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| techtalk:ref:tools169 [2019/12/05 05:12] – hippysmack | techtalk:ref:tools169 [2024/01/24 22:52] (current) – 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 | + | 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 |
| 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' | And therefore the light' | ||
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| And conversely, it may see a 405° interval, think it's 360 degrees, and assume the motor is running slower than it is. \\ | And conversely, it may see a 405° interval, think it's 360 degrees, and assume the motor is running slower than it is. \\ | ||
| The bottom line is that many dialback timing lights can't make sense of it, for the purposes of determining rpm, and you get a wrong answer. \\ | The bottom line is that many dialback timing lights can't make sense of it, for the purposes of determining rpm, and you get a wrong answer. \\ | ||
| - | Really the only reliable way to make it work is to set the light' | + | Really the only reliable way to make it work on dual fires is to set the light' |
| - | | Dialback timing light. ((photo by Ryan M of the XLFORUM | + | | Dialback timing light. ((photo by Ryan M of the XLFORUM |
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