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Author Topic:   Multi Leaf Cars
3mracing
Member
posted August 21, 2001 06:03 AM
I have a Shaw multi leaf car and the guy who helped me set it up said to use equal weight/strength springs on both sides. The problem is the car has no forward bite. Other guys with the same car won't tell me what their doing, but their cars have awesome forward bite. Any suggestions?


irace74
Member
posted August 21, 2001 02:13 PM
Go to the AFCO web site and get info on spring set-up. If I remember corectly, the slope on the leafs is based on the front being 8-9" below the rear eye of the spring when loaded. Remember to keep 7 degrees of pinion angle +or- a little. Additionally, we run a little higher roll center on our leaf set-up. It is very typical for us to use a 7"-71/2" frame height on the rear of the car. Remember that a shorter lowering block typically has more bite. Your car should have about 58% rear percentage don't be afraid of 180 # of left rear bite. The rear percentage is based on 20 gal of fuel no driver. Atypicall 2300# modified will work well with either 175 or 200 # leafs on bothe sides and remember to get 71/2" arch in the springs. THere is alot here but, Maybe it will get you closer.


Pigpen
Member
posted August 22, 2001 02:41 AM
I have found that after 7 or 8 races the leafsprings start to wear out and forward bite is the first to go...pig


wheels13
Member
posted August 23, 2001 04:30 PM
the springs lose arch and need to be rearched to regain the proper amount of function. it is wise to have two sets of springs and rotate them to keep a resonably good arched set in at all times.


flyin41
Member
posted September 29, 2001 11:24 PM
Has anyone ever tried putting more than 8in of arch in a multileaf? Where should the front eye be mounted in relationship to the rearend?


LAYNE_Trans
Member
posted September 30, 2001 10:17 AM
leaf springs take a beating on rough tracks and typically will flatten. You can re-arch them but each time you do, they weaken and lose their ability to maintain their shape.

Springs with more arch make for a longer main leaf, if your eye to eye distances remain the same. With the same amount of rear shock travel, as the spring flattens under load, you could in essence bottom out the leaf in that the rear shackle moves further with the longer leaf and reach the end of its travel.

The chrysler springs (those with a shorter front and longer rear from the rearend centerline are worse for longevity than the chevy camaro types, but they all flatten.

3x Racing
Member
posted October 03, 2001 06:46 PM
Sounds like your pinion angle is off. Multi leaf cars need the pinion angle set a certain way. You have to pre-load the springs with the u-bolts to help keep them from wrapping up. We had a Pro car and when our pre-load or pinion angles were off, so was our forward bite.


xRaCeR
Member
posted October 04, 2001 08:50 PM
preload the springs with the u-bolts?????? enlighten us


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