![]() ![]() These require a timing light that has a degree dial. Some don't have scales on the tab, they just have a single mark. If it was 12 deg instead, you'd adjust the distributor (or knob or whatever means the ignition system allows) to advance more, and you'd see the stationary line move under the strobe and you'd dial it in until it showed 15.Īll it's doing is showing you a freeze frame of crank position in degrees BTDC at the time the spark occurs, the definition of ignition timing. Say you want 15 deg BTDC and wanted to confirm, you would note if the crank mark is at the 15 deg mark on the tab. But if you were to adjust timing while firing the strobe you would actually see that stationary line move up and down the scale on the tab in proportion to your timing adjustments. If you just strobe the crank pulley you will see a static line landing at some spot on the stationary indicator tab. ![]() ![]() When you adjust timing, you are changing the part of the crank that is captured on the strobe by making the light flash early or late. It will also flash in the same spot every time making the crank appear to stand still. Not sure if it's clear to you yet, but when you change ignition timing you also change when the light flashes since it uses the spark plug wire as a trigger. ![]()
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