Triumph Sports Cars

engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8)

Go to Thread: PreviousNext
Go to: Forum ListMessage ListNew TopicLog In


tr6nut
Gene Holtzclaw

(2 posts)

Registered:
06/06/2010 10:34PM

Main British Car:


V8 TR6
Posted by: tr6nut
Date: February 28, 2016 06:21PM

Hey guys, been a long time since I've been on here. I built a TR6 V8 putting a Chevrolet 302 to 68 Z28 specs. (old school) 25 years ago. I traded the car off shortly after I built it, but kept up with it all these years. Traded back for it about 5-6 months ago. My problem is I have broken the u-joints twice now. The differential is a Corvette unit that I put a 4.10:1 gear in. The car is a blast, but to throttle it from low speed, means something is going to break. First time, it killed the right rear trailing arm. Any suggestions appreciated. Btw, at the time, I purchased Spicer pto yokes that just happened to be master splined to the TR6 outer axle. The inner u-joint is same as a Corvette.


mgb260
Jim Nichols
Sequim,WA
(2049 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: V8 TR6
Posted by: mgb260
Date: February 28, 2016 09:32PM

My guess is, the low gear ratio(torque multiplication) with angularity of axles. At road height, axles should be angled down towards the wheels a bit (to counteract squat) and you should be in the middle of the slip yoke. Most U joints don't like more than 7 degrees before binding.


tr6nut
Gene Holtzclaw

(2 posts)

Registered:
06/06/2010 10:34PM

Main British Car:


Re: V8 TR6
Posted by: tr6nut
Date: February 29, 2016 09:40PM

Would you believe that came up in discussion today with a good friend. I feel that when I stand on it, the car squats hard, and is actually driving the outer male axle too far into the inner axle, and binding the u-joint. When I get my next axle and u-joint put back together, I'm going to remove the spring, and see if I am correct. Not sure what next, but am wondering if I could have extensions made to screw onto the trailing arm to move the rubber bump stop closer to the frame to limit travel? I have uprated springs on it, and the ride is kinda stiff now. Guess I will find out soon.


mgb260
Jim Nichols
Sequim,WA
(2049 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: V8 TR6
Posted by: mgb260
Date: March 01, 2016 09:38AM

On my 510 years ago, I used 800 lb springs because of the leverage/length of the trailing arms to limit suspension travel. Remove the shocks and springs and center the axles at midpoint of travel. With the HP and gearing you have you may have to go to VW type 2 (bus)CV axles. You can make adapter plates for the CV's and buy Empi axles and have Dutchman shorten and respline one end. I like them better than the Porsche CV's as they have 33 splines rather than 28.



Edited 1 time(s). Last edit at 03/01/2016 09:45AM by mgb260.


Sorry, only registered users may post in this forum.