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Author Topic:   4-link
Alltel
Dirt Maniac

Total posts: 180
posted June 25, 2004 03:29 PM  
I've read and read on 4-link rears and everthing I read is different. I like the dirtworks with the 15.5 and 12.5 bars. I'm going to try and convert a car from a 3-link to a 4-link for next year. I'm having to re-clip the car anyways and it seems like I get beat by more and more 4-links each week. My question is what are the best lenths, angles, birdcages, springs, spring locations ect? Any info at all would be appreciated. I'm building all this on my own, so I don't really have any reference points to go off of.

mod4
Dirt Freak

Total posts: 223
posted June 25, 2004 04:23 PM  
I just went through what you are talking about. My 1997 D&M 6 Link, while a great car, was getting killed in forward bite by two different 2004 4 link chassis at my track.

I just took it to the best late model driver I knew about and let him have at it, and after a couple weeks getting used to it and figuring out what the car wants, won my first feature of the year last race.

I love to do things my own way, I never before have followed the trends, but in this case when I couldn't beat 'em, I just got the same stuff as them, lol.

NJantz
Dirt Forum Champ
Total posts: 755
posted June 26, 2004 03:34 PM  
As far as lengths go, make the bottom bars links around 12-15" and the top around
15-17".

Set your bottom brackets up so you can get about -5deg. to 15 of lower bar angle.

Set the top brackets up so you can get about 10-25 deg.

The choice is yours on where you mount the springs. It just depends on what you want the car to do and on what type of surface.
I'd put multiple mounts on it since you are reclipping the car. Definitely want a mount for the spring behind the axle on the LR birdcage. Put mounts also for both swingarms. Then you might put mounts if you were to run the axle clamed up.

NJantz
Dirt Forum Champ
Total posts: 755
posted June 26, 2004 03:36 PM  
also put you some mounts on there so you can zlink the car.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted June 26, 2004 08:26 PM  
i run a 14.5 upper right now and a 21 lower.
hhhmmm... i know its different.this is on the left rear

most cars run the lower 2-3 inches shorter than the top.

Alltel
Dirt Maniac

Total posts: 180
posted June 27, 2004 09:44 PM  
OK, some new questions. I put the rear clip in today and I can't see how to get the top bar in. I can run a 16" bar in the bottom, but the seat slants backwards and I could only get a 10" bar on the top. How do you guys fit these bars in there? Also, do the brakes have to be floated, or can they be mounted to the housing? I'm trying to retrofit an old hoover chassis.

fastow
Dirt Maniac

Total posts: 168
posted June 27, 2004 10:34 PM  
Zero xplain yourself on your last post whats your idea on the shorter upper links and what side did you mean?

NJantz
Dirt Forum Champ
Total posts: 755
posted June 28, 2004 05:57 AM  
Alltel- In order to get the longer top bars in, you will have to increase the wheel base and move the whole rearend rearward with longer lower bars, or relocate your seat. I chose to relocate my seat. Basically I took all the angle out of my seat and it got me 4 more inches. My top bar on the left rear actually comes into the cockpit. Also had to move the rear wall of the cockpit forward.

The brakes don't have to be floated, but it is another added feature you can tune the car with. My RR is floated.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted June 28, 2004 11:22 AM  
i run that on the left side only. and swing arm rr for now.
my bars are short upper and long lower. this is for a few reasons.
1)increase indexing for spring behind.
2)cuts down on rearsteer, so the car wont walk tward the wall on exit.
3)reacts slower, car seems slightly more drivable.

on my right side i have like 15 upper and 12 lower when i run 4 link. dont run it often.

Alltel
Dirt Maniac

Total posts: 180
posted June 29, 2004 06:37 PM  
Any info on birdcages? I think I'm getting close to actually figuring this thing out. I had to move some brackets so the trailing arms will run up next to the seat, like they did with the 37" long 3-link bars. I'm now at the stage of trying to pick out birdcages.

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