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Author Topic:   swing arm suspension
Dirt Full Roller

Total posts: 40
posted March 28, 2002 09:40 PM
My car uses swing arms. There are holes at different places in the arm for the slider to bolt to. If frame (top) mounting position of the slider is constant then would moving the swing arm (bottom) of the slider away from the axle change the apparent spring rate at the axle. It would seem to me that the resistance of the spring to the axle would be less the farther the spring is mounted to the swing as it acts as a lever that is acted on by the axle.Is this a feasible way to adjust the spring rates without having the expense of additional springs? If so is there any negative affect on the way the rear suspension works by doing this? Also, The swing arms are mounted to a solid clamp(not a bearing floating on the axle). Is this a true swing arm suspension or is it simply a two link setup with the added benefit of being able to change the spring rates (if that is true). Sorry so long but I have a lot of questions.

Dirt Freak

Total posts: 242
posted March 29, 2002 09:27 AM
Moving the springs farther from the axle on the swing-arm lowers the wheel rate, there is a calculator in the toolbox that calculates the rate for a given distance and length of swing-arm.
The term swing-arm refers to the springs being mounted to the lower link of the suspension. As long as the springs are mounted this way it would be considered a swing-arm suspension. I beleive what you are asking about the links being connected to a birdcage would be a z-link swingarm, with the lower link running forward with the spring mounted to it and a top link running towards the rear of the car.

Dirt Full Roller

Total posts: 56
posted March 29, 2002 10:47 PM
Same as 2-link only harder to change springs or to raise or lower trailing arm position since you will have to read just the rear suspension, along with the added wear on your hiems. I perfer to be able to mount the springs in front, rear, or on top of rear end.

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