[DeTomaso] Flywheel recommendation-long

adin at frontier.net adin at frontier.net
Sun Jan 20 16:56:41 EST 2008


I have a car w/ a quartermaster 7" race clutch - its wonderful, no  
make that orgasmic, at speed.  Just about impossible in town.

Consider carefully.

David in Durango


Quoting JDeRyke at aol.com:

> In a message dated 1/20/08 7:24:16 AM, wkooiman at earthlink.net writes:
>
>> By the way, while the (Fidanza) flywheel is very light, the pressure plate
>> is not. I have it all apart right now.  I'll put everything on a scale and
>> post the results.
>>
> When fiddling with my 16-lb aluminum flywheel, I weighed an OEM Long clutch
> and got 16 lbs. Then I weighed a Centerforce and also got 16 lbs.   
> The friction
> discs are virtually identical. I'm interested in what weights you find, Will.
>>
>> ...What I really want to try is a small dual disc circle-track type clutch.
>> I know at least one person that is running Dennis Quella's racing dual-disc
>> on the street.  He doesn't have any problems with
>> it.  There's no chatter, and it doesn't bog.
>>
> Chatter and bogging are not the problem. The separation distance for a single
> clutch disc in a stock Pantera clutch setup is barely 0.040"- that is, 0.020"
> on each side of the supposedly free-spinning disc which   has a 'crush
> thickness' and wobbles. Adding a second disc means that the   
> separation of each
> friction surface is now half what a single disc has- and that was   
> marginal to begin
> with, unless you re-engineer the hydraulic system or the pedal ratio- or both
> at the same time. Even a long-throw slave doesn't truely give enough
> separation on most stock systems. Less disc separation means more   
> drag on your ZF
> synchros each time you shift- and we all know how expensive THAT   
> wear is to repair
>
>
> Dual-disc clutches are really meant for big engines with enormous torque that
> a single disc just cannot hold, or for pro-racing so one can run a small
> flywheel and lower the whole powertrain without a big flywheel   
> dragging on the
> ground. Real racecars use 5" dual or triple-disc clutches with the   
> oil pan 2" off
> the ground for a lower center of gravity. I'm told the commercial dual disc
> setups for Panteras (and 454 Corvettes) iare simply two std 11"   
> discs on a std
> dia flywheel, so engine lowering isn't possible.
>
> IMHO, a modern racing Pantera would likely be running a GT-40/Mangusta-type
> 6-speed ZF which will lower the powertrain some 4" for better handling. The
> only street DeTomaso on which a dual-disc clutch & smaller flywheel   
> really makes
> sense is the Mangusta- which in stock form with 50-series tires does  
>  sometimes
> drag its 157-tooth flywheel. But a 5" or 5-1/2" dual disc sprint-car system-
> good for 700 bhp- costs around $2500, so I've yet to meet a 'Goose owner
> interested at that level. A small diameter flywheel automatically means a
> relocated, reverse-running starter strapped alongside the ZF in a   
> custom bellhousing,
> and a custom oil pan with custom engine & ZF mounts. There's probably more
> special parts needed that I haven't thought of. I'd be glad to help   
> if someone
> really wanted to dig into such a neat engineering project- at your   
> garage & on
> your car, not ours! FWIW- J DeRyke
>
>
>
>
>
> **************
> Start the year off right.  Easy ways to stay in shape.
>
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