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Old 11-05-2017, 09:19 AM   #2761
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Still Tinkering & Sketching --- As I previously mentioned, sorting out how to convert the existing hydraulic actuation of the master cylinder to pure mechanical has kept me busy the past few days. I have tossed out a number of ideas but think I may be close now.


One of my main objectives is to resolve this issue while having to alter/throw out the fewest number of existing parts. Having spent months fabricating nearly all of them from scratch, I do NOT wish to abandon any more than absolutely necessary. This particular solution calls for only removing the hydraulic clutch master (which I did not make) and then replacing it with a system of three heavy duty bell cranks and steel shafts. I will have to machine a couple of pieces but have a connection that I believe will work with me on them.

We'll soon see.
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Old 11-05-2017, 12:28 PM   #2762
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Hey Tango, thanks to WanderWoman I am sending this post from my new phone using Tapatalk!

Would it be possible to substitute a dual action master cylinder from a small import --- that would give you the extra safety you need. Jack

P.S. now that I've finished up my Retrobird and gotten the hang of Tapatalk there will be no end to my disturbances. I'll even post pics. Take that Photosket!


Sent from my LG-M255 using Tapatalk
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Old 11-05-2017, 04:27 PM   #2763
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Oooh! I want THAT car!
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Old 11-05-2017, 05:48 PM   #2764
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WOW Jack! Come on...is that for real!? --- Would make a mighty sweet Toad except it needs a paint job to match Rosebud. Maybe something with some tasteful flames?

The Corvette master is one of the few that moves enough fluid to take care of the big four wheel disks I now have. Anything smaller was not considered based strictly on volume. And it is big. I also wanted to use the bracket I already have made for it that sits along side the frame/fishplate so...this will be a fairly complicated set of pushrods. Not really all that bad but three bellcranks do have to be fabbed to make it all work.
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Old 11-06-2017, 11:07 AM   #2765
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Quote:
Originally Posted by Tango View Post
Still Tinkering & Sketching --- As I previously mentioned, sorting out how to convert the existing hydraulic actuation of the master cylinder to pure mechanical has kept me busy the past few days. I have tossed out a number of ideas but think I may be close now.

One of my main objectives is to resolve this issue while having to alter/throw out the fewest number of existing parts. Having spent months fabricating nearly all of them from scratch, I do NOT wish to abandon any more than absolutely necessary. This particular solution calls for only removing the hydraulic clutch master (which I did not make) and then replacing it with a system of three heavy duty bell cranks and steel shafts. I will have to machine a couple of pieces but have a connection that I believe will work with me on them.

We'll soon see.
Tango- Saw your earlier post about the brake master cylinder and was going say...how about a bellcrank?

Dodge and Chevy Vans in the 70s had a 90* brake booster

1975-DodgeB303-630x470.jpg

Jeff's Bronco Graveyard offers a brake booster upgrade for broncos that has ~45* bracket through the firewall.

extbooster.JPG

Lots of hot rod 90* set up for under dash brake booster/master upgrades.

Perhaps some inspiration?
scotts-underdash-single-dimension.jpg

90 booster.png
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Old 11-06-2017, 11:34 AM   #2766
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Quote:
Originally Posted by Tango View Post
Still Tinkering & Sketching --- As I previously mentioned, sorting out how to convert the existing hydraulic actuation of the master cylinder to pure mechanical has kept me busy the past few days. I have tossed out a number of ideas but think I may be close now.


One of my main objectives is to resolve this issue while having to alter/throw out the fewest number of existing parts.
We'll soon see.
How about moving the motor up a few inches.

Beautiful drawings- what program did you use?


Somebody mentioned a booster off of a P42 stepvan might work (nevermind- something else). I like off the shelf for brake stuff ideally.

DSCN8655-L.jpg
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Old 11-06-2017, 01:14 PM   #2767
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Guido...I looked at a few 90 degree set ups, but my hydro boost master is just too danged big to cram in anywhere except down on the frame. The only other space available is way up under what is left of the cowl and would be a monster to get to as well as calling for adding a lot more structure to carry it.

Rusty...the Program is called 2B. But it does come with an eraser.
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Old 11-06-2017, 01:40 PM   #2768
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so is the issue just no room for the hydraulic actuated solution? or just that you want to mechanically actuate your master cylinder for fear of hydraulic failure?

-Christopher
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Old 11-06-2017, 03:44 PM   #2769
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Both Christoper. I only came to use the clutch system because there was no room to put the hydro boost anywhere under the hood and at the time did not see any way for it to be mechanically operated. But since getting it in, I have decided that relying on that single piston/seal to work everything is simply a bad idea and went back to the drawing board for one more try.

I'm not a big fan of doing things twice, but in this case I'm think I'm making the right call. Gonna run the plans by a buddy here who is a serious builder (NASCAR, NHRA, Big dollar customs) to see what he thinks. I'll need him to do the machining anyway.
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Old 11-06-2017, 05:18 PM   #2770
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Just realized they used my bus to take young Forrest Gump to school.


Well...not MY bus, but one with the same body. Course the same body was made from 1941 thru early '47 so there were a lot of them around. And the one in the movie looks to be in excellent shape.
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