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Heavy-Duty long-Arm Clutch-Shaft??
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modok
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PostPosted: Fri Sep 03, 2021 5:13 pm    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

I've never dealt with that particular combination of things, but yeah I think you have the right idea.
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clonebug
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PostPosted: Fri Sep 03, 2021 7:52 pm    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

My pan is a 64.....I installed a stamped steel pedal assembly so I could use the CB Performance Turbo aluminum pedal instead of the roller pedal.
I'm not sure what throw it has but I ran a Stage I PP without issues on a stock throwout arm for many years.

Once I powered through that PP I had the throwout arm lengthened to 100 mm and installed a Stage II PP.
I had to shim the Stage II out .031" to get enough grip to hold the power output but pedal throw and effort are not much different than stock arms and a Stage I.
Kennedy discs don't seem to like a whole bunch of throw so it works out good.
I did have to make sure I push the clutch lever to almost a full stroke but that only took a little while to get used to.

With your hybrid setup you might have to add to the pedal side to get what you need for throw. either that or go back to a stock throwout arm and see if the pedal effort is too much or not.
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oprn
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PostPosted: Sat Sep 04, 2021 5:16 am    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

That picture puts a whole new light on it! Ya, other than building your own longer and stronger arm on the peddle end... or go hydraulic...
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panel
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PostPosted: Sat Sep 04, 2021 9:10 am    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

Clatter wrote:


The longer arm at the clutch pedal shaft makes the pedal harder to push,

Leverage thing...


Doesn't it make it easier to push ?
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PostPosted: Sat Sep 04, 2021 9:37 am    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

panel wrote:
Clatter wrote:


The longer arm at the clutch pedal shaft makes the pedal harder to push,

Leverage thing...


Doesn't it make it easier to push ?

I believe so... went over it on the first page.

Also I was going to add... I kinda go back on what I suggested earlier as far as wanting to maybe lengthen the pedal shaft arm to get more throw and make the pedal require less leg strength to push. I took the car for a drive and I realized it actually works very well and I like it. It's a stiff pedal but I don't have to push it far to engage (nice for quick shifting) and I can also shift very smooth if I want. I only have to push the pedal about 2-3" and the clutch is already out.

The earlier style pedal shaft and long throw out arm combination seems to work well, is what I'm saying. You could try to duplicate the geometry in a sense based on how long your current throw out arm is compared to the Type 1 style, then decide the pedal arm length accordingly.

Also, is a fast back pedal (the actual pedal cluster arm) longer or shorter than a bug pedal cluster? Maybe that's part of the puzzle here?

If you do lengthen the pedal shaft arm it would be easy to redesign it to use a bushing pivot point instead of hook for the cable end, basically copy the CPB upgrade kit.
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MrGoodtunes
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PostPosted: Sat Sep 04, 2021 10:34 am    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

evanfrucht wrote:
panel wrote:
Clatter wrote:


The longer arm at the clutch pedal shaft makes the pedal harder to push,

Leverage thing...


Doesn't it make it easier to push ?

I believe so... went over it on the first page ...


What you wrote on 1st page certainly applies to the throw-out shaft arm:
evanfrucht wrote:
... a longer lever takes less force to push/pull but needs to be moved a greater distance to do the same amount of work ...


But, it's different for the pedal shaft arm. The longer the distance from pedal shaft axis to hook, the less your leg has to move the clutch pedal. So with a longer hook arm, you're doing all the work by pressing pedal thru a shorter distance; hence, requires more force, feels stiffer.

You wouldn't need a longer hook arm for your ride @evanfrucht, but it may be exactly what OP @Clatter needs.
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evanfrucht
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PostPosted: Sat Sep 04, 2021 11:19 am    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

I was actually thinking about that after writing what I wrote and trying to visualize it. It becomes different when you have two levers working together... You've explained it well. Clatters problem may be that the Porsch throw out arm is too long... So therefor he needs a longer arm at the cluster to make the ratio proper again. In theory, he could also shorten the throw out arm to get the added travel he needs... atleast I think! Anxious
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MrGoodtunes
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PostPosted: Sat Sep 04, 2021 12:18 pm    Post subject: Re: Heavy-Duty long-Arm Clutch-Shaft?? Reply with quote

evanfrucht wrote:
... he could also shorten the throw out arm to get the added travel he needs...


Yes, and that may be an easier way to go when you consider the possibility that a longer hook arm may pull clutch cable up against top of its tube, which could eventually cut thru the tube. Might help to bend front end of cable tube upward?
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