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TR2/3/3A TR3 coil spring height

jdavis

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So, I'm building up the suspension on my '59 project. I'm at the point of putting in the coil springs. The coil spring is 10.25" and the aluminum packing adds 1.25" It seemed really tight going in, and the spring seems a bit bowed after installed. I did some reading, and now I understand that that there are two different Springs available. Apparently I have the "tall" ones. I also understand that there may be two different size packings. My question is, Do I just omit the packing all together? I can't seem to find a source for the shorter packing. I have some shorter springs, but they look pretty tired.
Thanks
Joe
 

CJD

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Bowed like this? This is normal. If you think about it, the top of the spring is always level, and the bottom has to be tilted to the angle of the A-arm, so with no weight on the car the spring will always be bowed. It should be almost straight once the weight is on the car and the arm is also level.

I really don't know anything about different length springs in the TR3's, but I know from suspensions in general that if you have a longer and a shorter spring which are both designed for the same application, the shorter spring will have a higher spring rate. I.e. stiffer ride. The longer spring, likewise, will have a softer ride and must be compressed more to hold the car at the same height...thus the longer length.

I would not leave the spacers out unless you are using a known modified spring and you are sure it requires them to be removed.
 
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jdavis

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Thanks John, for the reply I've done some research. It sounds like the stock TR3 spring is 9 3/4" tall and used with a 1 1/4 inch spacer (total height 11") The "tall" spring advertised by Moss, etc... is 11" I have 10 1/4 springs. The only reference I can find is at Englishparts.com. They describe a 10 1/4 312 lb. spring for TR4a-TR6 They imply that this spring can be used for TR2-TR4 as well, but don't specify with or without the 1 1/4" aluminum spacer. I assume that if I use this 10 1/4 spring I should NOT use the spacer? Any suggestions?
Joe
 
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jdavis

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I had a revelation. When I restored my TR6 I put Good parts lowered springs all around the car. I was worried that the ride height might be too low, so I bought 1/2" spacers. I found the spacers in the spares bin. This, with the 10 1/4 coils brings the total height to 10 3/4"!
Joe
 

CJD

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It's really pretty complicated when you're dealing with suspension dynamics. It's not just the free length, but also the rate of the spring. If they are both from Moss, you may want to talk to their tech guys to see what they know about the springs. They should have an idea of what each one will do for ride height and stiffness, both with and without spacers.
 
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