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Old 04-12-2012, 05:06 AM   #1
Bdave
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Lets Talk Motor Mounts

I have not seen a discussion on this recently.

I dont give my motor mounts much thought really. Should I?
2005, 30k miles. Its not the mileage, its time passage that make me think.

How many people are on their OEM set still?

What is your opinion on solids? HPF Solids? What about delrin or poly mounts?

Please include noise, vibration and comfort in your explanations.
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Old 04-12-2012, 08:27 AM   #2
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Originally Posted by Bdave View Post
I have not seen a discussion on this recently.

I dont give my motor mounts much thought really. Should I?
2005, 30k miles. Its not the mileage, its time passage that make me think.

How many people are on their OEM set still?

What is your opinion on solids? HPF Solids? What about delrin or poly mounts?

Please include noise, vibration and comfort in your explanations.
Saad just switched me over to the solid mounts.

The stock mounts with 14k miles were not worn, however, did flex sufficiently, to the point where the new intake, and down pipe may have been compromised whilst under driving conditions.

I have yet to experience their feel/sound quality, and will report back with findings.
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Old 04-12-2012, 08:34 AM   #3
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Originally Posted by Bdave View Post
I have not seen a discussion on this recently.

I dont give my motor mounts much thought really. Should I?
2005, 30k miles. Its not the mileage, its time passage that make me think.

How many people are on their OEM set still?

What is your opinion on solids? HPF Solids? What about delrin or poly mounts?

Please include noise, vibration and comfort in your explanations.
i have 2006 zcp m3 with 160k miles.. original engine mounts are still good with no noise, vibration, etc...
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Old 04-12-2012, 08:40 AM   #4
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For a forced induction car I would definitely recommend a poly mount at least. If the car is making considerable amounts of power then a solid mount would be an option to look in to as long as you aren't too concerned with increased NVH.

Quote:
Originally Posted by 68 View Post
i have 2006 zcp m3 with 160k miles.. original engine mounts are still good with no noise, vibration, etc...
Have you physically checked and or measured the mounts to verify that? I'm at 100K and this past week I just replaced a bunch of parts as preventative maintenance. My passenger side motor mount was pretty worn, by eyeballing it I would say it was a good 1/2-3/4" shorter than the new mount I replaced it with.
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Old 04-13-2012, 09:24 AM   #5
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Originally Posted by dan avoN7 View Post
For a forced induction car I would definitely recommend a poly mount at least. If the car is making considerable amounts of power then a solid mount would be an option to look in to as long as you aren't too concerned with increased NVH.


Have you physically checked and or measured the mounts to verify that? I'm at 100K and this past week I just replaced a bunch of parts as preventative maintenance. My passenger side motor mount was pretty worn, by eyeballing it I would say it was a good 1/2-3/4" shorter than the new mount I replaced it with.
no i haven't measured the mounts.. i will change them if necessary. i always thought bad motor mounts make noise and vibration.. (we will see)
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Old 04-13-2012, 10:06 AM   #6
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no i haven't measured the mounts.. i will change them if necessary. i always thought bad motor mounts make noise and vibration.. (we will see)
It depends how bad the mount is.. The OEM mounts (like the majority of OEM bushings) are wear items and should be replaced ~100K miles assuming normal operating conditions, this mileage could be shorter/longer but that's a general rule of thumb. Even if you don't have any abnormal noise/vibrations the mounts could still be shifting under hard acceleration/braking which can lead to other parts wearing prematurely. There are certain parts that I agree "if it ain't broke don't change it" but I would highly recommend changing the mounts if they are at that high of a mileage. I guarantee at that mileage your mounts are squished down a good amount and once you change them you will definitely see improved feel/response when driving.
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Old 04-12-2012, 09:42 AM   #7
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i have 2006 zcp m3 with 160k miles.. original engine mounts are still good with no noise, vibration, etc...
uhhh u might want to measure them.....they shrink considerably and you will not really notice a noise........the stock mounts are pretty crappy
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Old 04-13-2012, 03:30 AM   #8
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uhhh u might want to measure them.....they shrink considerably and you will not really notice a noise........the stock mounts are pretty crappy
Not sure I understand your reasoning. If you don't notice a noise difference, nor odd wear from excessive engine movement, what's the point of replacing motor mounts?

