Anyone ever heard of Axial Vector engine?
Axial Vector Engines
http://www.axialvectorengine.com/images/avecutaway.jpg
Quote:
The Advanced Technology Demonstrator (ATD) Electric Power Generator is under current development. The Power Generator line will build upon the successful AVE-E design to achieve unrivalled levels of efficiency and power, ranging from 15 kW to one MW. Specifications for one of the engines currently under development include:
205 HP @ 2000 RPM
650 ft-lb torque @ 1200 RPM
93 cubic inch / 1500cc displacement
Four stroke operation
Electro-hydraulic valve control
12 cylinders and 6 double-ended pistons
50 mm bore x 65 mm stroke