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Author Topic:   CANTILEVER SUSPENSION
99EMBREY
Member
posted December 05, 2001 04:19 PM
If you're talking about te frontsuspension, it's cantilever shocks. The shocks mount inside the frame leaning out at the bottom. The attac to a brcket connected to the lower control arms. It appears to protect the socks and make mountng easier.
dman


dman60
Member
posted December 06, 2001 10:23 PM
SORRY ABOUT SO MANY LETTERS MISSING. I REALLY THOUGHT I WAS TYPING BETTER THAN THAT. ANYWAY, EMAIL ME IF YOU NEED A TRANSLATION.LOL


smayo964
Member
posted December 07, 2001 07:31 AM
I have an older '94 DW4 that was orginally a cantilever suspension. My car has been up graded to a (3) link, but I still have the original parts. If I'm correct in review of the pieces, etc., the original suspension was either a leaf or 3-link type setup with a third member typical to a pull bar. The member is V-shaped and about 36-40" long. This member connects to the "upper" level of bars on the roll cage somewhere above the tail stock of the trans, and connects right of center on the differential. There is a 3rd coil spring mounted on an eliminator that is adjustable along the length of the third member and chassis, being able to put more/less down force on the rearend by moving the spring forward or backward in the chassis. I'm not sure of all the principles, but I hope this gives you an idea.


cleatus
Member
posted December 07, 2001 08:34 AM
I had a Bullitt Late Model in the '80s with the cantileverd rear end. The bottom link going forward is like a two or three link, but hooked to a birdcage on the bottom. We had a coil-over from the top of the birdcage going back to the frame. It hooked up really well on a wet track but we could never get it to work on a dry/slick.


22Power
Member
posted December 10, 2001 06:01 PM
the catilever actually connects from the UPPER a-arm rather than the lower as stated earlier. there are two shock mounts on the main fram that the top of the body of the shock mounts to, and then the shaft of the shock mounts on an arm that extends off the top a-arm. go look at a larson car, if cantilever was so much better, everyone would have it. thats my opinion.

22Power

wfoondirt
Member
posted December 11, 2001 09:22 AM
Typically a cantilever suspenson is as bkap described. Larson and a few others run a cantilever shock setup, which is not a true full cantilever setup.

A cantilever suspenson is most common on indy/f1 type cars. The sping/shock combination is not connected directly to the trailing arms but is connected through a pivot point and a solid link. This is most often done because of packaging issues not from a big performance advantage, although it offers alot of different variables in adjustability ie motion ratios/rates etc.
I've contemplated the feasability of using it on a modified but without being allowed to use coilover shocks it would get messy pretty quick. Like bkap said some l/m builders experimented with it in the 80's but i don't think enough r&d was done for it to become popular.


racinrich66
Member
posted December 11, 2001 02:57 PM
I have seen a cantilever rear suspension on a dirtworks car a few years back. It looked as if the eliminators where mounted in a z-link position with the bottoim bars going to the front. In my oppinion a simple two link was faster that paticular night.

wfoondirt is correct about the champ cars being the only cars to use a true cantilever suspension incoperating pilliar blocks and solid links to mount the coilover assemblies to the a-arms.

As for the front cantilever idea, like the one on the Wayne Larson cars, I think thats done only to protect the shocks during a wreck.I could be wrong.

spde
Member
posted December 11, 2001 08:57 PM
dw's rear cantilever suspension has the coil eliminators mounted directly on the trailing arms. These arms are a short arm with an angle bent into them. The coil eliminators are mounted on an angle into the middle of the of chassis. The spring package for this setup is a little heavier because the cantilever has more of a mechanical advantage over traditional rearend setups. I race against a couple guys running this setup and they do pretty good. I also run against guys running this setup as a "z" link with the links locked. I dont know really how good this set up works but I do know it wins! Alot of this is from the driver being so smooth and not making any mistakes. My buddy is going to run this setup next year so i know a little more about it later. good luck ltr


Braided Dirt
Member
posted December 13, 2001 10:55 PM
I ran a cantalever on a late model last year and got it working really great for dry slick, but the motor wasn't running right, so we never did get to see what it would do. To my understanding there are two ways to run a cantalever,
1. the short arm (toward the front) has the mounting point for the shock. and there is a much longer arm toward the rear.
2. the short arm and rear arm have no shock on it and the shock is mounted directly to the birdcage that the arms are on.

As for a basic definition of a cantalever to my knowledge is that the front arms are shorter than the rear arms.
Rayburn doesn't make a straight cantalever chassis anymore, I believe that they still have the option of having one side cantalever, they just don't drill the holes for the otherside to be a cantalever.
This set up might be coming back into fashion, I know of at least one upperlevel latemodel driver who has requested a cantalever chassis.

I may be totally off on what I said, but this is only my 2 year in this sport.

BILLY BOB
Member
posted December 14, 2001 10:04 AM
The canteliver you guys are talking about is called a z-link. When the springs are on the lower link it is sometimes called a swingarm-z-link. Back a year or so ago Dirt works had a picture of Andy Claiborne's car on their site where you could see the rear springs as the car was lifting. It was a true canteliver.
A canteliver is where the springs and sometimes shocks are not bolted directly to the rearend and are most of the time mounted horizontally or slightly angled beside the fuel cell. A straight rod connects the spring on one end and a pivot on the other. the pivot has the spring bolted to the other end of it and as the rearend moves the pivot rod rotates thus compressing the spring. A good example of this kind of suspension is on the DIRT type modifieds that run up around New York. I think some of them still use it. I think the IMCA book says no catelivers though so DW got away from it.