Recently, I made the decision to replace the engine mount bushings on my NA Miata. The stock engine mounts appeared untouched, indicating that the original 30+ year-old bushings were still on there! However, instead of opting for boring OEM bushings, I was eager to install stiffer ones, especially since this car will see some track time. Despite knowing that stiffer replacements might increase noise, vibration, and harshness (NVH), I was willing to accept it in exchange for improved performance.
That evening, I delved into research, scouring YouTube videos and forum discussions. Some googling later, I stumbled upon a product that piqued my interest: "Polyurethane Engine Mounts" from the UK, priced at just $69. Admittedly, the affordability surprised me, but the overwhelmingly positive reviews convinced me to take the leap. "F*ck it!" I thought. They arrived promptly, just in time for the weekend.
Upon initial inspection, I couldn't help but notice that the bushings resembled something out of a 3D-printed mold. I questioned how well the stud was secured in place, but I reasoned that such details were perhaps the trade-off for the budget-friendly price tag.
Installing the new polyurethane bushings proved relatively straightforward for the passenger side engine mount, benefiting from ample space compared to the driver's side. As anticipated, the stock bushing exhibited signs of wear and tear, reinforcing my decision to upgrade. Removing the old bushing from the bracket required little effort, merely involving the loosening of a single nut and a smooth slide out.
Transitioning to the installation of the polyurethane replacements, I encountered a problem. Despite my efforts to secure the new bushing with a ratchet, the stud failed to tighten properly. It soon became apparent that the stud was turning along with the nut, signaling a flaw in the product. Disappointing, indeed. If such challenges arose during installation, I couldn't help but question the durability of these bushings under regular driving conditions.
Reluctantly, I removed the polyurethane bushing and reverted to the stock one for the time being. As the age-old adage goes, "You get what you pay for." While I contemplate the possibility of returning the defective bushings, I'm inclined to invest a bit more and opt for a complete set of aftermarket mounts. After all, quality and reliability often come at a premium.
Update: A replacement bushing was supplied by manufacturer.