Bob Bolles takes a detailed look at the function of the four-link suspension
The parallel four-link rear suspension is common to Dirt Late Model, Dirt Modified stock cars, and Sprint Cars. The original purpose for using the four-link suspension was to have a suspension system that produced very little, even zero, rear steer as the chassis moved vertically. Racers, being true to their nature decided to experiment with various angles in the four-link and found that zero rear steer was not the most efficient under all circumstances.
Photo Gallery: Dirt Four-Link Suspension - The Function of the Four-Link System on a Dirt Track - Circle Track Magazine
Source: http://www.circletrack.com/chassistech/ctrp_1107_dirt_four_link_suspension/index.html
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