Crank Scraper worth it in M42?

[sbarton]

The M20 guys that track their cars recommend getting a crank scraper. Is it needed for the M42?
What is the benifit?  

-Scott

[DesktopDave]

The scraper pulls oil mist from the crankcase, cutting down on the crank's aerodynamic drag and oil foaming.  I'm pretty sure it'd pick up a little power, but I suspect it'd be difficult to find one.  Fabricating one wouldn't be that hard.

From what I recall, M50's had one from the factory, cast integrally with the crankcase.

I stand corrected...here's one for $60:
http://www.crank-scrapers.com/bmw_m42.html

[rob_e30]

We run one in the race engine.  If you've got it apart, it's tough to beat for $70.