e30 m42 with e36 m3 mounts & idle vibration

[ccsdo5]

I sure hope you reinforced the crossmember, that sounds like a recipe for fatigue cracks.

Nope.



I have a spare cross member somewhere I plan to reinforce when I get the chance, but for now I just hope it holds.

[DER E30]

They were a little taller than my old sagging oem mounts, probably not much if any taller than new ones.

I'm worried about my crossmember. I see no cracks, but I have stiffer than stock mounts, a car with ~200,000mi on it, and the added stress of more than twice stock power output. I should probably drop it and weld plates in some day, it's just not an easy job to do in a driveway.

Yeah, what a pain in the butt to do. I had a whole afternoon in taking the whole suspension out and like 2-3hrs in making my own plates and another 5-7 hrs putting it all back together. The steering linkage and ps hoses take forever The car was down a whole weekend, and I was out there working on it most of the weekend ugh.

[roguetoaster]

There's a hole in the side of my subframe.

The e28 mounts also raise the motor a little, correct?

E28 mounts raise the engine slightly, but not enough to worry about. If it weren't for the constant abuse the track car takes it'd have stock mounts.

[varg]

They were a little taller than my old sagging oem mounts, probably not much if any taller than new ones.

I'm worried about my crossmember. I see no cracks, but I have stiffer than stock mounts, a car with ~200,000mi on it, and the added stress of more than twice stock power output. I should probably drop it and weld plates in some day, it's just not an easy job to do in a driveway.

[mrmckie]

There's a hole in the side of my subframe.

The e28 mounts also raise the motor a little, correct?

[DER E30]

I sure hope you reinforced the crossmember, that sounds like a recipe for fatigue cracks.

Word. My m42 killed the crossmember on stock mounts somewhere near 170k miles lol

[varg]

I have some solid UHMW mounts I got off a member for like $70. You want to feel a rattle, my car seems like it is going to shake apart when idling. I've been thinking of getting better mounts since the ones I have sit my engine a little higher anyway.

I sure hope you reinforced the crossmember, that sounds like a recipe for fatigue cracks.

[DER E30]

Raise your idle

[fresh_TD]

OE M42 mounts are $75 a piece. Totally worth it.

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[roguetoaster]

I have some solid UHMW mounts I got off a member for like $70. You want to feel a rattle, my car seems like it is going to shake apart when idling. I've been thinking of getting better mounts since the ones I have sit my engine a little higher anyway.

By better you of course mean stock M42. At last check they're available on rockauto for $17 each, and should still be in stock.

[ccsdo5]

I have some solid UHMW mounts I got off a member for like $70. You want to feel a rattle, my car seems like it is going to shake apart when idling. I've been thinking of getting better mounts since the ones I have sit my engine a little higher anyway.

[varg]

I have the green E28 motor mounts, they've held up to my abuse so far and I haven't noticed too much vibration. Another good cheap alternative to OE. Stiffer than old worn out stock mounts too, so good for turbo cars.

[fresh_TD]

$150 worth of motor mounts is expensive? Lol

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[mrmckie]

How are these mounts holding up?

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[roguetoaster]

As I said, the NVH/vibrations are gone - I think they were more related to the PS swap. The e36 m3 mounts are not solid, they are the same style as the stock m42 mounts. Rubber and hydraulic.

I'll keep an eye on them, I put the car on the lift at least once a week.

I understood all of that to be true when I replied. If you can do update this thread if you see the engine mounts shifting from starting position or signs of metal fatigue.