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The same rod actuates the spindle of the gas valve. Both exhaust and admission are thrown out of gear by the governor if the normal speed is exceeded. If the engine is driven with gasoline a small oil pump is substituted for the gas valve-rod, and is controlled on the "hit-and-miss " principle by the governor.
A preserved hit-and-miss engine: 1917 Amanco 2 + 1 ⁄ 4 hp (1.7 kW) 'Hired Man' A hit-and-miss engine or Hit 'N' Miss is a type of stationary internal combustion engine that is controlled by a governor to only fire at a set speed. They are usually 4-stroke, but 2-stroke versions were also made.
The oldest engine technological predecessor for the variable-displacement engine is the hit and miss engine, developed in the late 19th century.These single-cylinder stationary engines had a centrifugal governor that cut the cylinder out of operation so long as the engine was operating above a set speed, typically by holding the exhaust valve open.
The Alfa Romeo Twin Spark engine, introduced in the 1987 Alfa Romeo 75, also uses variable valve timing. [3] [4] The Alfa system varies the phase (not the duration) of the cam timing and operates on the inlet camshaft. [5] Alfa Romeo's variator is a cylindrical chamber that contains a pressure chamber and piston along with helical splines.
A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.
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With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh charge. Engine designers ...
The Witte Iron Works was a maker of hit and miss engines. The company was started in 1870 by August Witte in Kansas City. His son Ed Witte built the company's first crude gasoline engine in 1886. In 1894 gas engines would be the company's primary focus. [1] They made the Witte's Junior Headless engine, Witte portables, and a Dragsaw. In 1911 ...