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Old 06-18-2007, 01:38 AM
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triangulated 4 link

hey guys new here and have a couple of quick questions.im putting in a trigulated 4 link from air ride pro in my 57 chevy, and just want to make sure i get it set right.i was wondering if the upper bars can be on a downward angle compared to the bottom,i was told that these bars should run almost the same at ride height,but there is no way that it could,and its looking like i might even have to cut a inch or so off the top ones.i was told by air ride pro not to cut any off and to run these full length but i just dont see how it can be done.my rear is a ford 9,and norrowed.if anyone could give me a little guidence i would appreciate,and pics of some installed would also be great thanks.

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Old 06-18-2007, 06:12 AM
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Quote:
Originally Posted by drywall guy
i was wondering if the upper bars can be on a downward angle compared to the bottom....
Certainly! This is, of course, as viewed from the side.

If the top and bottom links are parallel (again, as viewed from the side), the determination of the location of the instant center must be based on the principle that parallel lines meet at infinity. So, to achieve no squat or rise on launch, it would be necessary that all the bars be angled up, from the rear, at an angle with a tangent equal to the center of gravity height divided by the wheelbase. But, of course, I would guess that your lower bars are very nearly horizontal, which would mean that, if your upper bars are parallel to the lower, you'd experience a great deal of squat on launch.

So, in short, it's almost necessary that your upper bars be angled down.

As for length, it's always preferred to keep the bars as long as possible, for this reduces changes in instant center location with changes in fuel load. If all you're going to chop off is an inch or so, however, I wouldn't consider this drastic.

You might want to do some reading at my blog, particularly Page 11:

http://home.earthlink.net/~whshope
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Old 06-18-2007, 01:59 PM
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triangulated 4 link

wow thats some technical stuff! i should stick to drywall!thanks for the info,it is helping me see the light,my friends over at air ride pro are no help,except when i was buying it.
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