NICE video if W.Nr. 1227. This is the one that Paul Allen owns. There is a famous colour video of this bird when it was found in the 1990's.
http://www.youtube.com/watch?v=I1DYiPJAunA
First BMW801 I have ever seen runing!!!! Will be AWESOME to see her fly again!
Another link to the engine tests:
http://www.vintageradials.com/bmw801-engine.htm
Mike