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Lightened Flywheels

Subject: Lightened Flywheels
From: amalventano1@comcast.net (Allyn)
Date: Wed, 27 Mar 2002 15:22:16 -0500
References: <OIEBJHGPLJOEEBIBNEEACEHNCCAA.tpiwonka@ttacs.ttu.edu><OE51zdDW6lCPx33E1io000190b7@hotmail.com> <3CA2204A.2DFE3F6F@ix.netcom.com><001601c1d5cc$08ca87e0$1401a8c0@Jason>

lighter flywheel is kinda more/less engine braking
1    after a downshift, you let out on clutch and if you havent matched rpm, the heavier flywheel
will slow you down more (only during the 'letting out on clutch' act).
2    once in the gear with the clutch out, the engine is matched to car speed, the flywheel acts as
part of the cars inertia, and the heavy flywheel mass is hurting you (since it doesnt want to slow
down).

    lighter flywheel wont hurt you (on the first part) in terms of if you are the type of person
that installs a lightened flywheel, chances are you match rpm's on a downshift.
    lighter flywheel will help on the second part as the engine has less to drag down with it.
Al

Allyn Malventano, ETC(SS), USN
87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original clutch, driveshafts, wheels :)


----- 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 3:14 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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> > > > > >
> > > > > >
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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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