[DML] Re: Clutch pedal pressures

["Dave Swingle" <swingle@xxxxxxxxxxx>]

No specific data, but several observations from having worked on a 
bunch of them..

I've run into cars (including mine) where the pressure was much 
higher. This seemed to relate to lack of grease at the clutch fork 
pivot ball, and lack of grease on the throwout bearing. If you have a 
very low mileage car with an excessively stiff clutch this is 
probably the issue. 

Many modern cars have a "helper spring" on the clutch pedal itself 
that gives an "over centering" assist after the pedal is pushed about 
1/3 of the way down. I removed such a spring on my kid's Subaru 
because it made the car difficult to launch smoothly due masking the 
feel of the clutch engaging. The clutch is notably stiffer but much 
easier to modulate. Still very light though compared to the DMC. I've 
seen the same spring setup on most Japanese cars and BMWs. 

Dave Swingle


--- In dmcnews@xxxxxxxxxxxxxxx, tobyp@xxxx wrote:
> Hello List - We received an inquiry from somebody regarding the 
> appropriate amount of force that should be necessary to push in the 
> DeLorean clutch pedal.  Anyone who has driven a long parade in a 
> DeLorean knows that the effort is fairly high as compared to 
> a "modern" car.  Well, in order to give this person a definitive 
> answer, I actually measured my pedal.  Using some highly 
specialized 
> equipment (bungee cord, 4X4 block of wood, and a digital bathroom 
> scale) I have the following results for Winged1.  This car has a 
> several years old Centerforce clutch setup (with the 
counterweights, 
> although the car wasn't running during this experiment), reasonably 
> fresh master and slave cylinder, stainless steel braided line, 
> adjustable pedal linkage, and uses Valvoline Synthetic DOT 4 
fluid.  
> The initial push was about 12 - 15 pounds, and ramped up to 27 - 28 
> pounds when the clutch diaphragm started to release.  These values 
> were fairly consistent over a half-dozen tries (without pushing the 
> pedal all the way to the floor).  Does anybody else have any data 
> that they would like to share on this topic?
> 
> Toby Peterson  VIN 2248 "Winged1"
> DeLorean Parts Northwest, LLC
> www.delorean-parts.com




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