheels


> I disagree, I think you would have less engine braking with a lightened
> flywheel...
>
> When you downshift the engine wants to increase rpm.  With a lighter
> flywheel it will rev up faster right... so it gets up to a higher rpm with
> the lightened f/w ---> greater speed,
>
> or consider it this way...  with a heavier flywheel it takes more force to
> increase rpm, so more of the cars momentum is transfered into energy
stored
> in the flywheel... and more momentum is removed from the car..
>
> please don't bash my physics too hard, it was only my minor, and it's been
> years...
>
>
> Jason Adams
> Fahrvergnugen Forever!
>
> ----- Original Message -----
> From: "Dan Bubb" <jdbubb@ix.netcom.com>
> To: "Ken Bates" <indiana_red@hotmail.com>
> Cc: "'scirocco'" <scirocco-l@scirocco.org>; "Robert Piwonka"
> <tpiwonka@TTACS.TTU.EDU>
> Sent: Wednesday, March 27, 2002 11:40 AM
> Subject: Re: Lightened Flywheels
>
>
> > Wait a minute! Why would there be less engine braking?
> > The braking effect of the engine is not changed by lightening the
> > flywheel (since engine braking is a function of the engine trying to
> > pump air against a closed throttle) and the reduced inertia means the
> > engine revs will drop faster. As a matter of fact with the reduced
> > inertia there is less mass holding the engine revs up so the net effect
> > is slightly (very slightly) MORE engine braking.
> > Dan
> >
> > Ken Bates wrote:
> > >
> > > Oooohh,  That is a good pont.  I would not have thought of that.  This
> mod
> > > would be on my "list" the next time I do a clutch.    I am a
> "downshifter"
> > > when i am driving hard and this diminished effect would be missed.
> Thank
> > > you for bringing that up.
> > > Ken
> > > '79 Scirocco 16v project "McFly"
> > > '86 16v (parts car)
> > > VORTEX:  "Indiana Red"
> > >
> > > ----- Original Message -----
> > > From: "Robert Piwonka" <tpiwonka@TTACS.TTU.EDU>
> > > To: "Scirocco" <scirocco-l@scirocco.org>
> > > Sent: Monday, March 25, 2002 2:32 PM
> > > Subject: RE: Lightened Flywheels
> > >
> > > > on stock cams I noticed no difference in idle characteristics when I
> had
> > > the
> > > > Velocity lightened flywheel.  However donwshifts have less effect
ie.
> less
> > > > engine breaking and the car reved(sp) like a motorcycle ;)
> > > >
> > > > Robert Piwonka
> > > > 86 16V
> > > >
> > > > -----Original Message-----
> > > > From: scirocco-l-admin@scirocco.org
> > > > [mailto:scirocco-l-admin@scirocco.org]On Behalf Of Allyn
> > > > Sent: Monday, March 25, 2002 2:18 PM
> > > > To: Euroroc II; Brian Wagner; Scirocco-l@scirocco.org
> > > > Subject: Re: Lightened Flywheels
> > > >
> > > >
> > > > Heavy - slower acceleration, smooth idle
> > > > Light - lumpy idle, at an extreme you may have to raise idle speed
to
> > > > maintain idle without stall
> > > > Al
> > > >
> > > > ----- Original Message -----
> > > > From: "Euroroc II" <flaatr@yahoo.com>
> > > > To: "Brian Wagner" <scirocco_88_16v@hotmail.com>;
> > > <Scirocco-l@scirocco.org>
> > > > Sent: Monday, March 25, 2002 2:12 PM
> > > > Subject: Re: Lightened Flywheels
> > > >
> > > >
> > > > > So anyone want to clear up the pros and cons of lightening the fly
> > > wheel?
> > > > > I've got a good idea of the advantages and disadvantages but I'd
> like to
> > > > > get them confirmed.
> > > > >
> > > > > -Raffi
> > > > >
> > > > >
> > > > > At 12:07 PM 3/25/02 -0600, you wrote:
> > > > > >6 is extremely light, most of the lightened flywheels you buy are
> > > 8.3lbs
> > > > > >that might be a better bet.
> > > > > >
> > > > > >Brian
> > > > > >
> > > > > >
> > > > > >>From: "Sal Guzzo" <pellom@YorkU.CA>
> > > > > >>To: "Scirocco" <scirocco-l@scirocco.org>
> > > > > >>Subject: Lightened Flywheels
> > > > > >>Date: Mon, 25 Mar 2002 12:20:57 -0800
> > > > > >>
> > > > > >>Hi all,
> > > > > >>
> > > > > >>I wanna lighten my flywheel but I'm not sure how much to take
off.
> > > It's
> > > > a
> > > > > >>210mm flywheel for an 8V.  I think that it weighs about 12
pounds
> now
> > > > and I
> > > > > >>was thinking of having it reduced to about 6 pounds.  Is that
> kewl?
> > > > > >>
> > > > > >>TIA
> > > > > >>
> > > > > >>Sal
> > > > > >>
> > > > > >>
> > > > > >>_______________________________________________
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> > > > > >>Scirocco-l@scirocco.org
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> > > > > >
> > > > > >
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> > > > > >
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>
>
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References:
- Lightened Flywheels
  - From: tpiwonka@TTACS.TTU.EDU (Robert Piwonka)
- Lightened Flywheels
  - From: indiana_red@hotmail.com (Ken Bates)
- Lightened Flywheels
  - From: jdbubb@ix.netcom.com (Dan Bubb)
- Lightened Flywheels
  - From: roclist@accessconsulting.ca (Jason Adams)

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