Polyurethane Motor mount opinions.

**90ARAPAJ** · 08-23-2011, 04:19 PM

I recently took out my headers/ exhaust system to change the plugs/ wires and i replaced my trans mount so i was thinking should i replace my motor mounts? Here is my dilemma, i want to go to poly motor mounts but i don't want any vibration at all i just want the motor to have absolutely no flex when i punch it. I was going to put in a poly trans mount but everyone warned me how bad they were via the vibration issues. Also, another reason i would like to put in poly motor mounts is because my exhaust pipe hits my floor board under the drivers side every time its floored due to engine flex. Please give me some opinions people

**Knight** · 08-23-2011, 04:28 PM

Pretty much it's pick one or the other. If you give up flex, vibration transfer will increase. Perhaps a better option would be to secure the exhaust piping better, to reduce it's movement. Or, learn to live with vibration.

**tatertot91** · 08-23-2011, 04:36 PM

What kind of tranny mount did you put in? My honest opinion i would tell you to put the polys in. Your stock ones are most likely bad and i didn't really notice much of a difference with mine. My .02

**90ARAPAJ** · 08-23-2011, 04:51 PM

Originally Posted by tatertot91

What kind of tranny mount did you put in? My honest opinion i would tell you to put the polys in. Your stock ones are most likely bad and i didn't really notice much of a difference with mine. My .02

its pretty much a stock off brand trans mount, and how do i know if the stock motor mounts are bad forsure? And how do i secure my exhaust?

**tatertot91** · 08-23-2011, 08:35 PM

Best way i can tell is to pull em out, the exhaust hitting the floor is a sign they're worn and being that the car is 13 years old its probably begging for replacements. you did the tranny mount, can't imagine the motor mounts being a while lot better shape.

**mike171562** · 08-24-2011, 01:22 PM

I replaced mine with Poly's and It doesnt feel any different as far as vibrations, the headers still hit the floor a little, but not as bad as they did before the swap, the motor used to shake all over the place now its almost perfectly still. They are a pain in the ass to change, but worth it.

**pajeff02** · 08-24-2011, 07:01 PM

There is an aftermarket exhaust bracket that is designed to hold the Y-pipe away from the driver side floor bracing. Cutlass posted some info on it a long time ago -- I'll see if I can find it.

**pajeff02** · 08-24-2011, 07:08 PM

Here it is: http://www.ls1.com/forums/f63/kooks-...ml#post2262139

**90ARAPAJ** · 08-25-2011, 09:19 AM

Originally Posted by pajeff02

Here it is: http://www.ls1.com/forums/f63/kooks-...ml#post2262139

I have MAC headers/ MAC exhaust and i took that part of the exhaust that hits the floor out and crushed it myself, it did nothing. So explain to me if and hoe this bracket will eliminate my problem? Also, should i keep my mounts stock or go poly then?

**pajeff02** · 08-25-2011, 11:27 AM

I never needed to install one as after much fiddling I was able to get my system to clear the underbody brace and it has never banged. The bracket I linked would simply hold the Y-pipe away from the underbody.