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Lightened Flywheels
I believe that the lighter the flywheel the more you'll have to match
RPMs to downshift- case and point being my 928 which has the lightest
flywheel ive ever seen (it's a thin piece of tin). I have to gas it and
match RPMs (called heel/toeing) to drop a gear smoothly for
acceleration. There is little effect from engine braking.
Ron Pieper wrote:
> I disagree...engine braking would be hindered by NOT having the
> flywheel helping to maintain the existing RPM. Having the engine
> quickly drop revs *decreases* the effect of engine braking - it would
> provide little resistance. Example: imagine a massive flywheel - 5'
> diameter - ...if you have a given car speed, and drop a gear and
> release the clutch, your engine braking effects will be significant
> since the engine *won't* easily change revs to match the car/gear. If
> you have a tiny flywheel, the engine RPM can more easily change,
> reducing the effects of the engine's braking on car speed. It's not
> the speed of the engine that provides braking, it's the engine's
> resistance to a change in speed (it's rotating mass, of which the
> flywheel is a part).
>
> Now, OTOH, engine braking is not something I do or recommend...I have a
> tool for that, it's the brakes!
>
> Ron
>
> --- Dan Bubb <jdbubb@ix.netcom.com> wrote:
>
>>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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>>
>>>>>>
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>>>>>>
>>>>>
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>>>>>
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>>>>
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>
>
> =====
> Cheapass Ron
> "Victor" '87 16V Scirocco
> "Teufelhasen" '93 Cabby <-For sale
>
> If it ain't foggy, TURN OFF YOUR FOG LIGHTS.
>
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