And in what way are stock mounts crappy?
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Old 04-13-2012, 09:25 AM   #9
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uhhh u might want to measure them.....they shrink considerably and you will not really notice a noise........the stock mounts are pretty crappy
indeed, ill check them out..
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Old 04-12-2012, 11:15 AM   #10
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I know a good visual clue to bad mounts can be seen on non m engine mounts as they will create a hole in the hood insulation right above the power-steering reservoir cap. I changed mine out in the blown 330ci at 120k

On my current m3, @ 40k miles, last time I chcked it looked good will be looking for one at around 60k with new spark, and general maintenance
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Old 04-12-2012, 11:41 AM   #11
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I run the BimmerWorld Performance/Track Engine Mounts in both my race car & street 330Ci. They fit & work great, I perceive NO new noise or vibration (but you may) with these stiffer mounts. Forum sponsor BW makes a great product, I'd recommend these to anyone looking for an upgraded motor mount.


http://store.bimmerworld.com/bimmerw...unts-p930.aspx


Good luck,
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Old 04-13-2012, 10:16 AM   #12
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Originally Posted by Rob43 View Post
I run the BimmerWorld Performance/Track Engine Mounts in both my race car & street 330Ci. They fit & work great, I perceive NO new noise or vibration (but you may) with these stiffer mounts. Forum sponsor BW makes a great product, I'd recommend these to anyone looking for an upgraded motor mount.


http://store.bimmerworld.com/bimmerw...unts-p930.aspx


Good luck,
Rob.
I've been running these same mounts in my car for several years now and have been extremely happy with them. The car does "jump" quite a bit for a split second at startup until all the cylinders have started firing and they do transmit an ever so slight increase in engine growl into the cabin but otherwise they're hard to differentiate from stock in terms of noise and vibration - although you are more likely to notice if the car is running a bit rough as you'll start to feel some extra vibration in the cabin. There's just enough noise and vibration over stock to add a little character to the car without offending your passengers but they really do keep the motor fixed firmly in place relative to the stock non-M mounts (the M mounts are only slightly stiffer than the non-M and the BW mounts are significantly stiffer than both). For anyone looking for a civilized upgrade over the stock mounts, I'd highly recommend these.

I should also mention that they don't seem to compress down as much as the stock fluid filled mounts so they cause the motor to sit a few mm higher than stock. For most this won't be an issue but since my ESS TS already makes the fuel rail sit ever so slightly higher than stock, I can't fit the stock plastic fuel rail cover under my current strut tower bar (so I ditched the fuel rail cover).

I also gave a set of poly mounts a try for a few weeks and the vibration at idle with the A/C running was horrible plus there was a very nasty buzzing within the cabin when accelerating around the 2000-2200 rpm range. While acceptable for a track car, poly and solid mounts aren't really a good choice for a street car that sees much use.
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Old 04-13-2012, 11:39 AM   #13
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I've been running these same mounts in my car for several years now and have been extremely happy with them. The car does "jump" quite a bit for a split second at startup until all the cylinders have started firing and they do transmit an ever so slight increase in engine growl into the cabin but otherwise they're hard to differentiate from stock in terms of noise and vibration - although you are more likely to notice if the car is running a bit rough as you'll start to feel some extra vibration in the cabin. There's just enough noise and vibration over stock to add a little character to the car without offending your passengers but they really do keep the motor fixed firmly in place relative to the stock non-M mounts (the M mounts are only slightly stiffer than the non-M and the BW mounts are significantly stiffer than both). For anyone looking for a civilized upgrade over the stock mounts, I'd highly recommend these.

I should also mention that they don't seem to compress down as much as the stock fluid filled mounts so they cause the motor to sit a few mm higher than stock. For most this won't be an issue but since my ESS TS already makes the fuel rail sit ever so slightly higher than stock, I can't fit the stock plastic fuel rail cover under my current strut tower bar (so I ditched the fuel rail cover).

