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Author Topic:   another 4 bar ?
holeshot
Dirt Maniac

Total posts: 119
posted October 13, 2004 10:52 PM  
just changed my z-link on the left of my car to a 4 bar hoping to get better bite off the corner. my ? I did not have a lot of room so with the top bar all the way tight (short as i can make it) the top of the bird gage is about 1/2 to 3/4 behind the ceter line and I am afraid to to make the bottom bar longer because the drive shaft might be to far out of tranny and the top and bottom bar would be just about = in lenth. so could i weld a tab to the top of the bird cage so the bottom bolt would be centered and the top would be behind the ceter line by about an 1" or would that cause a bind . top bar 16" and the bottom is 15" right now

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted October 13, 2004 11:43 PM  
I would think in my opinion, I would build a plug to use a shorter lower link than the top link but make the plug long enough to even up the birdcage. That all depends of course on how short is your top bar? I don't see how your current situation would bind anything, what its going to do is index the birdcage more. Therefore it will get on the bars more. That what I think, I'd like to see what the rest of you guys think about this.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted October 13, 2004 11:48 PM  
One more thing.....about your driveshaft. If it is that close to pulling out of the tranny at ride height, then the first time you go into the turn its gonna jerk it out anyways. Might want to get a longer shaft or yoke and save yourself a headache. Because when the car drops off the bars going into the turn, the rear end is gonna move back further than it is at ride height and we all know that losing a driveshaft can be very dangerous. My recommendation is get a longer yoke if possible and then you can make your bars longer.

NJantz
Dirt Forum Champ
Total posts: 755
posted October 14, 2004 08:42 AM  
Switching to 4/z setup generally requires longer driveshaft yokes due to more rollsteer being generated. I'd recommend you invest in one.

You don't want your 4 bars equal in length. About 2" difference will produce the motion ratios you need.

I'd avise you against your birdcage idea.



holeshot
Dirt Maniac

Total posts: 119
posted October 14, 2004 09:48 AM  
thank guy's the yoke is already long it is 5 7/8 long but 3 1/4 sticks out of the tranny (brinn) with the wheel base at 108. as far as the plug goes I was afriad of making the lower bar to short and have to much movement. bottom bar is 15" center of rod end to center of rod end actual bar lenth is 12" but when I get home tonight I will take a look at doing the plug. do think the drive shaft is going to be a problem like that ? how much should I have sticking in and out? thanks again.

NJantz
Dirt Forum Champ
Total posts: 755
posted October 14, 2004 02:00 PM  
When I made my zlink into a 4/z I think I cut about 1.75" off the driveshaft and added the long slip yoke.

I'd keep about 2-2.5" of the slip yoke in the trans. And leave your self about .75" clearance for when the drive shaft slides all the way in.


andykmod
Dirt Freak

Total posts: 351
posted October 14, 2004 07:24 PM  
My upper link on my car is 15 1/2 inches center to center and my lower is 15 1/8 inches center to center.Worked good but had to make sure it would not over index on real tacky tracks,it works great on dry-slick

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