harmonics at 2-3k?

[So Live]

Harmonics scare me especially that whine mazurs talking about.

Is your CSB in good shape? Not reused or anything right? I had some pretty serious decel vibes and the new csb basically fixed it. Im not running the DS damper but i might try it next. Not sure if its just vibes from running through bolt poly mounts...

Keep us informed im interested in seeing what fixes this thing.

[mazur]

disconnect the driveshaft from the transmission. run it a bit and rev it up. if you still have the problem, i would say the harmonic balancer is wrong. i think it sounds like it may be the problem anyway. try putting your old balancer back on and run it that way.

I doubt free revving it is going to do anything. You need load on the engine.


The only experience I have with the harmonics being out of wack is when I ran an aftermarket LTW crank pulley way back when. At full throttle, right around 3.5k the car would sort of whine. You couldn't feel it, though.

[Pudmunkie]

Often times rotating assemblies are balanced at the factory. I am not sure how BMW does it but...

Try reinstalling the dampener that came from the factory, You'll notice that it has material removed in certain places; I doubt the one you bought has them in the same spot.

[flyboyx]

disconnect the driveshaft from the transmission. run it a bit and rev it up. if you still have the problem, i would say the harmonic balancer is wrong. i think it sounds like it may be the problem anyway. try putting your old balancer back on and run it that way.

[MIKe30]

Put a couple more miles on the swap car today. Seems like I have some kind of harmonics developing, mainly between 2-4k. Mostly when coasting or engine braking. It was getting worse the longer I was driving.

The original harmonic balancer on the motor looked pretty beat up, so I bought another one. I told the guy (I'll have to look up the members name, I want to say SQBimmer) that it was for an obd2 s52, and he said ok - he'd pull the right one. Looked pretty similar to my old one, but in better shape.

Two other things come to mind when typing this. I never got my driveshaft balanced before throwing it back on... even though mix matched, I did line up the white dots as best I could.

Secondly, I'm not running a driveshaft balancer but I'm pretty sure I have one. Should I throw one on? Doubt it's marked and it's not from the driveshaft that's currently in the car, does it have to be in a certain way or can it go on in any orientation?


Motor seems to vibrate a lot.

frustrating...