If the engine assembly is balanced real good and running correctly like it's supposed to, why the need for rubber engine mounts? Why not metal to metal? It seems like rubber engine mounts are masking a problem that shouldn't be there in the first place.
Why do cars have rubber engine mounts?
- Thread starter das_peikko
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Nick1994
$100 site donor 2024
No engine is THAT smooth.
Propflux01
$100 Site Donor 2026
Even a jet turbine engine is rubber mounted, and it doesn't have pulses like a 4 cycle engine does.
Why is the engine vibrating in the first place? If it's balanced well and running at optimal efficiency, why is it vibrating?
Originally Posted by das_peikko
Why is the engine vibrating in the first place? If it's balanced well and running at optimal efficiency, why is it vibrating?
As was noted, no engine can be that perfect. Perhaps if everything is carefully hand-tuned and only operating at a single engine speed like a locomotive one could get close to virtually no vibrations.
Why is the engine vibrating in the first place? If it's balanced well and running at optimal efficiency, why is it vibrating?
As was noted, no engine can be that perfect. Perhaps if everything is carefully hand-tuned and only operating at a single engine speed like a locomotive one could get close to virtually no vibrations.
Physics of NVH says you MUST have vibrations. .... All engines have natural vibrations. Inline sixes or v-12's have the least.
Rubber engine mounts allow the chassis to flex a little in turns and over bumps without causing high forces on the engine block too.
Rubber also dampens vibrations to some extent, converting a spread spectrum to heat energy inside the rubber.
Rubber engine mounts allow the chassis to flex a little in turns and over bumps without causing high forces on the engine block too.
Rubber also dampens vibrations to some extent, converting a spread spectrum to heat energy inside the rubber.
Originally Posted by oil_film_movies
Rubber engine mounts allow the chassis to flex a little in turns and over bumps without causing high forces on the engine block too.
THIS! ^^^
All cars need a little flex here and there.
Save the solid mounts for Drag Racing cars.
Rubber engine mounts allow the chassis to flex a little in turns and over bumps without causing high forces on the engine block too.
THIS! ^^^
All cars need a little flex here and there.
Save the solid mounts for Drag Racing cars.
LOL, go to an NHRA event, look at a fuel dragster or funny car, you will see a solid plate front motor mount. Ask them why they don't use rubber motor mounts!
If you had solid mounts, you would be crying till you found rubber mounts! Honestly, you do not want solid mounts, just let that thought go my friend.
If you had solid mounts, you would be crying till you found rubber mounts! Honestly, you do not want solid mounts, just let that thought go my friend.
So what you guys are saying is: If your car already has rubber engine mounts and you're STILL getting vibrations, you got serious problems!
Years ago, I removed the rubber engine mounts and suspension bushings from my GTI and replaced them with Urethane. It diminished the day to day driveability of this car. At first, I thought urethane felt better. But after a few thousand miles, the added vibration got annoying. And to think some of the highest performing cars of today use rubber mounts. For overall comfort, noise and vibration isolation, you cant beat rubber mounts.
Nick1994
$100 site donor 2024
Why are your shoes made of rubber?
Why not wear shoes made of aluminum and just walk smoother?
Why not have a hard plastic couch that's conformed to your body? If you'd just have perfect posture it wouldn't be a problem!
Why not wear shoes made of aluminum and just walk smoother?
Why not have a hard plastic couch that's conformed to your body? If you'd just have perfect posture it wouldn't be a problem!
Originally Posted by Michael_P
Years ago, I removed the rubber engine mounts and suspension bushings from my GTI and replaced them with Urethane. It diminished the day to day driveability of this car. At first, I thought urethane felt better. But after a few thousand miles, the added vibration got annoying. And to think some of the highest performing cars of today use rubber mounts. For overall comfort, noise and vibration isolation, you cant beat rubber mounts.
Actually Mercedes tend to use liquid filled motor mounts. Only drawback is that they eventually crack early and the liquid flows out and then the vibrations are even worse. But they're great when they're working right. You end up with a very smooth and quiet ride.
Years ago, I removed the rubber engine mounts and suspension bushings from my GTI and replaced them with Urethane. It diminished the day to day driveability of this car. At first, I thought urethane felt better. But after a few thousand miles, the added vibration got annoying. And to think some of the highest performing cars of today use rubber mounts. For overall comfort, noise and vibration isolation, you cant beat rubber mounts.
Actually Mercedes tend to use liquid filled motor mounts. Only drawback is that they eventually crack early and the liquid flows out and then the vibrations are even worse. But they're great when they're working right. You end up with a very smooth and quiet ride.
Here is how a failed engine mount looked like on the focus I recently had. The rubber collapsed and it was touching metal to metal on the bottom.
Inside the cabin it made a horrible sound, like the engine was about to fall out.
Reciprocating engines simply don't run as smoothly as it seems.
![[Linked Image]](https://www.bobistheoilguy.com/forums/attachments/usergals/2019/03/full-15440-30822-20190126_181130.jpg "[Linked Image]")
Inside the cabin it made a horrible sound, like the engine was about to fall out.
Reciprocating engines simply don't run as smoothly as it seems.
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