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> Pedal set improvements- Now available in limited quantity., Clutch pedal shaft with ball bearing vs bushing
bdstone914
post Aug 27 2017, 10:11 PM
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Out of the couple hundred pedal set I have rebuilt it is obvious the smallest bushings were out the most. The one in the clutch arm often wears completely through an starts wearing the arm itself. This happens with both the plastic and bronze bushings. It is a bigger problem on later 911's as they use a longer arms and have stringer pressure plates that accelerates the wear. And for some 911 the clutch shaft is NLA. Thank you Porsche.
I have made a prototype arm that uses a ball bearing to replace the bushing. I have now found a 17mm x 6mm x 6mm skate board bearing that will work.
I have measured the pressure to depress the clutch and calculated the pressure on the bearing is about 25-50 lbs. The bearing are rated for over 500 lb so it should never fail.
I have also toyed with the idea of replacing the clevis pin with a pull type spring loaded ball stainless steel pin. The clevis pins are hard to remove when they wear and there is little to grip to pull them out.
The plan is to make new clutch shaft out of a heat treatable steel with the ball bearing design. Considering stainless for the shaft as the pedal sets often rust badly internally.
The arm portion would be made straight eliminating the dog leg to the arm. A Delrin spacer that is used on 911's would be used to on the shaft to take up the distance of the offset of the original part.
The distance C-C from the shaft to the bearing center could be changed to application with stiffer clutches ( like V8's ) Porsche varied this dimension starting with the SWB cars and made them longer up through the SC's. A shorter arm would give more clutch pedal modulation.
I used to weld up the elongated worn hole and reshape ti round. PITA. The the cost for a new arm with a bearing looks to be in the $20 range.


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turnaround89
post Aug 27 2017, 10:42 PM
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Id love to try this out on my subaru conversion. Not a bad price either. Any idea when they'll be available?

Keep up the great work
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Krieger
post Aug 27 2017, 10:47 PM
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Nice work Bruce!
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bdstone914
post Aug 27 2017, 10:48 PM
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QUOTE(turnaround89 @ Aug 27 2017, 09:42 PM) *

Id love to try this out on my subaru conversion. Not a bad price either. Any idea when they'll be available?

Keep up the great work


Probably a couple weeks. Is you car up and running Is the pedal hard to depress?
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Matty900
post Aug 28 2017, 01:03 AM
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(IMG:style_emoticons/default/first.gif) Nice work Bruce!
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michael7810
post Aug 28 2017, 06:31 AM
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Excellent work. Having you rebuild my pedals is on my long term list of stuff to do...not sure when but it will happen. Thanks for your support to the community.
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mgp4591
post Aug 28 2017, 08:26 AM
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You got the idea from playing with a Fidget Spinner, right?? (IMG:style_emoticons/default/w00t.gif)
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mb911
post Aug 28 2017, 08:37 AM
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I want one..
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bdstone914
post Aug 28 2017, 08:55 AM
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QUOTE(mgp4591 @ Aug 28 2017, 07:26 AM) *

You got the idea from playing with a Fidget Spinner, right?? (IMG:style_emoticons/default/w00t.gif)


I told my grandson it was a figet spinner. Now he want me to make one for him.
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mepstein
post Aug 28 2017, 09:27 AM
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Bruce, as soon as you make some, I'm a buyer. Thanks!
I'll also buy one with the longer clutch lever for my 915 conversion.
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bdstone914
post Aug 28 2017, 09:55 AM
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QUOTE(mepstein @ Aug 28 2017, 08:27 AM) *

Bruce, as soon as you make some, I'm a buyer. Thanks!
I'll also buy one with the longer clutch lever for my 915 conversion.


I will get some of the longer arm ones made up.
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IronHillRestorations
post Aug 28 2017, 10:14 AM
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(IMG:style_emoticons/default/smilie_pokal.gif) (IMG:style_emoticons/default/smilie_pokal.gif) (IMG:style_emoticons/default/smilie_pokal.gif)
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DRPHIL914
post Aug 28 2017, 10:20 AM
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an excellent improvement and solution to a common problem! (IMG:style_emoticons/default/drunk.gif)
I have a pedal set that id like to put one in, so one for me for sure!
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andys
post Aug 28 2017, 11:35 AM
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Bruce,

Nice work! Did you look at the clevis with the spring retainer available from McMaster-Carr?
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bdstone914
post Aug 28 2017, 01:34 PM
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QUOTE(andys @ Aug 28 2017, 10:35 AM) *

Bruce,

Nice work! Did you look at the clevis with the spring retainer available from McMaster-Carr?
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No, but that is like the original one that is hard to remove it it is worn. I it is used with the bearing it should not were either way. I think it would be easier to have a straight pull pin.
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Elliot Cannon
post Aug 28 2017, 02:19 PM
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Nice improvement Bruce. Put me down for one.
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Kansas 914
post Aug 28 2017, 02:21 PM
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QUOTE(Elliot Cannon @ Aug 28 2017, 02:19 PM) *

Nice improvement Bruce. Put me down for one.

(IMG:style_emoticons/default/agree.gif)

I need at least one - assembly is commencing on the Willow car now that the flared car is finished.
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whitetwinturbo
post Aug 28 2017, 09:14 PM
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Bruce, we are not worthy... (IMG:style_emoticons/default/pray.gif) (IMG:style_emoticons/default/pray.gif) (IMG:style_emoticons/default/pray.gif)

.........I want for my v8 (IMG:style_emoticons/default/wub.gif)
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euro911
post Aug 28 2017, 09:40 PM
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Nice innovative thinking, Bruce (IMG:style_emoticons/default/beerchug.gif)

I had to go with a different size bushing when I changed to the hydraulic system. I'll measure the bushing's ID, but also wondering if there's a possibility of sourcing a bearing with the correct ID I'll need. (IMG:style_emoticons/default/confused24.gif)
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Elliot Cannon
post Aug 29 2017, 09:31 AM
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OK Bruce, get off the computer and get to work on these. (IMG:style_emoticons/default/biggrin.gif)
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