Polly bush engine mounts - Pros & Cons
Discussion
I can speak from some experience here.i replaced a rear gearbox mount with a poly mount leaving std rubber on the main left and right mounts.they do a better job of holding the motor and takes the slack out if the driveline it does feel better from that aspect but i couldnt live with the extra noise and vibration.
If you like lazy driving leaving the car in gear rather than dropping a gear you wont like this because the vibration is bad and it picks up on a labouring motor.
Pulling off 1st gear is the worst.you need to over rev to reduce the vibrations. I almost tjought it was clutch judder as they were changed together.
If you like lazy driving leaving the car in gear rather than dropping a gear you wont like this because the vibration is bad and it picks up on a labouring motor.
Pulling off 1st gear is the worst.you need to over rev to reduce the vibrations. I almost tjought it was clutch judder as they were changed together.
Edited by ToothbrushMan on Sunday 23 February 17:09
ToothbrushMan said:
I can speak from some experience here.i replaced a rear gearbox mount with a poly mount leaving std rubber on the main left and right mounts.
quick editing there !Done it myself and changed it back as soon as i could, way too much road noise and vibrations transmitted, did it on a sierra and a Mk6 escort, no idea what your car is ?
IMHO it's a waist of time on a street car as it adds nothing, no handling improvment, only really viable if there are issues with the origional rubber bushes not being strong enough and ripping regularly (like Passat front mounts for example) .
Edited by S0 What on Sunday 23 February 17:07
It's often a very good move with suspension bushes, as most of us will like a firmer response with less slack than the majority of buyers would want. You can knacker the secondary ride in some cases, but usually it's a decent trade-off.
I'd never, ever polybush a road car's engine mounts, though. A hell of a lot of tuning goes into the rubber mounts, all in the name of NVH control. Put something mega stiff in there and you can cause a lot of horrible effects, for very little gain in the driving experience. Leave well alone unless it's a serious track machine!
I'd never, ever polybush a road car's engine mounts, though. A hell of a lot of tuning goes into the rubber mounts, all in the name of NVH control. Put something mega stiff in there and you can cause a lot of horrible effects, for very little gain in the driving experience. Leave well alone unless it's a serious track machine!
Finlandia said:
OT a tad, but what is the view on poly bushes for wishbones? My T5 needs changing and I am toying with the idea of poly bushing it.
Polybushing my 850's suspension really helped - we swapped the lot at the same time as the ARB's, the car felt more composed but it did firm the ride up a bit as to be expected, not an easy DIY job if you don't have the proper tools and space to do it though.Axionknight said:
Finlandia said:
OT a tad, but what is the view on poly bushes for wishbones? My T5 needs changing and I am toying with the idea of poly bushing it.
Polybushing my 850's suspension really helped - we swapped the lot at the same time as the ARB's, the car felt more composed but it did firm the ride up a bit as to be expected, not an easy DIY job if you don't have the proper tools and space to do it though.Its worth noting that poly bushes don't last forever, they can erode/wear out of shape and its quite common for the mild steel insert to corrode into the bush causing it to seize in position, transferring any movement along the component until something snaps. A good mod is to make stainless inserts and use plenty of the correct grease.
Edit to say:
I'm talking more about suspension bushes rather than engine mounts here.
Edit to say:
I'm talking more about suspension bushes rather than engine mounts here.
McSam said:
It's often a very good move with suspension bushes, as most of us will like a firmer response with less slack than the majority of buyers would want. You can knacker the secondary ride in some cases, but usually it's a decent trade-off.
I'd never, ever polybush a road car's engine mounts, though. A hell of a lot of tuning goes into the rubber mounts, all in the name of NVH control. Put something mega stiff in there and you can cause a lot of horrible effects, for very little gain in the driving experience. Leave well alone unless it's a serious track machine!
I'd echo the above - they do make the car feel a bit stiffer, without making it actually stiffer. I'd never, ever polybush a road car's engine mounts, though. A hell of a lot of tuning goes into the rubber mounts, all in the name of NVH control. Put something mega stiff in there and you can cause a lot of horrible effects, for very little gain in the driving experience. Leave well alone unless it's a serious track machine!
It's worth casting around to read experiences from people who have done it to your specific car. Certainly on my car (Dolomite Sprint) there are a couple of bushes that definitely help by being polybushed, a few that don't, and one or two locations that seem to result in fractured suspension arms. (trailing arm suspension on a live axle; the best guess is that the original rubber bush was soft enough to allow the arm to rotate, but a polybush is too stiff and makes the arm twist instead)
I drained the oil from my engine mounts and refilled them with Flexane 80 from RS Components - its a repair rubber you mix and it sets. Dead easy.
Zero complaints but similarly zero improvements. No change in gear shift feel even under hard acceleration which was the claim I'd heard. Was a lot cheaper than new mounts so that's something!
Zero complaints but similarly zero improvements. No change in gear shift feel even under hard acceleration which was the claim I'd heard. Was a lot cheaper than new mounts so that's something!
ShaunTheSheep said:
I drained the oil from my engine mounts and refilled them with Flexane 80 from RS Components - its a repair rubber you mix and it sets. Dead easy.
Zero complaints but similarly zero improvements. No change in gear shift feel even under hard acceleration which was the claim I'd heard. Was a lot cheaper than new mounts so that's something!
That only works if you have hydromounts (fluid filled ones)Zero complaints but similarly zero improvements. No change in gear shift feel even under hard acceleration which was the claim I'd heard. Was a lot cheaper than new mounts so that's something!
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