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Old 04-18-2009, 02:04 PM   #1 (permalink)
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Location: Kansas
Posts: 63
4-Link calculations, second opinion

Before I get flamed on a Saturday afternoon and yes I know where the
search button is.!

Here is a little back ground on the rig, 1981 CJ7, with a 4.3 TBI, Th350, dana
300 w/4to1, Dana 60's front and rear locked w/ 4.56 gears, Front springs are
Rubicon Express 1.5HD SOA, front axle has been moved 2" forward. The fuel
cell will be an RCI 2161A located behind the seats. A tuffy box occupies the
rear seat area with a full size spare. I have read most of the threads about
4-link and have decided the most popular double triangulated is def. the way
to go. I went out to my jeep and made some baseline dimensions to install
into the calculator. I tried to keep my upper links to 70% of the lower link.
I wanted a little over 100% antisquat from my research that smaller HP
motors can benefit from the extra traction. RC Slope and RC Angle are both
slightly neg. but I'm unsure how big a roll this will play.

We wheel primarily in KS, MO. OK. the terrain is hilly, off camber, we often
run creeks and ravines loaded with large rocks and trees. Don't like mud and
never make it to anything like Moab.

Thanks for your input.

Four Link Calculator vers 1.5 html
Vehicle Specifications:
Wheelbase in CoGX 105 in
Tire Diameter in CoGY 38 in
TrackWidth in CoG Height 80 in
Total Weight lbs Front 1/2 Weight 2800 lbs

Suspension Geometry:
Upper Links X Y Z
Frame End 28 14 28 in
Axle End 1 3 26 in
Vector 27
11
2

Link Length 29.223in
Unit Vector 0.9239
0.3764
0.0684
1

Intercept -6.363
2.5925
25.925 in
Roll Point -6.363
0
25.454 in
Forces 4082.0
1663.0
302.37 lb
Vert Slope 0.4074 in / in
Hor Slope 0.0740 in / in
Lower Links X Y Z
Frame End 39 2 24 in
Axle End 4 22 17.5 in
Vector 35
-20
6.5

Link Length 40.831 in
Unit Vector 0.8571
-0.489
0.1591
0.9999

Intercept 42.5
24.285
16.757 in
Roll Point 42.5
0
24.65 in
Forces -5625.
3214.8
-1044.lb
Vert Slope -0.571 in / in
Hor Slope 0.1857 in / in

Design Summary:

Anti-Squat 104.93
% Roll Over Angles
RC Slope -0.016 in / in ("-" = roll understeer; "+" = roll oversteer)
44.99 degrees Left
RC Height 25.349in
46.43 degrees Right
RC Angle -0.943 degrees ("-" = roll understeer; "+" = roll oversteer)
41.90 degrees Forward
Instant Center X-Axis 82.127 in
60.87 degrees Rearward
Instant Center Y-Axis 0 in
Instant Center Z-Axis 32.009 in
Excel Version 1.5 Dan Barcroft & Greg Blanchette
Pirate4x4 Discussion

HTML Version by: Benjamin Porter

Yield strength of material in psi
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millertime

81 CJ7, 4.3Vortec, TH350, Dana 60's F & R, 38 TSL's

Life is good.........Beer and BBQ are better!
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Old 04-18-2009, 06:58 PM   #2 (permalink)
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Download the 3.0 version and repost. Make it a little easier on yourself and us. However, what you got goin looks fine.

Try not to focus so much on link length relations and focus more on the geometry summery. I think its great that youve obviously done a good deal of research, but it seems your making it a little more complicated than you need to.

Also make sure you have 3-4 even 5, upper link, frame end locations. That way you can fine tune what you desire. When you decide the locations, imput that info into the calculator and pay close attention to the summary.
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Old 04-19-2009, 10:27 AM   #3 (permalink)
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Join Date: Feb 2004
Member # 27243
Location: Kansas
Posts: 63
Thanks! I have a horrible tendoncy to over-think everything. Part of
the problem is I do too much research and try to apply EVERYTHING that
I have gathered. I'll try and post up from the .xls spreadsheat.
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Later,
millertime

81 CJ7, 4.3Vortec, TH350, Dana 60's F & R, 38 TSL's

Life is good.........Beer and BBQ are better!
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