Suspension Bushings - Delrin, Rulon or Other

[Rick_L]

I know from my industrial experience that it's easy to screw up most any plastic part. Especially 2 part urethanes, and any molded rubber. One of the keys to molding or extruding plastic is to dry it according to the manufacturers specs. A really dumb error in manufacturing will show up when you make the part - it turns out like crap, easy to see it's unacceptable. More subtle errors yield parts that look OK but are weak or have a short service life. Process control is even more difficult on rubber than plastic.

Then there is choosing the wrong material for the application. Remember this carefully - there are hundreds of polyurethane compounds that could be used for bushings. Dozens for acetal (Delrin) or nylon. Likewise for rubber. Some manufacturers substitute cheaper materials, duh.

Just because GM used one material and it worked great doesn't mean the aftermarket duplicates it correctly. And just because some supplier like Energy Suspension uses one material successfully doesn't mean every competitor can, or that Energy Suspension (or anyone else) does it right every day. Sometimes you are at the mercy of your material supplier's quality also. There are just lots of ways to go wrong.