![]() Simple timing lights may just contain a neon lamp operated by the energy provided by the ignition circuit. ![]() In few cases an engine is timed off another cylinder, such as the International Harvester V8 engines, which use #8, and the Isuzu 4Z series four-cylinder, which is timed off the #4 cylinder, or the 3 cylinder Saab two-stroke engine which is timed on the middle (#2) cylinder. On most automotive engines, the timing is set based on the #1 cylinder. The distributor can be rotated slightly until the reference pointer aligns with the specified point on the timing scale.įuel-injected engines, or engines with microprocessor controls may require special procedures to allow basic spark timing to be observed without control effects from the engine computer. A reference pointer is attached to the flywheel housing or other fixed point, and an engraved scale gives the offset between the spark time and the top dead centre position of the piston in the cylinder. The apparent position of the marks, frozen by the stroboscopic effect, indicates the current timing of the spark in relation to piston position. The timing light is connected to the ignition circuit and used to illuminate the timing marks on the engine's crankshaft pulley or flywheel, with the engine running. ![]() ![]() Modern electronically controlled passenger vehicle engines require use of a scan tool to display ignition timing. 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.Ī timing light is a stroboscope used to dynamically set the ignition timing of an Otto cycle or similar internal combustion engine equipped with a distributor. Timing light, combination instrument with RPM, volt meter and dwell angle meter. ![]()
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