I also gave a set of poly mounts a try for a few weeks and the vibration at idle with the A/C running was horrible plus there was a very nasty buzzing within the cabin when accelerating around the 2000-2200 rpm range. While acceptable for a track car, poly and solid mounts aren't really a good choice for a street car that sees much use.
This is the best endorsement for the BW mounts so far. Thanks for a very comprehensive review. I know it will be most helpful when some of us decide ultimately what to do.

Poly just sounds more and more not the way to go for motor mounts.

For the time being I am staying stock. Stock engine mounts and stock durometer tranny mounts with those funky limiting cups. BW would be my first option for a more rigid mount.
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Old 04-14-2012, 11:34 PM   #14
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I thought I would add to this thread. I have been talking via PM with a member here about my transmission mounts. I am bringing this up because for a proper discussion IMO, we should be addressing BOTH sets of mounts at once...motor and tranny.

I emailed UUC about my Gen 1 questionable tranny mounts. I asked them if they would send me N/C their Gen 2 mounts in black for the transmission.

I am also considering Rogue Engineering heavy duty street mounts for M3 transmission. I dont know why they say dont bother for an SMG. Does anyone know why? I have SMG and it needs same mounts as 6 speed AFAIK.

http://www.rogueengineering.com/rogue/TM/TM.html

End result..maybe:
Motor Mounts: Bimmer world
Transmission Mounts: RE

What do you all think?
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Old 01-24-2013, 09:08 AM   #15
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Originally Posted by Rob43 View Post
I run the BimmerWorld Performance/Track Engine Mounts in both my race car & street 330Ci. They fit & work great, I perceive NO new noise or vibration (but you may) with these stiffer mounts. Forum sponsor BW makes a great product, I'd recommend these to anyone looking for an upgraded motor mount.


http://store.bimmerworld.com/bimmerw...unts-p930.aspx


Good luck,
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They definitely increase vibration- especially at idle.

And don't the Vibra Technics cost around $500?

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Old 01-24-2013, 09:14 AM   #16
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And don't the Vibra Technics cost around $500?
I paid about half that through the deal they were running on M3Forum. Total came out to ~$260 USD for the pair shipped to the US (they are based in the UK). No increased NVH when compared to a fairly new set of OEM mounts, yet a noticeable improvement in response and less of the "clunk" on hard shifts. I highly recommend them
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Old 01-24-2013, 10:21 AM   #17
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No increased NVH when compared to a fairly new set of OEM mounts, yet a noticeable improvement in response and less of the "clunk" on hard shifts.
Fair and accurate assessment. I too got these off of the group buy, and they also replaced a 5 month old set of OE E9X mounts.
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Old 04-12-2012, 12:17 PM   #18
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I had the Bimmerworld solid motormounts and they were a bit to loud at normal idle creating some vibrations that I didn't like. I could have raise my idle RPM but instead I reverted back to the OEM M3 motor mounts.
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Old 04-12-2012, 02:47 PM   #19
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I had the Bimmerworld solid motormounts and they were a bit to loud at normal idle creating some vibrations that I didn't like. I could have raise my idle RPM but instead I reverted back to the OEM M3 motor mounts.
Are you talking about the mounts in the link in the post above yours?
http://store.bimmerworld.com/bimmerw...unts-p930.aspx

They are not solid.
I have some time to think before i must decide. I would still like to hear some different mounts being used out there to help me to decide which ones I will eventually buy. I really an hesitant to buy purely solid mounts. I think there must be plenty strong mounts made in delrin or poly. Perhaps the Bimmerworld mounts. I would love to hear more. My goal is maximum strength with minimum deflection, noise and vibration. ie the best compromise.
Figure on a 800+rwhp car.
Thanks to everyone who posted so far. Good info.

I am kind of thinking something by AGK. They seem to be the "go to"company right now for mounts in a wide variety of hardness levels.

My tranny mounts are new UUC blacks with limiting cups BTW.

http://www.uucmotorwerks.com/html_pr...anny/about.htm

Transmission Mount Enforcer cup...cool concept, but do they work?
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Old 04-12-2012, 10:45 PM   #20
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anything UUC Sucks.....so you might want to change them now before they rip apart, i ripped both my tranny mounts and 1 engine mount apart from UUC, everything ive ever had from them is trash.

Anyways, I went back oem for engine mounts til I figured out what to do, so whats a good poly engine mount that wont rip apart.
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