So I'm in the market for an upper control arm, my first choice was the Whiteline unit here:
Whiteline Mustang Adjustable Rear Upper Control Arm KTA141A (05-14 All) - Free Shipping - AmericanMuscle
But then I saw the bushing is "Synthetic Elastomer" , basically synthetic rubber. Whereas the rest of my stuff is BMR with the polyurethane bushings.
Upon reading up on the differences, I ran across this response from Whiteline about the very question, with some interesting points but this being a Whiteline rep I take it with a grain of salt, any thoughts?:
to answer the original question we originally designed a bushing compound to replace the brass bushings on hill climb vehicles. Over the years our business became centered more around general replacement thus our compound needed to change to minimize NVH associated with Polyurethane. In fact we also make many automotive and non-automotive polyurethane goods - our Polyurethane plant is one of the largest in the world.
Our principal formulation has evolved to what we now refer to as Synthetic Elastomer. It is a long chained polymer very similar to Poly but evolved to hold more desired characteristics such as higher tensile strength, elasticity, and memory.
It is for these reasons we have engineered features to minimize NVH such as scalloped designs, voiding, pin-holing and of course pocket knurling to maximize grease retention. In general we look at how an arm moves, how it articulates under various loads, the reason for the articulation and how it effects other components in the Suspension chain - then we design the bushings to allow or restrict those movements to optimize the suspension travel.
Just think about this..... the Mustang has progressed since the 60's to weigh more, go faster, more torque, more suspension demands and more mileage.... yet wheels have gotten larger since the 60's thus lowering tire wall size... if the car has progressed that much shouldn't you expect your bushings to evolve as well? Its a critical item to link between your tires and your steering inputs.
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