1969 Torino

[Track Junky]

Originally Posted by Ron Sutton

If you draw a line through the CL of the UCA pivots & another line though the CL of the LCA pivots … they will intersect at some point (as long as they are not parallel). That point is called the instant Center (IC) … and the UCA/Spindle/LCA assembly travels in an arc from that IC point. However far out that IC is … measured in inches … is called the Swing Arm length. More on this later.

Next you draw a line from the CL of the tire contact patch at ground level … to the IC. Do this on both sides … and where the two “Tire CL-to-IC” lines intersect … is the front roll center. Look at the drawing below. The colored dots represent the IC for the same color LCA/UCA. The black dot represents the static RC at ride height.

Make sense?

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This is great stuff right hear Ron and please correct me if I'm wrong but it is darn near impossible to find IC with all the sheet metal in the way?........which in turn makes it impossible to find static RC. I'm getting ready to transform the front of my stock subframe from conventional spring and shock to coil over. Maybe I should p/u another stock subframe and start from there?

Also, when drawing the lines through the UCA & LCA's at the outside connection points of the arms are you drawing through the center of the connecting point at the top of spindle/ball joint?

Maybe I missed it somewhere but now that we know how to get roll center how do we find center of gravity?