Blutwerks is gone..??
The sounds Randy had were rotary engine noise, Gnome/Oberusel.
In Stuart's Fokker D.VII there's a Mercedes engine pack, it's sampled from the real thing. I've since updated the set, but haven't upload it anywhere. This is probably a good time to upload that, and the rotary set. There's also a twin rotary set that I never put up, for the Caudron. A real racket.
Gimme a little time to get it all together. For the moment, you could download the Fokker D.VII and create an alias to it. That'll get you in business post haste.