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Ultra-Flex Rubber vs. Classic Polyurethane
Which is Better?
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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.....
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Daily driver or trailer queen?
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Sporty feel or cushion comfort?
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Engine finely tuned or tuned in a fog?
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Driveline survived a few drops or pristene?
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Hot and dry or cold and wet?
Compare Ultra-Flex natural rubber to Classic polyurethane.
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Characteristic
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Ultra-Flex
Rubber
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Classic
Polyurethane
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Vibration Dampening
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Excellent
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Fair
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Oxidation Resistance
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Good
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Excellent
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Petrochemical Resistance*
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Fair
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Excellent
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Temperature Rating**
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-60 to 185 (F)
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-30 to 185 (F)
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Heat Aging Resistance
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Fair
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Very Good
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Tensile Strength
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Excellent
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Excellent
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Weather Resistance
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Fair
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Excellent
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* 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.
What's the dog say? Around here, the Brown Dog's word is law. And since we're in the heat of the desert southwest, we run Classic Polyurethane motor mounts. (We also use our 2.5L Wrangler YJ as our daily-driver.) The Brown Dog likes the more secure feeling of knowing what's going on under the hood.
To minimize vibration, we always recommend changing transmission mount when changing motor mounts. We also strongly urge carefully following instructions.
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