valve lag

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• 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

• lag — i. A delay or time interval in an instrument like the vertical speed indicator (VSI) or an altimeter between the actual event and its display. An altimeter lags in steep descent and very steep climbs, while some lag is inherent on all VSIs. ii.… …   Aviation dictionary

• Lag — Lag, n. 1. One who lags; that which comes in last. [Obs.] The lag of all the flock. Pope. [1913 Webster] 2. The fag end; the rump; hence, the lowest class. [1913 Webster] The common lag of people. Shak. [1913 Webster] 3. The amount of retardation …   The Collaborative International Dictionary of English

• Lag of the tide — Lag Lag, n. 1. One who lags; that which comes in last. [Obs.] The lag of all the flock. Pope. [1913 Webster] 2. The fag end; the rump; hence, the lowest class. [1913 Webster] The common lag of people. Shak. [1913 Webster] 3. The amount of… …   The Collaborative International Dictionary of English

• Lag screw — Lag Lag, n. 1. One who lags; that which comes in last. [Obs.] The lag of all the flock. Pope. [1913 Webster] 2. The fag end; the rump; hence, the lowest class. [1913 Webster] The common lag of people. Shak. [1913 Webster] 3. The amount of… …   The Collaborative International Dictionary of English

• Valve audio amplifier — A valve (UK) audio amplifier or vacuum tube (US) audio amplifier is a valve amplifier used for sound recording, reinforcement, or reproduction. Until the invention of solid state devices such as the transistor, all electronic amplification was… …   Wikipedia

• Lag screw — Screw Screw (skr[udd]), n. [OE. scrue, OF. escroue, escroe, female screw, F. [ e]crou, L. scrobis a ditch, trench, in LL., the hole made by swine in rooting; cf. D. schroef a screw, G. schraube, Icel. skr[=u]fa.] 1. A cylinder, or a cylindrical… …   The Collaborative International Dictionary of English

• 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

• lead and lag — The terms referring to the time between a valve opening and TDC or BDC (valve lead), and the time between TDC or BDC and a valve closing (valve lag); (compare valve overlap) …   Dictionary of automotive terms

• Walschaerts valve gear — The Walschaerts valve gear is a type of steam engine valve gear invented by Belgian railway mechanical engineer Egide Walschaerts in 1844. The gear is sometimes named without the final s , since it was incorrectly patented under that name. It was …   Wikipedia

• Blowoff valve — A blowoff valve (BOV) or dump valve is a pressure release system present in most turbocharged engines. Its purpose is to prevent compressor surge, and reduce wear on the turbocharger and engine. Blowoff valves relieve the damaging effects of… …   Wikipedia