walker Evans Coilover Shocks - emulsion Coilover Nitrogen - Photo 27224434

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4. These emulsion coilovers are pressurized with nitrogen to help force oil through the piston and prevent cavitation. Nitrogen pressure should not be increased or decreased to adjust the rate of the coilover. This should be adjusted through the coil spring rates and valving.

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1. A coilover isn't the most complex component on a rig. It basically consists of an aluminum body, a top cap and rod end (body loops) with spherical bearings, a lower cap (shaft passes through), a shaft, a piston, shims, a spring adjuster/upper seat, a dual rate slider, and a stop ring (not shown). However, the keys to a good off-road coilover are quality and choosing the proper valving and spring rate for the desired performance.

2. A coilover's compression and rebound performance is tuned through its internal valving. Compression is the upward stroke of the piston (when the wheel travels upward), and rebound is the downward stroke of the piston (when the wheel droops away from the vehicle). The piston and shims control the flow of oil in the coilover-preferred flow rates can be dialed in by changing the piston and by adding and removing shims.

3. The Walker Evans coilovers use a longer body to accommodate more oil. The longer body must be accounted for when mounting the coilovers on the vehicle. The body length is approximately 2 inches longer than the travel length. With a reservoir, the body length will not change; the coilover will carry more oil, allowing for more heat displacement.

4. These emulsion coilovers are pressurized with nitrogen to help force oil through the piston and prevent cavitation. Nitrogen pressure should not be increased or decreased to adjust the rate of the coilover. This should be adjusted through the coil spring rates and valving.