Hi Paul,
The other response is correct... it sounds like you already have a five-way
connector. One of the connections attaches to the *top* of the "funky silver
nut" thing. In fact, that is the connection for the pipe that goes to the
master
cylinder.
That silver thingy is a one-way pressure valve helps prevent returning brake
fluid from pulling the caliper pistons too far back into the calipers, which
would mean you'd need a longer pedal stroke to engage the brakes. My TR4 has
always had one on it and it works fine. I disassembled it and cleaned it
exactly
once in over 25 years owning the car. Some folks take them off and seem to
get by without. So, it's your choice.
The other four connections are at the base of the brass unit. One is a 1/8"
NPT thread (tapered), the other three are 3/8" NF thread with a conical seat
at the bottom (check them with a 3/8" NF bolt, gently, to decide which is
which... the bolt won't thread very far into the 1/8 NPT outlet). The 1/8" NPT
outlet is normally oriented toward the lefthand side of the car (toward the
exhaust manifold) and that's the one to which the brake light switch connects.
The front outlet serves the left front brake line. The righthand outlet
serves the short pipe to the right front caliper. The rear outlet serves the
single
line that leads back to the rear brakes, eventually to a flexible hose next
to the righthand rear shock, and a three-way connector that splits the line to
feed both right and left rear drum brakes.
Regarding installing dual exhaust... it can be done. I've seen it and it
sounds nice. A few major considerations: Too large pipes will reduce back
pressure
to almost nil and the car will have little low end torque, but will have more
top rpm power. That may be fine at Sebring, but might make it hard to drive
on the street.
If you decide to install dual exhaust, use a pair of smaller pipes (maybe
1-1/2" or 1-3/4" max) at least as far as the mufflers. Next, you should "mix"
the
exhaust from the two pipes, unless they are fed off a single collector header
or manifold. (TR4A originally have a dual outlet manifold and Falcon
stainless headers feed into dual 1-3/4" pipes, probably some other headers do,
too.)
If you have a dual arrangement at the header or manifold, it would need to
first be joined to mix and balance the exhaust. A single 2 or 2-1/4" pipe could
lead from this (or directly from a single pipe manifold) through the box at the
center of the frame cruciform, after which it could be split into the two
smaller pipes using a Y-pipe, leading to two smaller mufflers/tail pipes. One
issue might be the parking brake cable on the righthand side. It would need to
be
kept clear of the exhaust pipe.
Cheers
Alan Myers
San Jose, Calif.
However, the original one I removed from the car has only three
connections for brake lines (including the line from the master cylinder), the
brake light switch AND a funky octagonal silver 2" tall nut that must act as a
pressure relief valve.
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