Richard/SIA Richard Brengman No. Nevada (399 posts) Registered: 01/17/2014 07:47PM Main British Car: 1969 Triumph GT6+ 225" Buick V6 |
To let TR4A rear suspenion work, which spring leaf to pull?
With essentially no weight on the rear of the car the under-slung axle is against the frame at all times.
Jumping on it barely imparts movement. So unless I want to get into some extensive redesign I need to remove one leaf from the rear to compensate for the much lighter load. Short bottom leaf, or the one above? Adding a fuel tank and maybe a spare tire will not be enough with the light fiberglass body I am putting on. |
DiDueColpi Fred Key West coast - Canada (1365 posts) Registered: 05/14/2010 03:06AM Main British Car: I really thought that I'd be an action figure by now! |
Re: To let TR4A rear suspenion work, which spring leaf to pull?
Depends on what you want Richard. Pulling the shorter leaves first will give you a softer more compliant spring with very little progressive action. Pulling the longer leaves first will result in a spring that has a much stronger progressive action at the expense of "wrap up" under torque resulting in wheel hop under higher power applications. Having a custom spring built isn't very expensive and gets you exactly what you need. If you are going to use the original spring, I've had the most success by reversing or "flipping" leaves starting with the longest and continuing as needed. The vehicle gets lowered with a very solid progressive action and the springs integrity remains intact.
Cheers Fred |
Richard/SIA Richard Brengman No. Nevada (399 posts) Registered: 01/17/2014 07:47PM Main British Car: 1969 Triumph GT6+ 225" Buick V6 |
Re: To let TR4A rear suspenion work, which spring leaf to pull?
Well, it looks like I'm going to use my Alfa engine - OD five speed, and adapt the 4.56 LSD Alfa axle to keep the drive-train a matched package.
The Alfa drive-train is complete, the Buick would require me to buy another trans, flywheel, clutch, bell housing, shifter....... I will find something to put it in eventually. I will be modifying the rear of the frame to have a kick-up, Alfa trailing arms, upper link and coil springs. So all that will remain Triumph is most of the lower chassis rails, front suspension and steering. At the new expected weight I probably need to find softer front springs now. Expecting some adjustments once on the road. |