The Coates Spherical Rotary Valve System (CSRV) replaces the traditional Poppet Valves and all their associated parts, springs, guides, seats, retainers, cotters, pushrods, cam followers, camshaft, camshaft bearings, and many more parts including the oil.
The CSRV System is comprised of only two moving shafts and does not utilize oil pressure fed bearings, or oil spray; in fact, no engine oil is present in the head of the CSRV Engine. This means the engine oil does not see the hottest parts of the engine, which was the exhaust Poppet Valves. These extremely hot components usually are engine oil spray cooled. This heat would breakdown the atomic structure of the engine oil, thus lowering the oil viscosity, therefore, oil changes are recommended every 3,000 to 5,000 miles. On the other hand, with the CSRV incorporated in the engine design, oil change intervals are extended to approximately 50,000 miles or more.
The constant rotation of the CSRV, rotate away from the extreme heat of the combustion chamber, eliminating the possibility of hot spots in the combustion chamber; thus allowing for higher compression chamber ratios to be incorporated in the design of a combustion engine. This results in a higher thermal efficient engine and a more complete combustion that will utilize all of the energy contained in the fuel; also reducing harmful emissions.
