Achates Power is working on an opposed-piston engine, an idea that has withered for decades. And they have money from Sequoia.
Companies are tinkering with the trusty old internal combustion engine design to boost fuel economy. Scuderi Group says its split-cycle design and air hybrid improves MPG by more than 50 percent.
News.com reporters list the five companies leading the charge in greening up the automotive industry.