[DeTomaso] clutch?

[Ken Green]

Goran,
 
    I think you would have to integrate over the firction material radius to compute how much torque the disk can handle in the staic case where the clutch is not slipping.  It should be something like the integral from R1 to R2 of coesffient of friction times clampling force times 2pi times r  times dr?  all times the number of friction surfaces, 2 for a single disk and 4 for two disks?  Or something like that.
 
    I have Tom Monroes acient book on clutches, and will try to see if he as a formula.
 
    I think the answer is that for high HP and light clutch, you need twin disks.  McLeod claims their twin disk clutches need 1/2 inch for full disengagement.  With thier hydraulid throwout and a 3/4 dia MC, that comes out to 1 inch MC, which isn't too bad.  The Pantera pedals are 4.X to 1, a Wilwood clutch pedal assembly is 6.25 to 1.
 
Ken

--- On Wed, 11/26/08, Göran Malmberg <hemipanter at hemipanter.se> wrote:

From: Göran Malmberg <hemipanter at hemipanter.se>
Subject: Re: [DeTomaso] clutch?
To: JDeRyke at aol.com, detomaso at realbig.com
Date: Wednesday, November 26, 2008, 11:17 PM

Holding power is a bit tricky to calculate, we need a number of inputs to 
get a representative number. Clutch diameter, type of friction iron,
coefficient
of friction for the disc, clamping force and further more physical dimensions 
to fit the aplication.
But I should see if I can come up with some sort of simple formula for a rough
holding power number based on such unspecific things as "sinter",
"organic",
taken for garanteed that those materials have about the same numbers for 
different brands. Also, the steel used for friction should also be roughly the
same.
Then we need diameter, clamping force and number of discs/material for inputs. 

In our case we also need to know rotational inertia for both the disc (for the
cyncros)
and total asembly for the engine as such even if that is another story from
friction.

I was looking at this right now as I are tying to find a more street friendly
clutch
than my 8" sinter race solid disc unit.

I know that the standard long clutch will not handle my Tq, so I have ordered a
11"
3000 p unit. I should start of with an organic disk with stiff shock springs to
see
how it turns out. I search for smoth engagement but dont really care if pedal 
pressure is high. 
Goran
  ----- Original Message ----- 
  From: JDeRyke at aol.com 
  To: hemipanter at hemipanter.se ; detomaso at realbig.com 
  Sent: Thursday, November 27, 2008 3:13 AM
  Subject: Re: [DeTomaso] clutch?


  Goran, I'd heard years ago that a pressure plate suitable for a V-8 on th
street was an 1800-lb unit, a 2200 psi was 'performance' and a 2600 lb
'racing' unit had too stiff a pedal for the street. Now I'm trying
to rig up a way of checking the clamping-force of a given clutch, using my
hydraulic press and a scales. Any suggestions? Cheers- J DEryke


  **************
  Life should be easier. So should your homepage. Try the NEW AOL.com.
(http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom00000002)

_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso