So how do you choose what stiffness you need for your application?
The chemical engineering team at Innovative Mounts have formulated three general types of polyurethane bushings available in our motor mount kits.
This article will explain why we have the different options and how to choose the right one for your application. First, let's gain an understanding about the design of the OEM factory mounts.
Factory mounts are usually made of thin gauge metal stamped and partially inserted with a rubber material. The rubber usually has two or more sections that meet in the center to hold the center pin. These sections do not hold the motor firmly and are prone to break under sever driving conditions and/or when used in performance applications.
Innovative Mounts has engineered a unique polyurethane bushing unlike no other. Our bushings are solid, will never wear or break, and come with a life time unconditional warranty. A key design decision in our bushings is that it makes minimal physical contact with the mounting bracket or chassis. The shape of the urethane bushing is tapered to prevent binding between the chassis and/or mounting bracket. This allows the urethane to gradually absorb engine movement and vibration.
All of our bushings are designed in the same general shape. What varies next is the hardness or durometer rating of the urethane.
60A Red (250hp Max) - The 60A Red bushings are recommended for street cars. Most of our kits come standard with these bushings. They provide the least amout of vibration transfered from the engine to the chasis. This equates to a more comfortable everyday ride.
75A Black (500hp Max) - The 75A Black bushings come standard on all H/F - Series engines. These engines weigh more and need a stronger bushing. We recommend 75A for street and track vehicles that make more than average horsepower. This rating of bushing is also for those that would like a stiffer feel and less engine flex.
85A Grey (500+hp) - The 85A Grey bushings is designed specifically for race cars or drivers that seek a solid engine mount kit.
95A Red (500+hp) - The 95A Red bushings, the stiffest bushings offered by Innovative Mounts, is designed specifically for just as you'd expect... Extreme applications. This is not recommended for street applications. Select this stiffness for high HP/Torque engines only.