Hey all, not sure if this is news or not. I had to do some research to find it.
I installed an electric Focus rear motor mount (that is, the RMM from the electric version of the Ford Focus. Not an electric motor mount) a couple days ago. Ford PN CM5Z-6068-A. Available where ever Ford parts are sold, though likely special order. It's a solid runner rubber mount, instead of the stock hole-filled unit, and seems like a good compromise between vibration-inducing poly and th still-too-weak OEM ms3 mounts. The Focus ST guys have been using them for a year or two since they were "discovered".
Benefits that I have noticed:
1. Significant reduction in wheel hop, on both launches and (more importantly to me) corner exits under power.
2. Significant reduction in other engine motions - under braking, acceleration, and shifting especially, there much less shake/disturbance/aftershock (not sure exactly what to call it) than with the stock mount. Really, I didn't realize how significant these motions were, until they were gone.
3. Increase in overall "solid/tight" feeling of the vehicle. Going over a speed bump or expansion joint used to have some lingering shimmy/vibration for a split second, but that is now gone. Again, I didn't realize this impact of the engine shaking the entire car until it was eliminated.
Negative impact:
1. More vibration, primarily at idle. With A/C off there is barely-noticable levels of vibration. At idle with A/C on, there is noticeable vibration, but not objectionable, IMO. My wife will likely not notice unless I were to tell her. At engine speeds greater than 1000rpm, I can't tell any difference.
Overall:
Highly recommended. I feel this is a very good tradeoff of significantly better control of engine movements, for only slight increase in NVH at idle. This would not be the best choice for a big turbo 400whp car, or a dedicated track/AX machine (plenty of polyurethane mount options for that). For my goals of trying to keep this car a comfortable DD, I definitely think this is the best compromise.
I installed an electric Focus rear motor mount (that is, the RMM from the electric version of the Ford Focus. Not an electric motor mount) a couple days ago. Ford PN CM5Z-6068-A. Available where ever Ford parts are sold, though likely special order. It's a solid runner rubber mount, instead of the stock hole-filled unit, and seems like a good compromise between vibration-inducing poly and th still-too-weak OEM ms3 mounts. The Focus ST guys have been using them for a year or two since they were "discovered".
Benefits that I have noticed:
1. Significant reduction in wheel hop, on both launches and (more importantly to me) corner exits under power.
2. Significant reduction in other engine motions - under braking, acceleration, and shifting especially, there much less shake/disturbance/aftershock (not sure exactly what to call it) than with the stock mount. Really, I didn't realize how significant these motions were, until they were gone.
3. Increase in overall "solid/tight" feeling of the vehicle. Going over a speed bump or expansion joint used to have some lingering shimmy/vibration for a split second, but that is now gone. Again, I didn't realize this impact of the engine shaking the entire car until it was eliminated.
Negative impact:
1. More vibration, primarily at idle. With A/C off there is barely-noticable levels of vibration. At idle with A/C on, there is noticeable vibration, but not objectionable, IMO. My wife will likely not notice unless I were to tell her. At engine speeds greater than 1000rpm, I can't tell any difference.
Overall:
Highly recommended. I feel this is a very good tradeoff of significantly better control of engine movements, for only slight increase in NVH at idle. This would not be the best choice for a big turbo 400whp car, or a dedicated track/AX machine (plenty of polyurethane mount options for that). For my goals of trying to keep this car a comfortable DD, I definitely think this is the best compromise.
Last edited: