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TR4/4A TR4A Torque Reaction Arm

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K

karls59tr

Yoda
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Mine dosn't have one.Did all TR4's and 4A's come with them? Are they necessary? What occurs when driving without one? Why didn't TR3's have them?
 
Karl,

I seem to remember this question coming up once before. I don't think TR4A's had them at least neither of my 1966 TR4A's had them and I don't see it listed in the SPC for the TR4A.

Scott
 
It'd be a worthwhile addition for a car that is driven hard. Don't know where one could be had for a TR4A. I've noticed that if I am at speed (70ish) and quickly accelerate or lift off the accelerator I'll get a very slight wiggle. Of course it could be the entire 45-year-old frame and body flexing.
 
I think Joe Alexander sells them if you need one.
 
If you are racing or driving hard on the street, they take the twisting load off of the motor and trans mounts. Might make for more vibrations to the body though. I made them for all of race and auto-x cars, but for the normally driven street car, not really necessary IMO.
 
The engine restrictor bracket (torque reaction arm) was introduced on the TR4 in March 1962 starting with CT3055 and was to be retrofitted by the dealers to earlier cars. It was designed to prevent damage to the underside of the power bulge by carburetors contacting the hood under engine reaction movement. Triumph was obviously aware of the problem and stated that it was to be used until increased hood clearance was introduced as a permanent solution. This solution happened at CT6430 with the long-bubble hood. So in theory, only the short-bubble hood TR4s should have this arm.

gary
 
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