[Fot] History's Mysteries...Spitfire Duel Master Plumbing...

[Ashley Page]

Problems with that twin master cyl set up:

 1. Using flange mount cylinders like that system, there has to be a pivot (spherical bearing, trunion or similar) in the pedal where the bar passes thru to allow for the different push rod travel distances that will occur during breaking. Hard to tell in the picture; there may be a pivot on the bar in the pedal, can’t tell. 

2. The restriction placed on the heim joints by the large washers on each side of each heim will be a problem if or once the bar in that pedal can pivot. 

Every application with twin cylinders and a fixed bar in the pedal that cannot pivot uses a balance bar at the other end of the master cylinders (cylinder bodies have a bearing in the end opposite the push rod)

Sent from my iPhone

> On Dec 16, 2017, at 11:29 AM, Bud Rolofson via Fot <fot at autox.team.net> wrote:
> 
> The heim joints look adjustable if the corrosion isn't too thick.
> 
> Sent from my Commodore 64
> 
>> On Dec 16, 2017, at 7:55 AM, John Styduhar via Fot <fot at autox.team.net> wrote:
>> 
>> ​I don't see any adjustment on the "balance bar" so I think it's there just to connect the two master cylinders to the brake pedal.  And since Brad said there was a proportioning valve, a balance bar isn't necessary. ​
>> 
>> 
>>> On Fri, Dec 15, 2017 at 10:09 PM, Duncan Charlton via Fot <fot at autox.team.net> wrote:
>>> Set up as in the photo the balance bar could bend or fracture if the pedal is pushed hard enough.  If the unused master cylinder is filled with fluid its piston will not move at all so the balance bar between the two MC’s will be put under a lot of bending stress when the pedal is pushed — one piston moves and the other one doesn’t, and the pedal would move a lesser distance than if both cylinders are being used.  If the unused MC is empty, the piston will easily bottom out, putting stress on the cross balance bar for the same reason as the other scenario.  Since the pedal would move a much greater distance with no fluid in the unused MC, I assume it was left filled.  Come to think of it, though, leaving the right ratio of air and fluid in the unused MC would allow it to behave like a spring and put a normal level of stress on the balance bar.
>>> 
>>> Duncan
>>>   
>>> 
>>>> On Dec 15, 2017, at 2:21 PM, Brad Eells via Fot <fot at autox.team.net> wrote:
>>>> 
>>>> Hi Gang,
>>>> 
>>>> I am trying to understand what may have happened with the duel master set up and it's plumbing. 
>>>> 
>>>> The front and rear circuits are both coming out of the right hand cylinder while the left hand cylinder is returning to itself. The car does have a prop valve for the rear brakes located in the cockpit.
>>>> 
>>>> One person suggested the the driver may have had a problem during a race weekend and simply re-plumbed to make it through a race weekend. The car was last raced in Sept 1976.
>>>> 
>>>> Should a line for each circuit simply go to each master cylinder? I have 2 new ones on order.
>>>> 
>>>> Your thoughts are appreciated!
>>>> 
>>>> 
>>>> Brad
>>>> 
>>>> Brad Eells
>>>> Chino CA
>>>> #35 DP 1962 Triumph TR4
>>>> #76 FP 1969 Triumph Spitfire Mk3
>>>> 1965 Triumph TR4A IRS...for the road!
>>>> 
>>>> <BCE_0044 (Large).JPG>
>>>> <BCE_0046 (Large).JPG>
>>>> ​
>>>> 
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>>> 
>>> 
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