Timing mark: Difference between revisions
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[[Image:Timing marks.svg|thumb|right|300px|Timing mark on pulley at 6° before [[top dead centre|TDC]].]] |
[[Image:Timing marks.svg|thumb|right|300px|Timing mark on pulley at 6° before [[top dead centre|TDC]].]] |
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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]], |
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]].<ref name="beever">{{cite book |last1=Beever |first1=Colin |title=Ignition and Timing: A Guide to Rebuilding, Repair and Replacement |date=30 June 2015 |publisher=Crowood |isbn=9781847979742 |url=https://books.google.com/books?id=U2JGCgAAQBAJ |access-date=1 May 2023}}</ref> These have the largest radius rotating at crankshaft speed and therefore are the place where marks at one degree intervals will be farthest apart. |
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On older engines it is common to set the [[ignition timing]] using a [[timing light]], which flashes in time with the ignition system (and hence engine rotation) |
On older engines it is common to set the [[ignition timing]] using a [[timing light]], which flashes in time with the ignition system (and hence engine rotation).<ref name="popmech">{{cite news |title=Car Care Guide: The Timing Light |url=https://books.google.com/books?id=-dgDAAAAMBAJ |access-date=1 May 2023 |agency=Popular Mechanics |date=October 1981| publisher=Hearst Magazines }}</ref> Shining the light 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. |
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Modern engines usually use a [[crank sensor]] directly connected to the [[engine management system]]. |
Modern engines usually use a [[crank sensor]] directly connected to the [[engine management system]]. |
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The term can also be used to describe the timing patterns used in some [[barcode]]s, such as [[PostBar]], [[Data Matrix]], [[Aztec Code]], etc. |
The term can also be used to describe the timing patterns used in some [[barcode]]s, such as [[PostBar]], [[Data Matrix]], [[Aztec Code]], etc. |
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==References== |
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{{Reflist}} |
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==External links== |
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*{{Commonscatinline|Timing marks}} |
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{{Automotive engine |collapsed}} |
{{Automotive engine |collapsed}} |
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Latest revision as of 00:00, 15 March 2024
 | This article needs additional citations for verification. (May 2023) |
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.[1] These have the largest radius rotating at crankshaft speed and therefore are the place where marks at one degree intervals will be farthest apart.
On older engines it is common to set the ignition timing using a timing light, which flashes in time with the ignition system (and hence engine rotation).[2] Shining the light 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.
The term can also be used to describe the timing patterns used in some barcodes, such as PostBar, Data Matrix, Aztec Code, etc.
References
[edit]- ^ Beever, Colin (30 June 2015). Ignition and Timing: A Guide to Rebuilding, Repair and Replacement. Crowood. ISBN 9781847979742. Retrieved 1 May 2023.
- ^ "Car Care Guide: The Timing Light". Hearst Magazines. Popular Mechanics. October 1981. Retrieved 1 May 2023.
External links
[edit]
Media related to Timing marks at Wikimedia Commons
