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techtalk:ref:tools169 [2019/12/05 05:12] hippysmack [Timing Light] |
techtalk:ref:tools169 [2024/01/24 22:52] hippysmack |
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| ====== REF: Tools - 169 ====== | ====== REF: Tools - 169 ====== | ||
| ====== Timing Light ====== | ====== Timing Light ====== | ||
| - | A dialback timing light uses the TDC mark (the light delays the flash by the number of crankshaft degrees selected on the dial). ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1423947&page=2)) \\ | + | A dialback timing light uses the TDC mark (the light delays the flash by the number of crankshaft degrees selected on the dial). ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-electrical/sportster-motorcycle-electrical-and-ignition/132853-timing-question-on-a-1250-conversion/page2?t=1423947&page=2)) \\ |
| The dialback lights don't work well on dual fire Harleys, because they see twice as many sparks as there really are. \\ | The dialback lights don't work well on dual fire Harleys, because they see twice as many sparks as there really are. \\ | ||
| And therefore the light's calculation of rpm and how long to delay the flash are wrong. You have to select 56 degrees to get an actual delay of 28 degrees. \\ | And therefore the light's calculation of rpm and how long to delay the flash are wrong. You have to select 56 degrees to get an actual delay of 28 degrees. \\ | ||
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| Really the only reliable way to make it work on dual fires is to set the light's dial to 0 and look for the advance mark. \\ | Really the only reliable way to make it work on dual fires is to set the light's dial to 0 and look for the advance mark. \\ | ||
| - | | Dialback timing light. ((photo by Ryan M of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069628&page=3)) | | + | | Dialback timing light. ((photo by Ryan M of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/112805-883-to-1250-ignition-timing-confused/page3?t=1069628&page=3)) | |
| |{{:techtalk:ref:tools:dialback_timing_light_by_ryan_m.jpg?direct&300|}}| | |{{:techtalk:ref:tools:dialback_timing_light_by_ryan_m.jpg?direct&300|}}| | ||
