Why I Use Delrin

On this upper inner control arm bushing, you can see the shaft is no longer centered in the rubber bushing. These bushings wear fast because the upper arm is shorter than the lower control arm and sees greater road action.

The original bushings in these arms don’t last more than three years, under regular daily driving conditions. With this type of bushing wear, you’ll find changes in your wheel alignment.

I cleaned, sand-blasted and repainted the control arms and replaced the old rubber bushings with new Delrin bushings. These arms will be installed back into Paul Windish’s 1976 Avanti.

The reason I use nylon polymer Delrin bushings, is because they hold up to aggressive driving conditions and do not deflect/move/squish in cornering as rubber bushings. They have a far longer driving life.

In the lower control arm shown above is a rubber bump stop still in great condition.

I also replaced the lower control arm bushings and installed new grease zerks. 

There’s a stiffer ride debate concerning rubber vs. nylon bushings. Because these bushings are regularly greased, there is free motion in the wheel action. With the installation of nylon bushings, the ride is not noticeably harder. 

*Note: The original factory installed bushings from 1951 to ’52 were steel bushings.

If you have a harder, harsher ride, check your tire size and heel weight. To alleviate a stiff ride, install lighter wheels and tires. Today’s wider rims and radial tires add un-necessary weight.

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