Taking out polyurethane motor mounts

[packinkimber45]

Hey everyone. After reading all the threads on poly mounts and vibrations w/o balance shafts I dont want to have anymore vibration issues like I did before when my oil pump sprocket was out of phase. I heard that by keeping the front and rear motor mounts stock and only the side ones poly that I wouldnt feel as much vibration while keeping strength during shifts. Can everyone who has eliminated balance shafts and kept front/rear mounts stock and poly for sides confirm this for me based on experience. I am debating if I should keep all if any of my mounts poly or switch back to oem. Thanks.

 

[romeen]

In my experience it's the exact opposite. Look at this post from earlier tonight. The entire thread is a good read.

http://www.dsmtuners.com/forums/bol...ar-aluminum-motor-mounts-3.html#post151527080

 

[eclipsetuner_21]

I have prothane on my 91 and I just recently removed the balance shafts, I personally don't think it vibrates a lot. I would say keep all four and see how you like it. Takes a day or two then after that you don't notice it. Plus the hard shifts feel more stable. Trust me It feels nowhere as crazy as having the oil pump sprocket out of phase.

 

[packinkimber45]

So you have felt what an out of phase oil pump sprocket feels like? It was the most intense and annoying ride I ever had! It made me not want to drive the car at all. If you do know what it feels like having your oil pump out of phase feels like, was that on stock motor mounts or poly mounts? I'm wondering how much of a difference it is in vibration between not having balance shafts vs having the oil pump sprocket out of phase with balance shafts in place and having poly mounts. Can anyone else share their experience with vibration in relation to no balance shafts vs oil pump sprocket out of phase with balance shafts in place. I just dont want to end up having to replace my poly mounts with stock ones when my motor is already back in the car. Thanks.

 

[packinkimber45]

When I corrected my oil pump sprocket the vibration went away completely, atleast I couldnt tell a difference between having stock and poly ones as far as vibration. My question is since I eliminated my balance shaft will my car vibrate as bad as it did before with the oil pump sprocket out of phase? If I can get a lot of responses based on experiences it would be great. It would help me decide if I should keep my poly's or not. I just dont want that same vibration I had before my oil pump sprocket was out of time, it was the most annoying ride. Thanks again.

 

[Cs4g63]

Having the out of phase balance shaft vibration is much much much more worse than having the poly mounts. My first 1g came to me with out of phase balance shafts and it was so bad that the previous owner thought he had broken something.

 

[andy4g63]

If everything done right you shouldn't have any problems. My car has polyurethane motor mounts on left right and front. The only one I didin't put was the rear one, by advice from my mechanic, who saig from experience the rear mount causes the vibration. But on my car I don't feel a thing, everything is very smooth.

 

[Apeximprt2nr]

I have all 4 mounts polyurethane and no balance shafts. Easiest way to describe it is, put your car in third gear going like 5 mph, and thats pretty much what it feels like at idle.

 

[packinkimber45]

I have all 4 mounts polyurethane and no balance shafts. Easiest way to describe it is, put your car in third gear going like 5 mph, and thats pretty much what it feels like at idle.

That doesnt sound bad. The vibration I had was everything rattled inside especially the dash. The exhaust sounded like it was going to fall off. It was really loud. Hard to explain but it was definitely very intense, like something was broken or breaking. I might try leaving the rear stock. Hopefully if I need to change any when the motor is back in the car it wont be too hard where I have to take out the motor. Thanks guys.

 

[bob123131]

I have poly and my balance shaft removed and yes the inside panals due at times vibrtate a little, but nothing that bothers me in my daily and i think their are certain thigns worth putting up with to have the kinda power alot of our cars are pushing. It is nothing like an outof phase balance shaft though and i would recomend leaving out maybe the front or or driver side one if you are leaving some out because the back one is a pain to get in especially if you already have poly's in the others due to lack of movement. The front is an easy install.

 

[stockfornow]

To answer one of your questions with Balance shafts removed, the oil pump sprocket doesn't matter, so it won't cause the vibrations. Becaust the only reason that you have to align it is to align the BS itself which is attached to the oil pump. Hopefully it explains a little bit.

 

[packinkimber45]

To answer one of your questions with Balance shafts removed, the oil pump sprocket doesn't matter, so it won't cause the vibrations. Becaust the only reason that you have to align it is to align the BS itself which is attached to the oil pump. Hopefully it explains a little bit.

Sorry but I think you misread my post. I know I wont have to time the oil pump sprocket since the balance shaft has been eliminated. My concern was since they are now gone and I have a full compliment of prothane mounts that the vibration will be as bad as when I had an out of phase oil pump sprocket.

 

[packinkimber45]

I dont know what to do... I'm getting so confused. Some people I have talked to say leave the front and rear alone and leave the side ones alone and some people say vice versa. Then some say to do all but the rear. Now I am all confused as to how all the mounts work and what I need to do.

 

[packinkimber45]

I am going to be picking up stock sides and rear locally, I was wondering since it was out of a 92 gsx and my talon is a 91 looking at caps they are different part numbers. Will they not work for mine then? Does anyone know the differences between the two years and can someone confirm if there really is any differences? Thanks.

 

[packinkimber45]

If everything done right you shouldn't have any problems. My car has polyurethane motor mounts on left right and front. The only one I didin't put was the rear one, by advice from my mechanic, who saig from experience the rear mount causes the vibration. But on my car I don't feel a thing, everything is very smooth.

So do you have your balance shafts still in place or did you eliminate them?

 

[packinkimber45]

Okay, just to change it up a bit... After I got the out of phase oil pump sprocket timed correctly having all 4 prothanes the car didnt feel like it vibrated to me. So I know what it feels like having all 4 prothane in, since I have always had them in the car. It was completely fine as far as being tolerable once the oil pump was timed correctly. What I want to know is, now that I took out my balance shafts will it vibrate as much or close to when the oil pump sprocket was out of phase? Basically the difference in vibration between having the balance shafts and with them eliminated. Am I making sense here, I am starting to confuse myself. Scratch the out of phase oil pump sprocket from the picture because I had that corrected and it made "all vibrations" go away, so basically all 4 prothane mounts+balance shaft in place vs all 4 prothane mounts+balance shafts eliminated = will it vibrate as much or anywhere near as it did when I had the oil pump sprocket out of phase now that I eliminated the balance shafts. Sorry, I had to clarify that. I am driving myself nuts here. I am worried it will vibrate like it did before I correctly timed the oil pump sprocket, and if I dont go back to stock it seems like a real pain to switch back.

 

[eclipsetuner_21]

Ok, My oil pump sprocket was out of phase and I had all polly mounts. It REALLY rocked my s***!!!! Crazy vibrations, and now I have a crack in my windshield starting from it. But I also upgraded the front motor mount bolt to the size of the mount 5/8" If I remember correctly. I drilled out the outer holes to match the middle one.

Just one week ago I got my car running without the balance shafts installed and all around polly mounts with the upgraded front bolt. I like it and to me it does not vibrate very much at all. Its kinda like you wont even notice it a day or to after kinda thing. So just do it, you will like it!

To answer "so basically all 4 prothane mounts+balance shaft in place vs all 4 prothane mounts+balance shafts eliminated = will it vibrate as much or anywhere near as it did when I had the oil pump sprocket out of phase now that I eliminated the balance shafts?"

NO, your good to go