The mineral fuels used recently, i.e., oil and gas, will be soon exploited out. This paper presents an idea of the engine where any fuel or solar heat can be used as a source of energy. The proposed model is an externally heated, 2-stroke, valve engine (EHVE). This is a piston-type engine,...

An old idea of how to increase the internal combustion (IC) piston engine power is presented. Such an engine has a 2-side action piston, which divides a single cylinder into two working parts. In these parts there are two usual 4-stroke engines which constitute one double IC engine, equipped...