Others With Noises After LTW Flywheel Install?

[bmwman91]

OK, so reading around on the web, it sounds entirely normal for people with lighter flywheels to have tranny rattle when sitting at idle with the clutch pedal up. Especially if your engine used a dual-mass flywheel originally, and you convert to a solid flywheel (with or without sprung disc). Ohm and especially if you have a Getrag tranny lol.

I also get a sort of rattling/grinding/groaning sound when engine braking / decelerating with my foot off of the gas and in-gear. Searching the depths of the interwebs, I have seen all sorts of other car forums with people complaining about this noise. In many cases, it seems to start after installing a LTW flywheel. Some people wind up finding dead TOBs and other broken stuff. Others seem to indicate that gear rattle/lash is typical upon engine braking with a LTW flywheel. Nobody mentiones long-term effects though.

In my case, I am running an 11lb M20 flywheel in my 2.1L M42 with hot cams and 11.5:1 compression (built by Metric Mechanic), and the overall flywheel+PP assembly weighs 14lbs less than stock. While the noise is irritating, I am trying to figure out if I it is relatively normal, or something to worry about? The noise is annoying, but if it is not an indication of compromised reliability or a problem, I can live with it just fine. All clutch components are new stock M20 parts.

Thanks guys!

Oh, and I installed AKG Delrin shift arm bushings (the one that the "bitch clip" goes through). That probably helps make noises more audible.

[e30leigh]

AAAAHHHHH learn much you must young tuner. learn much you must.

Getrag rattle is what you are talking about. It is so normal that it has a name.

Do not stress. Its very normal.

[FLG]

Yep completely normal.

Sent from my Galaxy Nexus using Tapatalk 2

[dashboardmonkey]

I have getrag rattle too. Completely normal. Don't worry about it until it starts clicking loudly. To be honest I don't think I have heard a getrag that doesn't rattle.

[Sagaris]

All my getrags have rattled
My jimmies remain unrustled

[Slovik]

A higher idle speed often helps with gear rattle and is good with a light flywheel anyway especially if you run A/C. I thought Getrag was German for gear rattle;)

[bmwman91]

Thanks guys. So...having a rattle/groan noise upon deceleration / engine-braking is no biggie then? Sorry to repeat a question, I can't tell if people are saying that the idle-rattle is normal (which I am now 100% sure that it is) or if they are saying that the deceleration noise is normal for a LTW a flywheel. Thanks!

[future rs]

Thanks guys. So...having a rattle/groan noise upon deceleration / engine-braking is no biggie then? Sorry to repeat a question, I can't tell if people are saying that the idle-rattle is normal (which I am now 100% sure that it is) or if they are saying that the deceleration noise is normal for a LTW a flywheel. Thanks!

Are you sure the deceleration is coming from the transmission? the bearings in the rear diff are known for the same noise. Although it usually means they need to be replaced.

[jlevie]

"Getrag rattle" is the noise made with the transmission in neutral and the clutch engaged and is from wear in the transmission input shaft bearings. A lightweight flywheel will make any wear in those bearings much more obvious. Unless really bad, the rattle can be ignored.

Rattle or vibrations when the transmission is in gear is not at all normal and indicates a more serious problem.

[bmwman91]

Hmmm, well in that case I need to get under there and start looking around.

[pandaboo911]

My old Getrag used to whine like a turbine when decelerating

[bmwman91]

Hmmm...did it ultimately die a terrible death as a result?

The noise that I get on deceleration is very very similar to that at idle, although mixed with other road noise so it is hard to really describe. Pushing the clutch in makes it go away though, just like at idle. There is no vibration that I can feel, just the noise.

God, let this thing hold together until January lol. I'm getting married later this month, and my fiancee has been a CHAMP in putting up with the fact that I have spent many weekends wrenching on this damn car (and not had it running since April). If I can make it until after the wedding & honeymoon, I can probably start making plans to convert to a 318ti driveline lol.

Then again, maybe the noise is just a noise and nothing really important. I do not really recall the noise being there when I installed the engine the first time a month ago (had to pull it 70 miles in due to a busted valve spring), but I was also not really listening for any new noises and it may well have been present then too. Anyway, I do not hear any bad noises when accelerating under part or full throttle, so if it was something really sinister, I think that I would hear it then too.

[pandaboo911]

No it didn't die, I think the whine was the result of the fluid not being changed for a long period of time. The tranny still shifted nice and smooth, no grinds, it was just loud

[fporro]

How's at the drive throughs?, can teller hear you ?

A while back someone posted about plastic pin at end of shaft deforming, then this brass units came available, would it cure it ? ...

Video ... http://www.youtube.com/watch?v=nnGQL...CKNp_XeufWE5vQ

http://www.allgermanauto.com/product/transmission-clutch-pivot-pin.html

[e30slidewayz]

No cure for the rattle. I just installed a lwf, new clutch, new throwout bearing, new pin thingy, the whole 9 yards. If you're input shaft is worn you'll have a little rattle when your in neutral and your foot is off the clutch. With the lwf, it's a lot more pronounced. No worries unless you start getting some absurd noises coming from it. Just try to ignore it lol... sucks when you're in a drive thru sitting there though, annoying as fuck.