Harmonic balancer

Dmak

Specialist
Nov 19, 2017
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09 bmw 135i
Just wonder if anyone every run into problems with factory harmonic balancer or with engine vibration as engine age and pushing 2 or even 3 times the stock power level. I did a bit of search and dont seems to find anything.
Reason i am asking is because i m thinking replacing my stock crank pulley just as maintenance since my car is over 10yrs and pushing almost 2 times the stock power with ps2 turbos. I also have mfactory smfw and raised my redline to 7500rpm. Would rather be safe than sorry.

Anyone knows if a failing crank hub/poor balanced bottom end can cause
1) hub to slip?
2) rod/main bearings to go?
3) oil pump failure(this was a problem with m54 from what i know)
4) timing correction/knock?
5) any other problems? Like broken crankshaft(which i dont think i ever seen one on n54)
 

doublespaces

Administrator
Oct 18, 2016
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AZ
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2009 E93 335i
I don't think theres a lot of info out there about this but doesn't ATI make one:
 

Dmak

Specialist
Nov 19, 2017
74
41
0
Ride
09 bmw 135i
I don't think theres a lot of info out there about this but doesn't ATI make one:

Yes. And its pretty pricey. A oem one would be half the price. Thats also something i want to consider. If no one run into problem with oem one while making higher power. Then oem pulley should be good enough.
From the look of it, no much experience/problem seems to run into with oem crank pulley which is a good sign.
 
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jzx_andy

Corporal
May 22, 2019
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Perth, Western Australia
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2008 E92 335i 6MT
I previously read that the aftermarket damper is quite helpful in mitigating chatter with a SMFW and can reduce that by about 80% on its own, but I'm not sure if they're even half as effective when stacked with a 800-1000rpm idle.

I am probably going to pick the VAC/ATI damper over an OEM one for peace of mind when I tackle the transmission swap, even though I'll be running a higher idle anyway. It's a lot of money on its own, but not so much in the world of a "nicely sorted" n5x street build (wheels/rubber, ST, fuelling, clutch/fw, suspension/bushings, lsd). AFAIK crank hub/pulley issues are not a concern for most unopened N54 applications.