View Poll Results: Should I do Polyurethane Engine Mounts?
YES
90
91.84%
NO
8
8.16%
Voters: 98. You may not vote on this poll
Polyurethane Engine Mounts. Yes or No? Pros & Cons? (edit)
I was thinking about getting the poly motor mounts, and possibly trans, not sure about that one tho. Can't get much more vibration than I have now with the 408 and big cam. Hand on shifter = free massage.
Originally Posted by Screamin_Z
wow, I guess I'm too picky. I had the poly motor and tranny...did the mod to the tranny mount and it was WAY too much for me. I have all bolt ons, stage 1+ LS6 heads, 228R cam and spec stage 3 clutch it's also my DD. I went back to the stock mounts and put hangers on my Kooks catted Y pipe, I'd never do poly again.
Originally Posted by ArcticZ28
I was thinking about getting the poly motor mounts, and possibly trans, not sure about that one tho. Can't get much more vibration than I have now with the 408 and big cam. Hand on shifter = free massage.
I enjoy being able to dead hook 1st gear and not have the shifter look like a damn pogo stick. Wheel hop seemed to have SERIOUSLY decreased after the poly trans mount too. Now they just spin, instead of hop and spin
I'll give you my opinion on them. The stock rubber ones are nortorious for cracking and becoming weak.The poly urethane mounts are much better no rubbing issues against steering colum.You may feel a little vibration in the driver seat but to me that is alright and is no big deal
TECH Regular
Joined: Sep 2004
Posts: 404
Likes: 0
From: Raleigh, NC
Do it. My y-pipe does not hit anymore, the motor sits still, the shifter does not rock over under load. The car will vibrate more if you got a cam, but I do not notice it now I am so used to it. Will be a pain to install though, took me a while to get both of them in my first time.
i would assume that having poly motor mounts on a big cammed car would reduce engine vibation and transfer the vibration to the car? that way when you open the door it bounces up and down like 3" 
i am thinking about poly motor mounts when i do my exhaust here soon.
i am thinking about poly motor mounts when i do my exhaust here soon.
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I got the Poly tranny mount. Do you think that will stop my shifter from rocking when leaving from a stand still in first? That annoys me more than anything in the world!!
I think im gonna have to get the poly motor mounts too.
I think im gonna have to get the poly motor mounts too.
I installed a poly tranny mount a couple of years ago and immediately removed it 1 week later (went to a new stocker) because the vibration was terrible.
For this reason I was resisting poly motor mounts but I found that my engine was moving enough to start denting my LT's on the K-member even though they had a good 1/2" clearance at rest. I only got the driver's side in so far. It took most of a day to install but I am very glad I did it. The stockers were completely shot - you could slide the rubber inside the clamshell about an inch.
I have not noticed any real increase in vibration so I will be putting the passenger side in the week after next. I got mine Prothane's from Thunder.
Steve
For this reason I was resisting poly motor mounts but I found that my engine was moving enough to start denting my LT's on the K-member even though they had a good 1/2" clearance at rest. I only got the driver's side in so far. It took most of a day to install but I am very glad I did it. The stockers were completely shot - you could slide the rubber inside the clamshell about an inch.
I have not noticed any real increase in vibration so I will be putting the passenger side in the week after next. I got mine Prothane's from Thunder.
Steve
Originally Posted by dschmittie1
Where did you guys get your poly motor and trans mounts? I have check couple sponsers websites with no luck
Originally Posted by 6spd
I got the Poly tranny mount. Do you think that will stop my shifter from rocking when leaving from a stand still in first? That annoys me more than anything in the world!!
I think im gonna have to get the poly motor mounts too.
I think im gonna have to get the poly motor mounts too.
The poly trans mount will keep your TQ arm from raising your tranny (and shifter) up and down, the poly motor mounts will help keep it from rocking side to side.
Oh and BTW - I have an OEM rubber tranny mount in the for sale section if anyone has a broken one and wants an OEM one. They run over $70 from GM. :/shameless plug:
Originally Posted by s346k
i would assume that having poly motor mounts on a big cammed car would reduce engine vibation and transfer the vibration to the car? that way when you open the door it bounces up and down like 3"
i am thinking about poly motor mounts when i do my exhaust here soon.
i am thinking about poly motor mounts when i do my exhaust here soon.
Originally Posted by dschmittie1
Where did you guys get your poly motor and trans mounts? I have check couple sponsers websites with no luck
http://store.summitracing.com/partde...3&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
Links for the lazy ones
[QUOTE=TheBlurLS1] It was your tranny mount causing the vibrations you didn't like, you could have kept the damn poly motor mounts and went back to stock tranny mount. [QUOTE]
Ur wrong, I took my tranny mount out first...easiest to take out. It still shook too much for me and I only have a 228R cam.
Ur wrong, I took my tranny mount out first...easiest to take out. It still shook too much for me and I only have a 228R cam.
IMO, I want my car to shake a little bit. That gives it the muscular V8 feeling. I hope my poly motor mounts transfer more vibration to the seat of the car. Right now it's just my engine that jumps all around. My motor mounts are cracked and not doing much of anything.
I hope my poly motor mounts transfer more vibration to the seat of the car. Right now it's just my engine that jumps all around. My motor mounts are cracked and not doing much of anything.
Originally Posted by Screamin_Z
Ur wrong, I took my tranny mount out first...easiest to take out. It still shook too much for me and I only have a 228R cam.
"Too much for me" is the name of the game with building your own car. Some people have no qualms about their dumped duals, while others get tired of them and have them run out the back (ie - me). Some people would have no bigger than a 224 cam in a 346, while other have no less than a t-rex.
The point is that the benifits of poly motor mounts to 99.99% of people outweigh the *possibility* that you could feel some vibrations (that you would immediatly get used to).