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Old 02-14-2006, 06:40 AM
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Triangulated 4 link anti-squat

I have read several of the previous post about four link rear suspensions and have become very concerned about the designs out there, such as TCI, that show parallel links with reference to each other and to the ground that should have no anti-squat. There must be hundreds out there with this setup. I am referring to the chassis for the '32 Ford in particular. Just how important is this to a street rod chassis to have anti-squat. Without anti-squat, is the chassis going to transfer so much weight when accelerating from a dead stop that it will create tire rub on the rear fenders? Some of the builders are setting up the links where the instant center is behind the axle. How is the anti-squat figured in this setup? These should squat even worse than the parallel setups. Right? I am totally confused and need help to understand this suspension design.

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Old 02-14-2006, 07:14 AM
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First, weight transfer is determined by total weight, CG height, wheelbase, and acceleration. Nothing more. The only thing left to "adjust" is just how much of that weight transfer is carried through the links and how much through the rear suspension springs. With 100% anti-squat, it's carried entirely through the links and the springs see none of it.

Having each link pair parallel is great, in that there is no binding during cornering, but, as you pointed out, you get excessive squat if the pair is also parallel to the ground. If, however, the links are parallel to the no squat/no rise line (100% anti-squat), you still avoid the binding and, at the same time, have no squat or rise. This requires an angle with a tangent equal to the CG height divided by the wheelbase.

I would say that 100% anti-squat is particularly important for a competition car, in that a rear end bobbing up and down means rear tire loads are also varying with time. For a street car, parallel links that are also parallel to the no squat/no rise line will result in some loss in ride quality. Placing the IC on the line at a height equal to the tire radius will restore ride quality, but, unless it's a triangulated 4link OR a 3link, binding is a problem.

The no squat/no rise line passes through the rear tire patch, with the effects reversed as the IC is positioned behind the rear axle.

I discuss these matters more fully at:

http://home.earthlink.net/~whshope
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Old 02-14-2006, 02:15 PM
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Thanks for the reply. Sounds like the street rod chassis builder is looking for a combination of IC / roll center and spring rate to get the good ride characteristics. The triangulated four link seems to be the nicer looking package, but is susceptable to binding. The suspension travel on the street rod is very limited though. Lots of trade offs here. Thanks again.
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