Michael Sturtz is that rare speed freak who hates the idea of spitting carbon into the air. So he built a biodiesel motorcycle-a really, really fast one.
Sturtz and his team at the Crucible, an industrial-arts group in Oakland, California, started with a BMW diesel car engine and fitted it to an old motorcycle. They spent weeks building a frame, linking the disparate pieces, and creating a fuel-delivery system with biodiesel-compatible parts. Then the engine's computer shut down the engine for four days. "It thought the car was stolen," Sturtz explains.