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Lightened Flywheels

Subject: Lightened Flywheels
From: rept@qwest.net (Mike Blain)
Date: Thu, 28 Mar 2002 08:31:40 -0500
References: <20020327205907.16811.qmail@web10301.mail.yahoo.com> <3CA2145A.1020506@qwest.net> <3CA309E8.6401C27E@ix.netcom.com>

Yeah?  someone tell that to the Porsche. But i doubt she'll pay 
attention. And this is not an individual trait- according to the 
Rennlist inhabitants.  However, actual cause being from flywheel is 
arguable.

Dan Bubb wrote:

> If an engine has a very heavy flywheel it will have a large effect on
> the speed of the car if the revs are not matched correctly since a lot
> of energy is transfered from the car to the flywheel to speed up the
> flywheel. With a light flywheel litte energy is required to speed it up,
> so a lighter flywheel requires LESS precision in matching revs to shift
> smoothly.
> Dan
> 
> Mike Blain wrote:
> 
>>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
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>_______________________________________________
>>>>>>>>>Scirocco-l mailing list
>>>>>>>>>Scirocco-l@scirocco.org
>>>>>>>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>>>>>>>
>>>>>>>>>
>>>>>_________________________________________________________________
>>>>>
>>>>>
>>>>>>>>Chat with friends online, try MSN Messenger:
>>>>>>>>
>>>>>>>>
>>>>http://messenger.msn.com
>>>>
>>>>
>>>>>>>>_______________________________________________
>>>>>>>>Scirocco-l mailing list
>>>>>>>>Scirocco-l@scirocco.org
>>>>>>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>>>>>>
>>>>>>>>
>>>>>>>_________________________________________________________
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>>>>>>>Get your free @yahoo.com address at http://mail.yahoo.com
>>>>>>>
>>>>>>>
>>>>>>>_______________________________________________
>>>>>>>Scirocco-l mailing list
>>>>>>>Scirocco-l@scirocco.org
>>>>>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>>>>>
>>>>>>>
>>>>>>_______________________________________________
>>>>>>Scirocco-l mailing list
>>>>>>Scirocco-l@scirocco.org
>>>>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>>>>
>>>>>>
>>>>>>_______________________________________________
>>>>>>Scirocco-l mailing list
>>>>>>Scirocco-l@scirocco.org
>>>>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>>>>
>>>>>>
>>>>>>
>>>>>_______________________________________________
>>>>>Scirocco-l mailing list
>>>>>Scirocco-l@scirocco.org
>>>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>>>
>>>>>
>>>>_______________________________________________
>>>>Scirocco-l mailing list
>>>>Scirocco-l@scirocco.org
>>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>>
>>>>
>>>
>>>=====
>>>Cheapass Ron
>>>"Victor" '87 16V Scirocco
>>>"Teufelhasen" '93 Cabby <-For sale
>>>
>>>If it ain't foggy, TURN OFF YOUR FOG LIGHTS.
>>>
>>>__________________________________________________
>>>Do You Yahoo!?
>>>Yahoo! Movies - coverage of the 74th Academy Awards®
>>>http://movies.yahoo.com/
>>>
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>>>Scirocco-l@scirocco.org
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>>>
>>>
>>>
>>>
>>_______________________________________________
>>Scirocco-l mailing list
>>Scirocco-l@scirocco.org
>>http://neubayern.net/mailman/listinfo/scirocco-l
>>
> 
> _______________________________________________
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> Scirocco-l@scirocco.org
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> 
> 
>

Follow-Ups:
- Lightened Flywheels
  - From: jdbubb@ix.netcom.com (Dan Bubb)

References:
- Lightened Flywheels
  - From: rapieper@yahoo.com (Ron Pieper)
- Lightened Flywheels
  - From: rept@qwest.net (Mike Blain)
- Lightened Flywheels
  - From: jdbubb@ix.netcom.com (Dan Bubb)

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