Achates Power
San Diego
Achates is testing a clean-burning diesel engine it plans to license to automakers next year. Conventional engines have one piston in each cylinder. Achates' design has two, an approach that delivers more power in less space, and that boosts mileage up to 100 miles per gallon.
Key investors: InterWest Partners, Madrone Capital Partners, Rockport Capital Partners, Sequoia Capital
