HCCI variable compression high gas flow ORBOX engine

, a very simple cheap 4-stroke variable combustion engine with proper sealing, lubrication and cooling. Twice the specific power of regular engines, half the cost, half the weight, 30% more fuel efficient. With hundreds of millions of small internal combustion engines produced yearly, there is a need for simple and cheap to produce 4-stroke engines. Small part count and simple manufacturing with forgiveness for production tolerances combined with proper sealing, cooling and lubri