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Re: Lowering Links For Leaf Spring Suspension [Re: cheapstreetdustr] #541637
03/20/10 07:44 PM
03/20/10 07:44 PM
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr Offline
master
cheapstreetdustr  Offline
master

Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
this would show it with mounting holes along a radius...axis off the center line of the axle.

5877504-radiused.jpg (40 downloads)

365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
[image][/image]
Re: Lowering Links For Leaf Spring Suspension [Re: cheapstreetdustr] #541638
03/20/10 07:45 PM
03/20/10 07:45 PM
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr Offline
master
cheapstreetdustr  Offline
master

Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
this would represent the effect of the change
from putting the the spring in the top hole.
and the chassis moveing down..to accomidate for the new ride height.

5877506-lower.jpg (48 downloads)

365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
[image][/image]
Re: Lowering Links For Leaf Spring Suspension [Re: cheapstreetdustr] #541639
03/20/10 07:47 PM
03/20/10 07:47 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
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Joined: Jun 2003
Posts: 52,972
Romeo MI
double check that MrP..

the reason i say this..is ..
if you take that diagram and measure the distance from the center of the axle
to the lower hole
then to the middle hole
then the top hole..
you will find the top holes distance will be the longer/longest distance of the three positions.
unless you drill the three holes along a radius from the center axle..(not as shown...as shown its running in a straigh verticle line..)
so you would either have to move the Box/chassis down...
to reach the spring bolt
or
raise the center line of the axle ..again...so the spring bolt will reach the hole.
this will inevitably change the three points that factor to find I/C
the only point (of the three) that doesnt move is the bottom of the tire..as it is setting on the ground...
cheapst




I dont see how your changing the arch of the spring
to make it longer... all I see is that the body moves
up or down... I dont see it changing the front bolt
in relation to the diff, unless you add or subtract
weight to change the arch of the spring...... JMO


Re: Lowering Links For Leaf Spring Suspension [Re: MR_P_BODY] #541640
03/20/10 07:58 PM
03/20/10 07:58 PM
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr Offline
master
cheapstreetdustr  Offline
master

Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
Quote:

double check that MrP..

the reason i say this..is ..
if you take that diagram and measure the distance from the center of the axle
to the lower hole
then to the middle hole
then the top hole..
you will find the top holes distance will be the longer/longest distance of the three positions.
unless you drill the three holes along a radius from the center axle..(not as shown...as shown its running in a straigh verticle line..)
so you would either have to move the Box/chassis down...
to reach the spring bolt
or
raise the center line of the axle ..again...so the spring bolt will reach the hole.
this will inevitably change the three points that factor to find I/C
the only point (of the three) that doesnt move is the bottom of the tire..as it is setting on the ground...
cheapst




I dont see how your changing the arch of the spring
to make it longer... all I see is that the body moves
up or down... I dont see it changing the front bolt
in relation to the diff, unless you add or subtract
weight to change the arch of the spring...... JMO






ok...ill buy that..
unless the see/saw effect of the rear spring mount moves..with the new chassis angle..behind the axle moves..(up)..
its prolly miniscule ...looking at that.
ill have to chew on this more..
but your point is taken...
cheapst


365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
[image][/image]
Re: Lowering Links For Leaf Spring Suspension [Re: cheapstreetdustr] #541641
03/21/10 09:40 AM
03/21/10 09:40 AM
Joined: Mar 2005
Posts: 1,559
Michigan
K
Kiddart Offline
pro stock
Kiddart  Offline
pro stock
K

Joined: Mar 2005
Posts: 1,559
Michigan
Mancini Racing has them with two holes I think they are 70 bucks a pair in stock. Make sure you check Pinion angle when you move from hole to hole. You may need to add a very small 1 or 2 degree shim to get you where you want or take out depending what you are currently at. But them again I am not the smartest I am just recalling to what I have learned on here from Monte and Mr. P.

5878381-DSC05993.JPG (38 downloads)

Thank you
Kiddart
Re: Lowering Links For Leaf Spring Suspension [Re: Kiddart] #541642
03/21/10 12:14 PM
03/21/10 12:14 PM
Joined: Jan 2006
Posts: 419
NY
F
F1Scamp Offline
mopar
F1Scamp  Offline
mopar
F

Joined: Jan 2006
Posts: 419
NY
So.... I just want to make sure I am grasping this correctly.
The only way to effectively change the instant center on a leaf spring car is to change the height between the axle center and the front spring mount bolt? Correct?
So the flatter the front spring segment is, the "softer and longer" the car will "hit" the tire. The more arched the front spring segment, the "harder" it will "hit" the tire, more prone to wheelie's, etc.


Work In Progress- 71' Duster F.A.S.T.- 10.36@130 Smallblock Record Holder.
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