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This direct-drive aero-engine is unusual in two respects: it is very oversquare with a bore:stroke ratio of 1.295:1, and it has a side-valve (flathead) valvetrain.The designer determined that since maximum continuous power output (65.3 kW [2]) was to be developed at only 2800 rpm, the extra weight and complexity of overhead valves (OHV) would be superfluous.
An illustration of several key components in a typical four-stroke engine. For a four-stroke engine, key parts of the engine include the crankshaft (purple), connecting rod (orange), one or more camshafts (red and blue), and valves. For a two-stroke engine, there may simply be an exhaust outlet and fuel inlet instead of a valve system.
Diagram of a typical gas turbine jet engine. Air is compressed by the compressor blades as it enters the engine, and it is mixed and burned with fuel in the combustion section. The hot exhaust gases provide forward thrust and turn the turbines which drive the compressor blades.
An oscillating cylinder engine cannot be reversed by means of the valve linkage (as in a normal fixed cylinder) because there is none. Reversing of the engine can be achieved by reversing the steam connections between inlet and exhaust or, in the case of small engines, by shifting the trunnion pivot point so that the port in the cylinder lines up with a different pair of ports in the port face.
In 1921, E. J. Hall began developing the valve system of Duesenberg racing engines and developed new cam lobe profiles that improved engines' reliability and power output. His research provided an understanding of the importance of the gradual opening and closing of valves and the effect this had on valve spring durability in high-speed engines.
Knight sleeve-valve engine. The first successful sleeve valve was patented by Charles Yale Knight, and used twin reciprocating sleeves per cylinder.It was used in some luxury automobiles, notably Willys, Stearns, Daimler, Mercedes-Benz, Minerva, Panhard, Peugeot and Avions Voisin.