What is the anti-squat percentage shown in this 4-link calculator?

The static geometry shows 68.458% anti-squat, dropping to 56.092% in the bump (compressed) geometry.

How much suspension travel is modeled and what is the pinion angle change?

The travel amount is 7.00 inches (1.00 in increments), producing a pinion angle change of 3.82 degrees.

What are the link lengths in this 4-bar setup?

The upper links are 31.686 in long with 10.440 in separation; the lower links are 38.000 in in static geometry and 39.319 in in bump geometry.

Where is the instant center in static geometry?

The instant center is at 144.231 in on the X-axis and 40.615 in on the Z-axis in static; in bump it moves to 84.332 in X and 23.502 in Z.

What roll characteristics does the calculator report?

Static: roll center height 30.490 in, roll axis slope -0.0184 in/in, roll axis angle -1.052° (Roll Understeer). Bump: roll center height 38.041 in, roll axis angle -11.949° (Roll Understeer).

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4 Bar Linkage Calculator v3.0 - 4-Link Suspension Geometry & Anti-Squat Data

4-Bar Linkage Calculator spreadsheet with geometry data and a plotted linkage diagram

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Suspension 4-bar linkage calculator spreadsheet with geometry data tables and a plotted link geometry diagram.

AI caption June 2011 · Photo 148 of 846

This document is a screenshot of a spreadsheet-based "4 Bar Linkage Calculator v3.0" used to design and analyze a four-link suspension, uploaded to the gallery of a 1961 International Scout 800. It shows static geometry and bump (compressed, 7.00 in travel) geometry for the upper and lower links, listing frame-end and axle-end coordinates (x, y, z in inches), link vectors, link lengths (31.686 in upper, 38.000 in lower static / 39.319 in bump), separation, unit vectors, intercepts, roll points, vertical/horizontal slopes, and link forces (6654 lb static, 8888 lb bump). Geometry summaries compare static vs. bump values: anti-squat drops from 68.458% to 56.092%, roll center height rises from 30.490 in to 38.041 in, roll axis angle changes from -1.052° to -11.949° (roll understeer), and instant center location moves from 144.231/40.615 in to 84.332/23.502 in. Pinion angle change over travel is 3.82°. A graphical side-view plot with Bump and Droop buttons visualizes the linkage, and data tables list front/rear tire coordinates versus rotation angle (0-240°), IC trace lines, anti-squat line, anti-squat CG line, and top-view link coordinates. This is a suspension design worksheet, not an OEM schematic, useful for anyone modeling a 4-link rear suspension.

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Frequently asked questions

What is the anti-squat percentage shown in this 4-link calculator?: The static geometry shows 68.458% anti-squat, dropping to 56.092% in the bump (compressed) geometry.
How much suspension travel is modeled and what is the pinion angle change?: The travel amount is 7.00 inches (1.00 in increments), producing a pinion angle change of 3.82 degrees.
What are the link lengths in this 4-bar setup?: The upper links are 31.686 in long with 10.440 in separation; the lower links are 38.000 in in static geometry and 39.319 in in bump geometry.
Where is the instant center in static geometry?: The instant center is at 144.231 in on the X-axis and 40.615 in on the Z-axis in static; in bump it moves to 84.332 in X and 23.502 in Z.
What roll characteristics does the calculator report?: Static: roll center height 30.490 in, roll axis slope -0.0184 in/in, roll axis angle -1.052° (Roll Understeer). Bump: roll center height 38.041 in, roll axis angle -11.949° (Roll Understeer).