For those looking for a Rear Motor Mount upgrade for your 4th GEN Mazda 3 or CX-30 but don’t want to add too much additional NVH, we are excited to release the CS RMM Inserts. The CS Inserts utilize the OEM mount and offer performance quality between the stock and CS Rear Motor Mount. This means you will get less NVH from the upgrade when compared to the CS RMM, which will be great when driving around town. While not being as aggressive as the full replacement CS RMM, you will see a nice improvement in feedback and responsiveness when pushing it on the back roads or in other situations in which you are utilizing the full potential of your Mazda. If you are interested in this new option, keep on reading for more specifics on how the CS RMM Inserts were designed.
NOTE: NVH (noise, vibration, harshness) is a standard term used in the automotive industry. NVH is a byproduct of changing some OEM components to aftermarket components in the pursuit of focused performance. Examples of components that can increase NVH: are engine mounts, clutch/flywheel, intake, exhaust, suspension, tires/wheels…and many more.
During the design process, we started with the Mazda 3 OEM rear motor mount and worked on modeling inserts that would completely fill the two openings. Once the initial designs of the two inserts were completed we began testing the samples and started with both front and rear inserts installed at the same time. Our initial impressions were quite surprising. We found that this combo resulted in the same if not more NVH than when the full CS Rear Motor Mount was installed.
Since the dual combo didn’t get us to where we wanted, we then tried each insert one at a time. This helped quite a bit and reduced NVH down closer to where we wanted. The issue we encountered when using only one insert was that the gear with worse NVH varied depending on whether we were in drive or reverse. This led us to trim and remove sections of the front and rear inserts to try and get the best of both worlds. By removing the center of the inserts, we were able to find a design that operated in line with our target performance levels. It ended up being a good middle ground between the stock and CS RMM. A comparison of the performance can be seen in the video below showing all three options.
Now onto some other specs of the CS Inserts. The durometer of the polyurethane we selected for the front and rear inserts is 70A. This gives the inserts enough flex to be installed into the mount without too much effort. This all allows for a tight fit so they do not work their way out during operation. Locking tabs were integrated into the inserts to ensure they remained installed in their correct position.
That covers the basics of the new CorkSport Rear Motor Mount Inserts for the 2019+ Mazda 3 and 2020+ CX-30. Head over to the website to learn more about the RMM and see additional pictures if you haven’t already!
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