polyurethane motor mount experience, why check your mounts??

[SkiFree]

Appreciate your not wanting to bash on anybody but .....

Seeing as how I made it my prerogative to fix old motor mount issues at IE there's no harm in it now. In short, I have not seen a single failure of the updated design released about two and a half years ago (outside of QC that is). A big part of it is the way the internal reinforcement is now configured, the other part is a different urethane compound. Anyone who calls up the office guys (or emails me) in regards to ANY old yellow motor mount is comped a set of the V2 Green mounts, even if it's been 6 years. This doesn't mean all the yellows were inherently bad (just pulled a pair out of the #13 2002 that had been raced on for 15 years), but there were certainly plenty that had well documented issues.


The mount as it stands now, is in my opinion the best on the market.

[e30onBBSs]

Ill never run those. There's a reason they are rubber from BMW!

Because Bmw is willing to compromise a tiny bit of performance for comfort price and durability

[wilholl]

Also I'm not seeing the damage to the subframe. The opening looks intended. Maybe I'm not looking in the right spot?

Yeah, I don't see any tearing. But it's been so long since I've seen a RWD front subframe I can't really be the one to say anything.

The opening in the pictures is not intended, it is were the attached pad for the motor mount bolt is tearing away from the subframe. Sorry i could not get a better angle for the pictures.

[efficient]

Since we are on the topic of motor mounts, I'd suggest you don't buy Meyle rubber motor mounts, they make the motor bounce around.

[Nesset]

Holy hell. Almost as bad as my 02's driver mount when it literally broke in half, though that was a 40 year old slab of crumbling rubber...

[ThatOneEuroE30]

How were your other mounts?

There's a reason no one uses poly for control arm bushings, or areas that are subject to actual movement. (The exception would be race cars that aren't used all the time, or people who don't know better.)

If these were subject to impact or excessive movement, then that's why this happened. Loose nut maybe? Once it had some free play, the constant bashing from the engine loading/unloading the mount would explain why it completely disintegrated.

well then I'm fucked haha Every mount on my car is polly

[Exodus_2pt0]

Mounts are fine, and control arms are OK, but they will wear out if subject to rotational forces sooner than rubber. I've seen it a few times, worse was on a set of leaf spring bushings on a lifted Silverado, the spring was riding on the center pin.

My ideal setup is poly drivetrain mounts, poly subframe bushings, rubber everywhere else.

[djjerme]

I was going to say, that looks like a weird failure. I have white poly mounts on the race car from a vendor on this forum, and they have worked fine for me. Even the Passenger that is somewhat melted due to the previous incorrect headers I had on the car is still working 5 years later..

[ThatOneEuroE30]

Mounts are fine, and control arms are OK, but they will wear out if subject to rotational forces sooner than rubber. I've seen it a few times, worse was on a set of leaf spring bushings on a lifted Silverado, the spring was riding on the center pin.

My ideal setup is poly drivetrain mounts, poly subframe bushings, rubber everywhere else.

I'm just poly everything. To be fair though. My car will see maybe 2000 miles a year. So its gonna take Me a while to wear shit out. Or at least I think...