Poly mounts, Vibration & RPM

[only6]

Does there seem to be a sweet spot in the RPM band for vibration? I have only one 2nd design poly motor mount and at around 2500-2600 up to 2900+ you can really feel some vibration and then it tapers off after that.

I have a motor that has been balanced but it has been so long since I drove the car. I added the mount at the same time I installed the motor.

 

[JeffG]

Yep, I have the same issue to some extent. Mine is probably worst right about 1800rpm, but you can feel it throughout the RPM range, up until 3500 or so

 

[Marc87GN]

I have the one driverside poly mount and I haven't noticed any vibration. I have had my wife in the car and she never said anything. Since I setup the stock fan to run high all of the time when it comes on, I feel that vibration, but nothing from the engine so far.

 

[Race Jace]

man how long ago did you guys get those mounts. i have had zero vibration issues with the mounts that have been available for the last 4 years.

 

[JeffG]

Hahaha, Jason I bought my mount from you when they first came out. So, yes it's one of the older, harder versions. My car spends more time broken then running.

 

[Matt Sando]

i have the same vibration issue i have both mounts and vibration that rattles the dash.

 

[Race Jace]

I have a set on my car that i bought before i was even selling them. if you have vibration issues i would check to make sure the exhaust is not touching the body anywhere. once in a while after a hard launch the exhaust will tweak and slightly contact the body somewhere, it feels just like solid motormounts.

 

[2QUIK6]

I have polys in both sides on my GN and on my LT1 TA, and have no noticable vibration.

 

[ksmmspt]

After installing the driver's side on my GN, I had vibration. I checked the torque and I had not tightened and torqued them hard enough. I've had zero vibrations since. Double check the torque specs.