Honda CivicX Rear Motor Mount Design Blog Pt 1
The Rear Motor Mount (aka RMM) found in your 10th Gen Honda Civic, and most any transverse mounted engines, is probably one of the most underrated performance parts you can add to your vehicle. I say that because changing this one part can have a significant effect to your Civic’s throttle response, torque steer, and traction.
In this first design breakdown we want to dissect the OEM Civic RMM design then go into the design and theory of the 27WON Performance RMM.
The OEM rear engine mount as found on a 2017+ Honda Civic SI, All the 10th gen models utilize this style of mount.
Above we see the OEM design found on all the 10th GEN Civics; Civic SI Sedan & Coupe, Civic Hatchback Sport, Civic EX & LX, and even the Civic Type-R. The design and construction of the OEM rear motor mount is pretty typical in the modern vehicle. There is a rigid body manufactured from cast aluminum with two ends designed to hold an elastic damping material and rigid pin or sleeve for fastening.
The next image of the OEM RMM gives us a clear view of the large end damper. This is constructed of a formed (or vulcanized) rubber bushing with the fastening sleeve embedded in the rubber. This bushing is then pressed into the rigid aluminum body for a relatively quick and simple manufacturing process. Now most importantly are the large open voids you see in the bushing. These are specifically design to reduce the amount of vibration transmitted from the engine into the vehicle chassis and eventually the passenger compartment.
What those large open voids also result in is a very soft RMM that numbs throttle response, reduces traction and helps induce torque steer. If you haven’t figured it out yet or don’t know; the engines in modern cars move and pivot in the engine bay A LOT; and the Honda Civic is no exception.
Now I would like to introduce the 27WON Performance RMM for your Honda Civic.
The difference is drastic to say the least. Now I can’t let all the design details out right now as we are still in the prototyping phase of the project, but I can go over some of the theory behind the 27WON RMM. First off let me point out that the above two images are both shown in the orientation that they would be installed in the Civic. This is important to understand for the next paragraph.
Second, you’ll notice that the 27WON RMM completely eliminates one of the OE bushings, the large one to be exact. This is done for a very specific reason to increase feedback and reduce Noise, Vibration & Harshness (NVH). We will get more into that exact design theory in the next blog.
Third, the rigid body is billet aluminum with the signature 27WON orange anodized finish (just wait till you see the MAF sensor housing in the 27WON Cold Air Intake System! We also utilize a polyurethane bushing and steel fastening sleeve. As mentioned before, we are still in the prototyping phase so we have not determined the ideal stiffness of the bushing, but experience tells me we will end up around 90A durometer as it usually provides the best balance of feedback and NVH.
So, why do you need a performance RMM? To get the absolute most out of your Honda Civic and the many performance modifications you put into it, plain and simple.
Stay tuned with 27WON Performance for the next update on the Performance RMM for your Honda Civic.