Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| techtalk:ref:tools169 [2019/09/11 05:39] – [Timing Light] hippysmack | techtalk:ref:tools169 [2024/01/24 22:52] (current) – hippysmack | ||
|---|---|---|---|
| Line 2: | Line 2: | ||
| ====== 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 https:// | ||
| + | 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' | ||
| + | However, even setting the thing to double is no guarantee it's going to work right, because Harley engines don't fire evenly. \\ | ||
| + | The firings occur at 315° and 405° intervals. So if the light sees two firings 315° apart, but assumes they' | ||
| + | It thinks the motor is running faster than it actually 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. \\ | ||
| + | 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 |
| |{{: | |{{: | ||
