Timing mark - 4D Cinema System Manufacturer - China 3D Theater System

Timing mark on pulley at 6 before TDC

Timing mark on pulley at 6 before TDC. A timing mark is an indicator used for setting the timing of the ignition system of an engine, typically found on the crankshaft pulley (as pictured) or the flywheel, being the largest radius rotating at crankshaft speed and therefore the place where marks at one degree intervals will be farthest apart. On older engines it is common to set the timing using a timing light, which flashes in time with the ignition system (and hence engine rotation), so when shone on the timing marks makes them appear stationary due to the stroboscopic effect. The ignition timing can then be adjusted to fire at the correct point in the engine's rotation, typically a few degrees before top dead centre and advancing with increasing engine speed. The timing can be adjusted by loosening and slightly rotating the distributor in its seat. Modern engines usually use a crank sensor directly connected to the engine management system. The term can also be used to describe the tick marks along the length of an optical mark recognition sheet, used to confirm the location of the sheet as it passes through the reader. See, for example, U.S. Patent 3,218,439 (filed 1964, granted 1965), which refers to a timing track down the left side of the form, and U.S. Patent 3,267,258 (filed 1963, granted 1966), which refers to a column of timing marks on the right side of the form. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (September 2007) Categories: Engine technologyHidden categories: Articles lacking sources from September 2007 | All articles lacking sources

Timing mark - 4D Cinema System Manufacturer - China 3D Theater System

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