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Username Post: Info on lightest clutch pedal possible        (Topic#361408)
vabeach56wagon 
Valued Contributor
Posts: 3144
vabeach56wagon
Loc: Chesapeake,VA,
Reg: 04-22-02
06-17-20 08:52 AM - Post#2796572    

I know it's not the '56 wagon but I need your help. We are looking to install a maximum force clutch in my daughter's 69 Z28. Because of a severe injury to her lower left leg, the car is very, very uncomfortable for her to drive but she wants to be able to enjoy the car in its 4 spd configuration (M22 - 4.10 posi).



We are putting in a newly-built date/numbers matching 302DZ to replace the incorrect 302 in the car now. Original clutch is 10.5, 10 spline. The flywheel was resurfaced and balanced just a short time ago so we'd like to retain it.

Please recommend a suitable assembly. We're considering the dual disc Centerforce but need input from folks who know a lot more than we do.

Thanks

psf

Original builder of the Gobstomper - '56 210 9 passenger wagon now in other's hands. Current Ride is '69 X33D80 Z28 Camaro



 


wagonman100 
Site Ambassador
Posts: 15187

Loc: Baltimore, MD
Reg: 11-27-04
06-17-20 01:34 PM - Post#2796596    
    In response to vabeach56wagon

Sorry to hear your daughter got injured. Good that she still wants to keep the car a stick though. There are probably a lot of people on here that know more about this subject than I do, but my suggestion would be to consider going to a hydraulic clutch setup. All stick cars for years have had them and they are much easier to drive than the old iron.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
Rick_L 
Member #409
Posts: 27853
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
06-17-20 05:15 PM - Post#2796603    
    In response to wagonman100

A hydraulic clutch isn't going to be any different from a mechanical linkage as long as the clutch pedal travel is the same. At least provided both work as intended. This is a matter of leverage - if you want less pedal force you have to have more pedal travel. You only have so much room to provide that, and your leg and body can only accommodate about what's there anyway.

The stock clutch assist spring is an over center device and helps reduce pedal effort when the pedal is depressed more than halfway. But its effect is somewhat minimal. If it were made stronger the pedal would want to stick on the floor too.



 
vabeach56wagon 
Valued Contributor
Posts: 3144
vabeach56wagon
Loc: Chesapeake,VA,
Reg: 04-22-02
06-18-20 06:08 AM - Post#2796645    
    In response to wagonman100

We have considered going hydraulic clutch however this is an original x33D80 Z28 and we would like to retain the visual "correctness" aspect of the car. Drivetrain mechanical internals are not at all stock but all elements otherwise remain as original in appearance as is humanly possible.

New 302DZ engine (block and heads were cast in May '69 - car built in June '69) has Eagle forged crank and rods, JE forged .030 over 11-1 pistons, Comp regrind of the factory 30-30 cam and the heads have screw-in studs and pushrod guides, comp roller tip steel rocker arms...the M22 is a new build transmission but is date and stampings correct.

Rear posi is not factory, nor is ring/pinion. All new.

Clutch linkage has to remain.

paul

Original builder of the Gobstomper - '56 210 9 passenger wagon now in other's hands. Current Ride is '69 X33D80 Z28 Camaro



 
japete92 
"7th Year" Silver Supporting Member
Posts: 1639
japete92
Loc: No. Virginia
Reg: 01-18-13
06-18-20 12:22 PM - Post#2796671    
    In response to vabeach56wagon

The below may be donkey doo. But it makes some sense to me.

Take a look thru this topic:

https://www.chevytalk.org/fusionbb/showtopic.php?t...

The clutch with the 'short' diaphragm fingers might (logically should) have a 'lighter' pedal. The diaphragm spring should be 'lighter' than the 'long' fingered versions. It won't 'perform' like a 'proper' one, but it may work if not ridden hard.

It's been a LOOOOOONG time since I drove one of those 'short' type clutches (50+ years) and I do not remember enough to make any reliable comparisons.

One of the guru's on manual trans missions is DZAUTO. Perhaps he can provide reliable info on your problem. Send him a PM; he helped me on a different issue.


Pete



 
BOB_SPRADLIN 
Contributor
Posts: 468
BOB_SPRADLIN
Loc: Saginaw, Michigan USA
Reg: 04-08-02
10-05-20 05:22 PM - Post#2804913    
    In response to japete92

Im running a Dual Disc Centerforce and it is quite easy to depress the the clutch pedal. Hope his helps.

Bob



 
56sedandelivery 
Gold Supporting Member
Posts: 5917
56sedandelivery
Age: 69
Loc: Everett, Wa.
Reg: 02-26-08
10-06-20 09:09 AM - Post#2804957    
    In response to vabeach56wagon


Seems to me there are TWO holes drilled in the clutch pedal to adjust for the amount of effort to depress the pedal; a leverage thing if you will. You're probably on the right track with a dual disc clutch however. Any "Camaro" sites on the web? I'm sure there are, but since I've never owned a Camaro, I've never looked. AND, I'm still sorry you sold the 56, 210, Townsman, Wagon, especially after all the work you put into it. That was a nice car!!
I am Butch/56sedandelivery.




 
Rick_L 
Member #409
Posts: 27853
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
10-06-20 12:50 PM - Post#2804969    
    In response to 56sedandelivery

A couple of things here, and these are speculation/opinion on my part.

If a 69 Camaro has two holes for different clutch pedal ratios, the one usually used by the factory would be the "easy" one, the other would be for a "fast" pedal with reduced travel - the opposite of what you want. The 67 I had did not have that feature. GM cars of those years did have a second hole for the brake pedal. The low travel/high force alternative was for power brakes, which more than made up for the increased force required from the pedal ratio.

As for the dual disc clutch, the diaphragm pressure plate version of those doesn't appear to be any different from the single disc versions, so I think it's unlikely that it has less pedal force required. I would agree that the old school flat diaphragm pressure plate such as the factory used in the 50s would have less pedal force required. Also less clamping force to hold engine torque.





 


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