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The factory C5/C6 Corvette motor mounts are big, soft, oil-filled rubber isolators. They're excellent at keeping vibration out of the cabin.
They're considerably less exciting once heat, age, and engine movement cause the rubber to deteriorate, the mount splits open, and its oil begins decorating the underside of your Corvette.
AMT Vulcan Motor Mounts replace the factory oil-filled design with a fully captured 90-durometer vulcanized-rubber system surrounded by CNC-machined 6061-T6 aluminum.
GM had a perfectly reasonable goal with the original mount: isolate the chassis from engine vibration and make the Corvette pleasant to drive.
The result is a large, compliant rubber mount filled with fluid. As the mount ages and spends years living next to headers and a hot engine, however, the rubber can deteriorate and eventually crack.
Once that happens, the oil leaves the mount and the engine is left with dramatically more freedom to move around under acceleration, deceleration, shifting, and hard cornering.
At that point you've got an engine mount that isn't doing much mounting.
Soft oil-filled rubber does an excellent job keeping engine vibration away from the driver.
The tradeoff is considerably more engine movement and a fluid-filled mount that can eventually rupture with age and heat.
90-durometer vulcanized rubber dramatically reduces drivetrain movement while retaining a compliant element between the engine and chassis.
They're much stiffer than stock, but they're still rubber mounts—not a chunk of aluminum bolted directly between the engine and cradle.
Each mount uses two CNC-machined 6061-T6 aluminum cups to completely capture a pair of custom 90-durometer vulcanized-rubber pucks.
A hard-anodized 6061 aluminum center puck sits between the rubber elements, controlling their shape and preventing unwanted metal-to-metal galling as the mount works.
Rather than relying on one giant soft rubber bladder, the assembly keeps the compliant material contained and controlled while still allowing enough isolation to remain usable on a street-driven car.
Motor mounts have a fairly straightforward job. We concentrated on making them survive heat, control engine movement, and stay together.
CNC-machined aluminum housings completely capture the rubber elements rather than leaving them free to distort under load.
Custom vulcanized-rubber pucks provide substantially more drivetrain control than the soft factory oil-filled mounts.
The rubber is selected to live in the heat of the Corvette engine bay without requiring the heat-wrap gymnastics commonly used around some polyurethane mounts.
New M12 mounting bolts, washers, and security locknuts are included rather than asking you to reuse whatever came out of the car.
There's no magic material that simultaneously locks the engine in place and isolates the chassis exactly like a giant soft factory mount.
Vulcans transmit more engine vibration into the car than the stock oil-filled mounts. That's the inevitable tradeoff for substantially reducing drivetrain movement.
For a performance-oriented street car, track car, autocross car, or drag car, we think the trade is a very reasonable one. If your only priority is making the car feel as isolated as possible during the morning commute, the factory mount is still very good at that particular job.
We also offer a Race version of the Vulcan that is approximately 3/8-inch shorter than the stock-height mount. It was developed primarily to create additional clearance for applications such as a FAST 102 intake.
The correct choice for the overwhelming majority of C5/C6 applications. Maintains the normal engine position while replacing the factory mount.
Lowers the engine approximately 3/8". Only choose this version when you know your combination requires it and you have verified clearance around the crank damper, oil pan, leaf spring, intake, and surrounding components.
Seriously: don't order the Race mounts simply because your car goes to the racetrack. Lowering the engine changes clearances. Know why you need them before checking that box.
The compact Vulcan architecture creates additional room around the motor mount area compared with the bulky stock oil-filled mounts.
That can be particularly useful on dry-sump cars where large oil lines, fittings, headers, and everything else seem determined to occupy the same three square inches of Corvette.
At some point you can spend an awful lot of time talking about materials, durometer, captured-rubber architecture, and hardware strength.
Or you can accidentally conduct a more aggressive durability test.
We put the front of a Corvette into a wall at roughly 37 mph.The front of the car required substantially more attention afterward.
The Vulcan Motor Mounts?
We reused them.
Ask us how we know.
Vulcan mounts replace the factory C5/C6 oil-filled motor mounts and attach to the original engine-mount brackets and front cradle using the supplied hardware.
Installation can be performed by supporting and raising the engine one side at a time rather than completely removing the front cradle, although exhaust, headers, intake clearance, and the individual vehicle configuration can affect access.
We've put together full-color instructions covering the process, required tools, mounting sequence, and torque specifications.
The aluminum components of the Vulcan Motor Mount system are machined in-house at AMT Motorsport from 6061 aluminum, anodized for corrosion resistance, assembled with our custom vulcanized-rubber elements, and checked before they leave the shop.
We control the manufacturing because these were designed to be the last motor mounts we want you to buy for the car.
If any component of your AMT Vulcan Motor Mounts fails for any reason, we'll replace the failed part free of charge. No questions asked.
