![]() You always time the mark on zero on the tab, so if you want 18 deg advance, you set your ignition to 18 degrees advance (which would show the mark 18 degrees ahead of zero with a regular light) program the gun with 18 degrees of delay (ie: make the strobe 18 degrees behind or out of phase with the actual spark) so that you are still timing to the same 0 mark instead of a scale. 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. They all serve the same purpose but offer different RPM ranges, ability to operate a multi-spark system and offer features such as timing manual advance, a dwell meter, and the possible option to work on four-cylinder, six-cylinder, or eight-cylinder engines.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. What brand manufacturers offer automotive timing lights?Īutomotive timing lights come in three styles: inductive, digital, and self-powered. ![]() Not every timing light is compatible with MSD systems, so be sure to check that the one you want can meet these requirements before purchasing. To properly measure this sequence, the timing light must be able to show the beginning of the sequence. ![]() Typically, the distributor only provides a single spark for an ignition sequence, but in MSD systems, there are a series of them disbursed at a specific timing. How do timing lights help multiple spark distribution systems (MSD)?
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