AtoZ Fabrication :: Ultra-Flex Rubber vs. Classic Polyurethane

Ultra-Flex Rubber vs. Classic Polyurethane

Ultra-Flex Rubber vs. Classic Polyurethane
Which is Better?

Some swear by rubber bushings in their motor mounts. Others prefer the feel of polyurethane. We say, "It's a personal decision."

A few considerations.....

Daily driver vs. off-road king?
Sporty feel vs. cushion comfort?
Engine finely tuned vs. tuned in a fog?
Driveline pristene vs. survived a few drops?
Changing transmission mount with the motor mounts?

What's the dog say? Around here, the Brown Dog's word is law. And since he's nearing middle-age, we run on our proprietary Ultra-Flex Rubber motor mounts. (We also use our YJ as our daily-driver. Now days, we rarely attempt extreme trails).

Bushing Comparisons.

Characteristic	Ultra-Flex Rubber	Classic Polyurethane
Vibration Dampening	Excellent	Fair
Oxidation Resistance	Good	Excellent
Petrochemical Resistance*	Fair	Excellent
Temperature Rating**	-60 to 185 (F)	-30 to 185 (F)
Heat Aging Resistance	Fair	Very Good
Tensile Strength	Excellent	Excellent
Weather Resistance	Fair	Excellent

* Based on amount of bushing exposed in motor mount when installed on vehicle.
** Nominal performance retained within this range. Does not indicate failure outside this range.