valve lag — The number of degrees of crankshaft rotation after a piston passes the top or bottom center of its stroke, at which the intake or exhaust valves open or close. For example, if the exhaust valve closes at 60° of crankshaft rotation after the… … Aviation dictionary
valve lead — The number of degrees of the crankshaft before the top or bottom center, at which the intake or exhaust valves open or close. For example, if the intake valve opens when the crankshaft is 25° before the piston reaches the top of the exhaust… … Aviation dictionary
valve gear — noun : any of numerous gears by which motion is given to the valves of an engine and especially a steam engine; specifically : such a gear for a steam engine by which the cutoff may be varied while the engine is running and the engine started,… … Useful english dictionary
valve gear — (in a reciprocating engine) the mechanism for opening and closing the valves at certain points in each stroke. Also called valve train. * * * … Universalium
Stroke ratio — In a reciprocating piston engine, the stroke ratio, defined by either bore/stroke ratio or stroke/bore ratio, is a term which is used to describe the ratio between the diameter of the cylinder bore and the length of the piston stroke within its… … Wikipedia
Stroke (engine) — Reciprocating motion, used in reciprocating engines and other mechanisms, is back and forth motion. Each cycle of reciprocation consists of two opposite motions: there is a motion in one direction, and then a motion back in the opposite direction … Wikipedia
Valve — This article is about the flow control device. For the game developer, see Valve Corporation. For the electronic component, see Vacuum tube. For other uses, see Valve (disambiguation). These water valves are operated by handles. A valve is a… … Wikipedia
Valve gear — The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle. It is sometimes referred to as the… … Wikipedia
Valve timing — In a piston engine, the valve timing is the precise timing of the opening and closing of the valves.In four stroke cycle engines and some two stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the… … Wikipedia
Stroke — For other uses, see Stroke (disambiguation). Stroke Classification and external resources CT scan slice of the brain showing a right hemispheric ischemic stroke (left side of image). ICD 10 … Wikipedia
stroke — stroke1 /strohk/, n., v., stroked, stroking. n. 1. the act or an instance of striking, as with the fist, a weapon, or a hammer; a blow. 2. a hitting of or upon anything. 3. a striking of a clapper or hammer, as on a bell. 4. the sound produced by … Universalium