Bob, I understand your concern for originality, and safety, and you have
some good points.
But, putting the booster on a Tandem MC, a Dual MC is 2 side by side, on
the front only will over power the front brakes, and in a panic or
emergency stop, the rears will never come on and the front will just
lock up.
It is a system, and is designed to work together.
Increasing the MC bore will decrease the pressure in the system, harder
to stop, and decrease the pedal travel. The formula is:
P=FxL/A
P=system pressure
F= brake pedal force
L=brake pedal linkage ratio
A= area of MC bore
The Tiger pedal ratio, L, was 4:1 for the Tiger boosted brakes vs a 6:1
for non boosted brakes. So with 70 lbs on normal hard braking, you have
280 lbs plus the booster pressure, and on non boosted brakes with 6:1
you have 420 lbs to activate the MC. Without the booster you are down
42 % in pressure to the brakes, therefore harder to stop.
There are lots of items to look for when designing or redesigning a
brake system, and you can try and find out or, read the Brake Handbook
by Fred Puhn.
This is a good primer to learn what you are doing, and then you can
start to experiment with sizes, or you can just experiment.
Larry, 6 years and still learning.
PS - Tom if the brake bleed screws are on the left, will they hit the
clutch MC, or can you use them? Mmmmmmm. BTW, Dave Bean is very good
for fittings on different brake treads, etc. Nice people.
VegasLegal@aol.com wrote:
>Dear List:
>
>Going over coucours judging criteria for the Tiger at past events, and
>comparing the same to other historic car events, I would like to pose a
>suggestion. It appears that the absence of a brake booster, the appearance of
>a non-original master cylinder, three point belts, etc., are modifications
>that could well count against your vehicle in judging.
>
>Other clubs and marques allow for certain safety upgrades that do not affect
>the judging of a vehicle, its desirability, or worth. For example, hydraulic
>upgrades of mechanical brakes never downgrade the car (presumably this would
>include a dual system), seat belts are always acceptable, and if the vehicle
>is a teenager without safety glass, it might even be disqualified if the
>original glass is still present (i.e., some upgrading is absolutely required).
>
>
>I believe I have worked out a system where I can install a dual master
>cylinder, keep the booster working for the discs (but not the drums), and
>maintain relatively original appearance save for the master cylinder.
>Considering the fact that I lost a one-off Mustang built by Ford in the past
>due to the failure of a single chamber master cylinder (and my brother was
>injured in the accident), I can attest that there are truly safety concerns
>and benefits addressed by such an upgrade. I don't believe that such
>modifications should result in a penalty, and pose the issue for discussion.
>
>For my .02 cents, the following should be allowed without penalty or
>discouragement:
>
> 1. Two or three point seat belts without requiring Rootes originals.
> 2. A dual master cylinder upgrade.
> 3. A fuel pump with automatic shut off.
> 4. An bolt on high mounted brake light at the top/front-center of the
>boot lid.
> 5. Further isolation of circuits at the fuse box. Heck, I can't even
>find fuses with amperage high enough for the Tiger, and there are ways to wire
>in more isolation with the original box.
>
> I realize that this might be the beginning of a slippery slope, and I
>wouldn't presume to make the whiner's cry of ... "even if just one life can be
>saved." Still, there is no reason for us to take our lives into our hands
>just to partake of a hobby.
>
> The only other add on I would like to have, but even I admit that this is
>probably over the edge, is a fuel cell. I cannot configure a way to preserve
>originality of the basic boot configuration without removing the big metal and
>rubber tubing from inside the rear bumper. (There may be a way to do little
>damage to the appearance through using the spare tire well, however). Still,
>just to add spice to whatever thread comes of this, whose bright idea was it
>to put a 2 1/2" fuel pipe in a bumper. Or, whose bright idea was it to
>effectively place the fuel tanks in direct contact with the outside body at
>the oft-impacted quarter-panels.
>
>Bob (I drive slow or on deserted roads) Nersesian
>
>
>Thea Marie Sankiewicz
>Nersesian & Sankiewicz
>528 South Eighth Street
>Las Vegas, Nevada 89118
>Telephone: 702-385-5454
>Facsimile: 702-385-7667
>
>
>
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