INTENSE High Performance Polyurethane Upper Motor Mount for LSx Engines

INTENSE High Performance Polyurethane Upper Motor Mount for LSx Engines

$39.99

Part Number: LS4-PRO-UMMP

Shipping Weight: 1.00 pounds

5 out of 55 out of 55 out of 55 out of 55 out of 5 1 Customer reviews
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These Polyurethane inserts replace the stock motor mount inserts found in the upper dogbone mount. Made of top quality polyurethane and perfectly molded using advanced techniques these polyurethane inserts will help eliminate motor travel in high horsepower, hi torque applications while maintaining a smooth ride.

The following parts are included in this package:

  • 3800-PRO-FUM-xxx - INTENSE™ High Performance Polyurethane Front-Upper (Square) Motor Mount, Single
  • 3800-PRO-RUM-xxx - INTENSE™ High Performance Polyurethane Rear-Upper (Round) Motor Mount, Single

What is Polyurethane?
Polyurethane is a term used to describe a wide ranging family of elastomers (any compound exhibiting the characteristics of natural rubber; stretchy and elastic.). Poly meaning "many" and "urethane" the classification of the chemical structure. Polyurethane or urethane for short, is used as a solid cast material (bushings). Polyurethane can be as soft as a rubber band or as hard as plastic.

Is there a benefit over rubber?
Many advantages can be found over rubber. Depending on the formulation, urethane has a higher load-bearing capacity, greater tear strength, better compression set, greater abrasion resistance, tolerant to greases, oils and ozone and allows for more unique designs.

What's the difference between rubber and urethane?
Rubber is the sap of trees found mostly in tropical climates. The sap is altered by mixtures of carbon (why it's black) and mineral oils and various fillers. Polyurethane is completely chemical or man-made. Because rubber is a biodegradable product it is affected by ozone and will over time dry rot and degrade, while urethane will keep going and going.

Does urethane squeak?
In a word, no. Squeaking is caused by high frequency vibrations that can be heard rather than felt. It is usually caused by lack of lubrication, poor installation, incorrect part, or urethane that may be too hard for the application.

Does urethane ride really hard (harsh)?
The original rubber bushing or mount was fairly soft which helped to attenuate noise and vibration that is generated by the tires and road surface. Increasing the hardness of the bushing either with harder rubber, urethane or even bronze, will allow more transmission of noise and vibration. We formulated the hardness and design of these mounts to reduce this effect. Our softer urethane bushing allows the vehicle to perform better without added harshness, even over the same hardness rubber piece.

How hard are these to install?
Removing the mounts will be the hardest part. Once you remove the dogbone mounts from the car you can apply some WD-40 or other lubricant, reinstall the mount bolts, and pop them out with a swift hammer strike.

Average Customer Review: 5 out of 55 out of 55 out of 55 out of 55 out of 5 Based on 1 Reviews

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5 out of 55 out of 55 out of 55 out of 55 out of 5 Fantastic Responsiveness

Mike (Scarborough, ON) 2.6.2016

I installed this on my LS4 Buick Super (Allure/Lacrosse). The firmness and power to the ground has improved significantly. The harshness isn't significant at all (I was worried about this given that the Buick rides very well). I also have a lower poly mount. The only thing to note (and this is a combination of these 2 poly mounts and my lower) is that DOD is very harsh when engaged; best thing to do for the longevity of the vehicle is disable it anyway!

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