Custom Performance Engineering, Inc. has chosen to think outside the
box on this and come up with a completely new design. To do this, cp-e™
carefully studied the layout of the stock Focus RS rear motor mount.
Immediately after removing the rear mount it was decided that a better
design could be achieved. We built our Focus RS Rear Motor Mount off of
what we’ve learned from our very popular ST mount and modified the
principle to work even more effectively on the Focus RS.
The Ford Ecoboost engine mount system contains two side mounts that
provide a rotational mounting point. The rear motor mount is added to
help prevent the engine from swinging like a pendulum. However, the
design of the stock mount orients the bushing horizontally; allowing
applied stresses to act along two planes in the bushing. These types of
bushings are not really meant for this and it has been found that the
rear mount may be inadequate in preventing the engine from moving.
cp-e™ has come up with a way to apply stress to the bushing in only
one plane. By redesigning the whole rear engine mount cp-e™ was able to
mount the bushing vertically so that the pendulum effect of the engine
is compressing the bushing properly. Orienting the bushing in a way that
allows it to be compressed properly has allowed us to create a mount
that provides a stiffer system while still using a low 65 durometer
bushing.
cp-e™ goes a step further by using EPDM, a sort of rubber bushing.
Urethane begins to fail at temperatures as low as 200°F and generally
the bushings need a higher durometer rating to hold together. The Focus
rear motor mount is a perfect example of when not to use urethane. The
location of the mount allows a large amount of heat to be transferred to
the bushing. EPDM holds up to this heat, and doesn’t begin to break
down and fail. EPDM has a higher density than urethane, so the bushing
can have a lower durometer rating while keeping high reliability and
support. Why is that good? Higher durometer ratings transfer vibrations
through the vehicle and into the cabin, raising the NVH (noise,
vibration, & harshness) value.
To give you these benefits, the two 17.1lbs blocks of aluminum are
put in our CNC machine to be whittled down to only 2.17lbs. This process
takes a lot of time but was necessary to provide the design necessary
for the application.
Through initial testing our mount has shown to help hold the engine
properly in place while providing a low durometer bushing in order to
keep the in cabin vibrations low. It is to be expected that vibrations
will be added in some points of the driving experience, but this effect
comes solely from stiffening up the engine mounting system.
- Billet CNC construction
- EPDM Bushing
- Stainless Steel Hardware
- Vertically mounted bushing increase’s durability and effectiveness
- Stabilize the engine rotational movement
- Made in the USA
- Lifetime Warranty
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