Thread: 4link

Tweet

Have lots of questions.
1) Purpose? (What do you want from the suspension?)
2) Like Jerry asked: Off the shelf or fabbed?
3) Do you have design experience with this type of suspension?

I don't think you have the experience or you wouldn't be asking this question...
I did a quick mark-up in Paint for you to illustrate the problem with "rear" mounted upper bars in a four link suspension.
4 LINK SKETCH.png
During acceleration the upper bars in the top drawing will pull the rear pinion angle "up". This defeats the whole "control" of the pinion angle purpose of a four link suspension. The suspension should be designed to limit pinion angle change during suspension articulation. The rear mounted bars will cause all kinds of traction and handling issues as the rear end moves and tries to rotate around two different arcs of travel.
This is not the way to build a good suspension...

Another concern is you asking about "cutting" the upper bars. IF this is an off the shelf suspension you do not want to start cutting things up and moving points around. Doing so changes the entire action of the suspension and will do nothing to improve it. Cutting will change the geometry to the point that you need to entirely redesign the system. Don't cut it up unless you know what yuo are doing.
Mark