[DeTomaso] twin disk street clutches

[adin at frontier.net]

I guess it would be too simple to call Don B and ask what clutches are  
used in the big motors.

Forrest????





Quoting JDeRyke at aol.com:

> FWIW- the biggest single reason NOT to use multi-disc clutches in a Pantera
> is, you simply cannot get enough clutch linkage travel to disengage   
> two discs;
> we can barely get enough to disengage one. Consider: on a given Pantera when
> checking thru the access hole in the bellhousing, you'll only be   
> able to get a
> 0.040" thick feeler gauge (if you're lucky!) between a single disc and
> flywheel. This means that each side of the clutch disc only clears   
> the pressure plate
> AND flywheel by a max. of 0.020" each- and those discs aren't perfectly flat,
> so we get 'some' clutch drag.
> Using dual discs with 4 friction surfaces, the clearances are reduced to
> 0.010" per disc per surface. Massive and expensive wear on ZF sychronizers
> results, unless huge changes are made in the slave cylinder bore   
> and/or the pedal
> ratio under the dash. On racing versions, this is taken care of by   
> rebuilding the
> tranny after each event.   Changing pedal ratios is difficult due to the
> tight clearances to the floor, while making the slave smaller to get  
>  more travel
> causes an impossibly stiff clutch for any sort of street driving. Again, it
> doesn't affect racers 'cause not much shifting is done in a typical   
> event. But in
> traffic- forget it! You'll be finding excuses to NOT take such a Pantera on
> club runs and         it turns into a dedicated racer.
> Maybe a power-clutch setup would make all this possible but it certainly
> ain't gonna be a bolt-in; possibly some extra bracing under the dash will be
> needed. Personally, I'd go to a clutch specialist shop and have a single-disc
> pressure plate custom-made to my best-guess strength needed, and try  
>  it out. It may
> take a few assemblies to both allow street driving and holding 2X the stock
> torque, but all this will pay off in le$$ ZF overhauling. FWIW,   
> street pressure
> plates are around 2000-lb units while 'racing' clutches are 2600-lb and will
> shorten your leg in a few hours of traffic! Good luck- J Deryke
>
>
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