2/20/2023 0 Comments Magneto timing light![]() ![]() The higher the voltage, the faster the flashing. As Jim mentioned, your timing will be at full advance any time the engine is running. The higher the capacitance, the slower the flashing. Yes, the timing light will work fine on a magneto. It's one of the earliest forms of a 'relaxation oscillator'. The lamp will flash due to allowing the charging of the capacitor to it's ignition voltage, then, when the tube fires, the resistance goes very low and discharges the capacitor to well below the ignition potential of the lamp. Now, take a 1 megohm resistor and connect in series, completing the circuit with a source of 100 volts DC (or so). Without the resistor, the tube can either explode from the heat or quickly turn black on the inside from the metal of the electrodes 'sputtering' off and coating the inside of the glass.Īn interesting little experiment is to take an NE-2 and put a 0.1 (or so) microfarad, 100 volt (or so) capacitor across it. This is called the 'negative resistance effect'. The resistor is needed for operation at any voltage that the tube will fire at because when the neon gas ionizes and begins to glow, the resistance goes from nearly infinite to nearly zero. The magneto should not be installed until the internal timing is confirmed or corrected. The black clamp connects to the battery -, the red clamp to +, the green one to the breaker side of the coil (for RPM), the big black clamp in the foreground is an inductive pick-up that clamps around a spark plug wire. If the pin has to be removed and the rotor shaft turned 90 degrees so the contact points open and close, then the internal timing is possibly incorrect. Timing light, combination instrument with RPM, volt meter and dwell angle meter. The envelope is filled with neon gas and, in the case of NE-2's, the firing potential is around 60 volts. The timing light should turn on and off as the contact points open and close. NE-2's are what are called cold cathode glow tubes. ![]()
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