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Author Topic:   Z- link
Fastride 38
Dirt Maniac

Total posts: 137
posted November 29, 2005 10:45 AM  
I was having a chassis talk with a friend who is considering building a Z-link panhard bar mounted behind the rear in the center of the housing. First I couldn't even think of why. Then the more he explained rear movement and side bite it started making sense. Has any other chassis builder tried this and do yall think it will work?

Kromulous
Dirt Forum Champ
Total posts: 818
posted November 29, 2005 10:59 AM  
You wanna run like a jacobs ladder type deal, like whats on a sprint car?

One advantage is that the rear end wont move side to side very much. Which should add some consistency to a car.

One problem is the rear end indexing via the pull bar, but that could help play into your hand if you control the indexing amount, and calculate that into your initial setting.

Similar to a rear mounted short panhard bar, small angle so the car is loose in, and as you get on the gas it adds angle and tightens the car up.

wfoondirt
Dirt Forum Champ
Total posts: 513
posted November 29, 2005 11:35 AM  
A true watts link (most call it a z-link on dirt cars) is different than a jacobs ladder. Done properly there is no lateral movement of the rearend in ride or roll and also will contribute no jacking forces to the suspension. This is all good if you want to create a stable consistant and predictable car. If you want the car all jacked up and the rear end flopping around then its not the ticket for you. The downside is packaging/unsprung weight. A long level panhard bar will give very little lateral movement and is alot easier to package in a chassis. I played with a watts link a little a few years ago and the packaging issues weren't worth the small gains over a long panhard bar to me.

From a suspension analysis point of view you are better off mounting the pivot bearing to the chassis and the bars to the rear end housing. This minimizes r/c changes with suspension movement. From a packaging statepoint the opposite is usually true. Many trans am type cars run watts links but just as many run long panhard bars instead.

Here is a pic of a watts link setup.

and for reference a Jacobs Ladder

[This message has been edited by wfoondirt (edited November 29, 2005).]

Fastride 38
Dirt Maniac

Total posts: 137
posted November 29, 2005 03:16 PM  
Now that I see a picture of it. The 04-05 model jeep cherokee's have that same suspension. Intresting nether the less. Thanks wfoondirt for the picture. Seems to me going by Kromulous's post that if you had a tight in loose off problem this may be something to look into.

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