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Author Topic:   Shorty panhard bar behind housing
doghouse racing4
Dirt Forum Racer

Total posts: 91
posted January 30, 2005 11:51 AM  
Imca says your panhard bar must be atleast 19". Has anybody tried a short panhard bar mounted behind the rear housing. My panhard bar behind is 26". I was wondering if making a plug and shortening the bar to around 19" would work? Also would this plug idea be strong enough to handle a panhard bar. Is there more stress placed on a panhard then a trailing arm using a plug? Also what different effect would this have to the handling compared to using a shorty bar in front of housing. My shorty bar right now measures 13" mounted in front.

mod52
Dirt Full Roller

Total posts: 30
posted January 30, 2005 08:49 PM  
I'm not sure if your placing the plug on frame or the rearend? I've ran 17", with a 3 hole bracket welded to pumpkin, for 2 yrs. Had to run it flat to tone it down. Seemed to come on all at once. I feel the reason for this is because the rearend side of panhard moves forward as the rearend gets up on my lr 4bar, further shortening the effective length of bar. In my situation, a 19" bar would be a step in the right direction. We'll see!! As far as the plug idea goes, if you plug the frame side the bar would be shorter but would really lock down the RR. If you plug the axle mount,I feel this would put additional leverage on mount that would twist it. I tried something similar to this when 1st trying short bar @ rear and ended up fabing a mount to weld to housing. If you do this, make sure braces welded over a spread area so it won't peel out the can of pumpkin!!
J-bars are successful, it might be easier.

de94wcc
Dirt Forum Racer

Total posts: 87
posted January 30, 2005 08:58 PM  

 
Here is a picture of what we have used in the past. Agree with mod52, the j-bar may be a better option. We fought a lot with this setup and it was not as consistent as the pinion mount. It seemed very sensitive to height and angle adjustments.

dluna
Dirt Freak

Total posts: 334
posted January 31, 2005 07:39 AM  
As mod52 said, if you plug the frame side, you are going to move the roll center more to the right. On the front of the housing your short bar's roll center is closer to the LR tire than with a J-Bar. So if you had problems with a J-Bar, you wouldn't want to plug the frame side on the rear. As far as mounting the panhard behind instead of the front, it is suppose to free up entry; however, I'm not sold on it making that big of a difference on a dirt modified. When you get off the gas, the rearend un-wraps back down closer to it's static position, which in turn will make the pinion mount on the rear move upward, thus raising the roll center a tad. Exact opposite goes for the panhard mounted on the front side, the pinion mount drops when you get off the gas.

Good Luck.

340duster
Dirt Maniac

Total posts: 195
posted February 01, 2005 10:28 AM  
de94wcc - Looking at your picture, I notice that your third link is adjustable right to left. Do you adjust it often? How much does it take to feel the difference? Does it effect entry and corner exit? How does it effect entry and exit? I understand the theory behind it, but need some practical (or experienced) advice as we are just building a new car and have made the third link adjustable like yours. Thanks for the help

coolexx
Dirt Roller

Total posts: 10
posted February 01, 2005 03:58 PM  
hey doghouse, which panhard bar did you run in fernley?

de94wcc
Dirt Forum Racer

Total posts: 87
posted February 01, 2005 06:31 PM  
340duster - We rarely if ever adjust the left to right on the 3rd link. I'm sure you can find plenty of posts on what the left to right does for entry and exit, but we more or less keep it centered on the rear end and in-line with the car. We have always focused more on the length and angle of the bar. Seems like every year we are finding a way to move the chassis mount forward and down. The car I'm building for this year will see the pull bar mount about 6" from the end of the transmission with just enough height to clear the driveshaft. My driver really seems to like this setup. I personally feel like you would have to have A LOT of left to right adjustment before you would notice a major difference to either wheel.

340duster
Dirt Maniac

Total posts: 195
posted February 02, 2005 09:10 AM  
Thanks for the reply. So you are lengthening the third link or moving the whole thing forward.

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted February 02, 2005 09:50 AM  
I ran a shorty panhard bar mounted in front of housing at Fernley. It is about 13". I also can mount it behind and it is 26" but I didn't run the long bar at Fernley, only the short bar. I was wondering what effect it would have on the car if I shortened the long bar with a plug on the housing mount. I don't want to move the mounts because there are tracks that I do run the long bar behind. Just was wondering if anybody had tried this before and what result it had. From some of these posts, it sounds like I will not do it.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 02, 2005 10:32 AM  
why not leave the mounts where they are and make another rearend mount either permanent or bolt on for the short bar. Then you can run either one and not mess with changing the mounts you have.

How about making a clamp bracket on either side of the center housing bolted to the axle tube. Then run a tube or bar between the 2 clamps behind the center then you could drill and bolt or make a sliding bracket or whatever to change the mounting point on the rearend along this bar without doing a lot of cutting and welding all the time, plus it would keep it off the housing cover.

[This message has been edited by dirtbuster (edited February 02, 2005).]

de94wcc
Dirt Forum Racer

Total posts: 87
posted February 02, 2005 05:14 PM  
340-we run the afco spring bar and we are lengthening it by adding a longer swedge tube. The mount on the rear end is left alone.

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