Efficient engines

Military vehicles are in a class all their own, and the same is true for the US Army's HUMVEE replacement, which is rated at...

EcoMotors, a Troy, Michigan startup company revitalizes the two-stroke engine, making it 50 percent more efficient than currently-used four-stroke engines and less polluting. Even Bill Gates and Khosla Ventures invested a total of $23.5 million in them.

Typically, even a low-boost small engine turbo can deliver 25% more power than its non-boosted sister. That means that even a tiny turbocharged i3 can...

An Israeli firm called R-Jet Engineering has designed a new jet engine that could lower the fuel consumption by 25%. Just like current jet engines are twice as efficient compared to those built in the 1960s, this one, if applied on commercial airplanes, could offer significant savings in fuel and greenhouse gases.

German car magazine, Auto Test, has named the Mercedes Benz B200 CNG and the ML 250 BlueTec 4Matic as the most environmentally-friendly, giving them...

There was a sports car built in 1984 by Craig Henderson and Bill Green from Bellingham, Washington, and at that time it was able to set a record of 103.7 mpg for Guinness Book(in European terms, that's 2.27 liters/100km). Now they're reviving it with the help of the X-Prize Competition.

A better combustion engine is the one recently patented by Revetec, a small company from Australia. Their engine has been tested by independent parties. It has the same power as an ordinary engine, but it consumes half the fuel and it weights 50% less. It's also smaller than the average car engine.

Researchers from the University of Wisconsin-Madison have recently unveiled a concept engine that can be from 20 to 30 percent more fuel-efficient than classic models. It would also be substantially cheaper to produce, since the emissions are lower than those of conventional engines and expensive catalyst units are not needed any longer (in some cases, their price can reach that of the engine's).

Remember Justin Capra, the Romanian inventor of the jetpack? Well's he's done it again. Now, his ingenuity inspired him to build a small car that has a fuel efficiency of 784 miles per gallon! How about that?

The Waissi Engine is of an opposed-piston design, much like that being developed by Achates Power or EcoMotors, with one important difference: Waissi's engine...