[DeTomaso] twin disk street clutches

[David in Durango]

Bwahahahaha - I've ridden in this car.  No need to clutch it, just lean into 
the gas a little and "Boy, the streets are slick!"

thanks,

David
----- Original Message ----- 
From: <forestg at att.net>
To: <detomaso at realbig.com>
Sent: Monday, May 12, 2008 8:18 PM
Subject: Re: [DeTomaso] twin disk street clutches


>I have the same clutch that was on the cleveland which is the 10 1/2" 
>centerforce from Hall. Remember though that I don't drive like Mad Dawg and 
>I only have 615 lbs/ft of torque.
> Forest
> -------------- Original message from 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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