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Author Topic:   2 link,spring on top on rr
chapa73
Dirt Maniac

Total posts: 169
posted August 16, 2004 12:21 PM  
Im very sure this has been covered,but what are any advantages of running spring on top of housing on RR?

Also correct me if Im wrong,but having the slider infront of housing on lr will generally tighten car on exit.

Any other advantages. Thanks

mod70
unregistered Total posts: 169
posted August 16, 2004 01:50 PM           send a private message to chapa73   Edit/Delete Message   Reply w/QuoteBBBBBB
Runnig a spring on top of the rear end takes away any effect that rear end rotation would have on it. I beleive you are right about the LR in front tighting up the car because of the same reason, rear end rotates forward under power which applies pressure to the spring.

Kromulous
Dirt Forum Champ
Total posts: 796
posted August 16, 2004 03:26 PM  
If the LR is clamped to the axle housing it will, if on the birdcage (allowed to rotate) it may or may not.

The spring on housing is kind of mystery to me, no one really has said for sure what it does or its effects or at least not that i have read. Would love to know thou.

I-B-RACIN
Dirt Maniac

Total posts: 132
posted August 16, 2004 03:34 PM  
so if putting the spring in front helps load it why are they usualy floated on the back side of a birdcage on a four link?

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted August 16, 2004 03:56 PM  
Because on a 4 link as the car gets on the bars the birdcage indexes or rotates counterclockwise when viewed from outside. This loads the spring as the car hikes up for more bite. Clamped to the axle in front and on the birdcage behind are in effect trying to do the same thing just in different ways.

On the right rear the birdcage still indexes counterclockwise so the spring is placed on the front of the BC to put more pressure on the spring as the car rolls over.

I-B-RACIN
Dirt Maniac

Total posts: 132
posted August 16, 2004 05:43 PM  
thank for the info dirtbuster that clears things upfor me THANKS

cd2
Dirt Maniac

Total posts: 161
posted August 16, 2004 08:21 PM  
chapa73, from what i have been told & from what i have tried the spring on top of R.R.only gives spring rate to the wheel.On the two link if you have solid mounts & the R.R. behind as you go in & lift off the gas the rear rolls down & pushes up some on the spring & the car pushes down & this helps to tighten the car on entry.With the L.R. in front when you get on the gas & the rear rolls up it will lift on the spring as the car pushes down & this helps load the spring quicker& helps with bite off the corner.The 4- bar cars work the springs a little better & have a lot more mechanical lift from the bar angles.A good leaf spring setup with the proper arch will bite very hard even on the dry& this is from L.R. mechanical lift. cd2

dirtywrench13
Dirt Freak

Total posts: 324
posted August 17, 2004 03:21 PM  
THE LAWS ARE SIMPLE, IF THE SPRING IS CLAMPED SOLID TO THE AXLE, IN FRONT, IT WILL LOAD THE TIRE WHILE UNDER THROTTLE,AND UNLOAD IT WHEN OFF THE THROTTLE. IF ITS MOUNTED TO A BIRD CAGE IT SIMPLY INCREASES THE AFFCETIVE SPRING RATE IF MOUNTED BEHIND, AND DECREASE IT IF MOUNTED IN THE FRONT OF THE AXLE. THATS WHY A SWING ARM CAR NEEDS MORE SPRING THAN A CAR WITH BOTH MOUNTED ON TOP OF THE AXLE.

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