harmonics at 2-3k?

[416stroker]

Go get a scope and try to find the noise I bet its coming threw the bellhousing.


http://www.sears.com/shc/s/p_10153_1...0070921x00003a

These things do work believe it or not.

[MIKe30]

What flywheel are you using?

12 lb m20 flywheel from I forget what company. Bought it from here or e30tech. It was the guy that was selling m20 and m42 flywheels in the same thread, brand new.

Are the headers hitting anything?

I think they barely touch the sway, but that's not what is making the noise.

i was gonna ask what engine and tranny mounts you're using...specially the tranny mounts. free standing r3ving or only when moving/coasting?

clearance of headers and front sway/subframe. booster. If its the engine itself. Good luck to you mr. anjos.. jr..

tranny mounts are e30 g260 mounts with custom brace. The brace is a little low and the mounts are actually streched instead of compressed, but it's not a tranny driveshaft issue. Car is in neutral in my driveway and noise is constant whether clutch is pressed or not. Will try to get a video of it asap.

sucky sucky. bb soon with a vid...

[etxxz]

i was gonna ask what engine and tranny mounts you're using...specially the tranny mounts. free standing r3ving or only when moving/coasting?

clearance of headers and front sway/subframe. booster. If its the engine itself. Good luck to you mr. anjos.. jr..

[Spaz]

All in the driveway. last time was with me underneath it. This. Sucks.

What I can't understand is why it is only when it warms up. There is only the windage tray back there on that side of the pan right? I'll get a video today. Hoping it's something simple.

I can't imagine it making a difference but I used 15-40 dino oil when I changed the oil.

Are the headers hitting anything?

[NickP]

What flywheel are you using?

[MIKe30]

When you're letting it warm up, are you driving or just letting it warm up in a driveway?

Maybe try and eliminate clutch/flywheel/throwout bearing issues by letting it warm up without using the clutch.

Does frequency change with rpm?

-Cam

All in the driveway. last time was with me underneath it. This. Sucks.

What I can't understand is why it is only when it warms up. There is only the windage tray back there on that side of the pan right? I'll get a video today. Hoping it's something simple.

I can't imagine it making a difference but I used 15-40 dino oil when I changed the oil.

[Spaz]

When you're letting it warm up, are you driving or just letting it warm up in a driveway?

Maybe try and eliminate clutch/flywheel/throwout bearing issues by letting it warm up without using the clutch.

Does frequency change with rpm?

-Cam

[MIKe30]

seriously, I don't even know what to do right now. guess take it to a local bmw shop tomorrow see what they say. another fucking $70 towing this pile around. ughhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.

[z31maniac]

Fuck! I hope for your sake it's not the worst. I'm just now (2 1/2 weeks later) getting over my disgust of the headgasket popping after 225 miles in the car.

Ugh.

[MIKe30]

just got under there. I fear the worst.

It doesnt happen when the engine is cold, but when it warms up the noise begins. It's coming from the very rear of the oil pan. Anyone ever have this issue, and what was it? Will try to get a video soon. fml.

[MIKe30]

I'd start my search here, it should be smooth through the whole 360.

-Cam

Well after posting I realized what a dork post it was. I had the car in neutral in my driveway and it still makes the noise, which elimantes the driveshaft. Pressing the clutch down does not make the noise go away or change either, so that eliminates the clutch.

I'm going to put her up on jackstands soon. I'll find out what it is soon hopefully. I'm thinking my dad may have been right about a leak, but not a vacuum leak. Perhaps an exhaust leak of some sort OR maybe my exhaust is barely touching something causing as resonating type whiste/noise (perhaps the sway bar?) It really is a tight fit down there...

[Spaz]

It's a new CSB. I paid somebody a few bucks to press it on for me, but I wouldn't say it was the best job ever. The CSB was real smooth turning for about 3/4 of a turn, then it had some resistance, then real smooth again. Just put it on and hoped it didn't make a difference.

I'd start my search here, it should be smooth through the whole 360.

-Cam

[MIKe30]

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.

While I understand everything is connected in one way or another, what does the driveshaft have to do with the harmonic balancer on the front of the motor?

I did put the original one back on btw, no change.

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.

It's a new CSB. I paid somebody a few bucks to press it on for me, but I wouldn't say it was the best job ever. The CSB was real smooth turning for about 3/4 of a turn, then it had some resistance, then real smooth again. Just put it on and hoped it didn't make a difference.

Is this something that you feel or is it a noise that develops ?

Noise that develops.

what DS combo are you running? i had the same issue...new CSB and poof gone.

rear half is stock, front half is 325is from parts car, new csb, no dampener.

My dad swears it's a vacuum leak. Sounds like it's coming from underneath near tranny/exhuast/ds area. I'm probably going to play with this tomorrow. Too f'n hungover to do it now..

[e30Rob]

what DS combo are you running? i had the same issue...new CSB and poof gone.

[bostonbmw]

Is this something that you feel or is it a noise that develops ?