UnderDrive pulley damaging bearings?

[hondamanlxi]

anyone else heard this b/f?

I just ordered one for my crx and i stumbled onto d-series.com and they say underdriving cause excess wear on the bearings!? i just rebuilt my motor and i dont wanna do it again! Im really confused how an external pully can mess up an internal part, its not like the crank has play...

[A20A1]

if it is not ballanced then sure.
also too tight a belt tension puts on excess wear.

Maybe people broke their motor from driving it too hard and just blamed it on the pully.

Also the accessories will turn at different speeds from stock... this may pose some problems.

[Oyvind Ryeng]

Lightweight crankpullies does not dampen the harmonics from the crank, and this leads to exploding oilpump-gears, and excess wear of bearings. I would never put a lightweight crankpully on my engine; i'd rather get a ATI Fluidampr, and an aluminium flywheel (wich makes a helluva lot more difference in throttle response, and deacelleration etc.).