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Author Topic:   another good ol four bar question
dirtracr
Dirt Forum Racer

Total posts: 79
posted October 22, 2001 08:43 PM
on the four bar cars with the left rear behind the axle..exactly what are guys doing to get that left to crawl up under the car like that..i could see if it was clamped but they are running lr behind and they also look as though they roll over a ton in the corners,,see some of the car pix on dirt works website, especially johnny bone, jr....is it in birdcage indexing, bar lengths, angles, springs, scaling, what???would appreciate some in depth comments on this...my car seemed to crawl up under more when i tried the short straight panhard bar but we never could get the s.o.b. to hook up off the corner with or without rake in it. so we went back to the j bar...thanx in advance...the tracks we normally run are dry slick...

wfoondirt
Dirt Freak

Total posts: 242
posted October 23, 2001 08:18 AM
The reason for the excessive lift on the left rear is from the bar angles, most notably the top bar. The reason the lr moves so far forward is from using very short length bars. The lr spring is typically mounted on the back of the birdcage so the spring will compress as the b/c indexes.

dirtracr
Dirt Forum Racer

Total posts: 79
posted October 23, 2001 04:15 PM
aahhh..our car is a dirt works dw7, the 8's have the shorter bars..my car does have a certain amount of lift but not like some of my buddies, and being competitors, i cant get s*** out of ém...my top lr link is usually in the second hole from the top...i have a buddy that runs excellent with the 8 and actually has his top rod in the hole BELOW what we would call neutral or what dirt works recommends as a starting point....with my situation, would shortening the top rod help? any other pointers would be greatly appreciated...thanx..

[This message has been edited by dirtracr (edited October 23, 2001).]

wfoondirt
Dirt Freak

Total posts: 242
posted October 24, 2001 08:32 AM
If you want to shorten the bars you need to keep them both close to the same proportions that they are now. Changing the length of just one bar will change how the b/c indexes and also has a significant effect on i/c movement. A 1/4" change in the length of one bar can make a dramatic difference in handling on a 4-bar.

Fast62
Dirt Newbie

Total posts: 1
posted October 24, 2001 12:03 PM
So what are most of todays modifieds that are running 4bar left rears typically running for bar length. How about the lenghts of the right side if you are running a zlink. Are they running both bars the same lenth or the front bar shorter. Thanks

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