What is the purpose of ignition timing?
What is the purpose of ignition timing?
Ignition timing (or spark timing) controls when the spark plug fires during the Compression Stroke. Ignition timing is measured in degrees of crankshaft rotation, before top dead center (BTDC). In a perfect world, The spark plug fires.
How is the ignition timing adjusted?
To adjust your timing, all you need to do is turn the distributor housing one direction or the other, depending on whether or not you want to advance or move back the timing. If the rotor turns clockwise, you’ll advance the timing by rotating the distributor counterclockwise, and vice versa.
How is the ignition timing of an engine determined?
Ignition timing, in a spark ignition internal combustion engine, is the process of setting the time that a spark will occur in the combustion chamber (during the compression stroke) relative to piston position and crankshaft angular velocity. Setting the correct ignition timing is crucial in the performance of an engine.
What happens if ignition timing is too early or too late?
If the spark occurs too early or too late in the engine cycle, it results in excessive vibrations. It may also cause damage to the engine. Ignition timing also affects several variables. They include the engine power, torque, fuel economy, and also engine’s life to some extent.
When was electronic control of ignition timing introduced?
Electronic control of ignition timing was introduced a few years later in 1975-’76 with the introduction of Chrysler’s computer-controlled “Lean-Burn” electronic spark advance system. By 1979 with the Bosch Motronic engine management system, technology had advanced to include simultaneous control of both the ignition timing and fuel delivery.
How do you change ignition timing on a school car?
If you’re cool enough to have an older school car or truck with a distributor that you can put your hands on, adjusting the timing is as simple as giving the distributor a twist. You’ll need a timing light. With the light wired up per the instructions and the engine running, point the light at the main pulley that comes off the crankshaft.
How do you set the ignition timing on a GM car?
If you have a timing light, warm up the engine to normal operating temperature, disconnect and plug the vacuum line to the distributor, and set the timing according to the timing marks on the chain cover and balancer. Old GMs have a sticker near the rad which should tell you the timing spec at the correct idle speed.
Why does ignition timing depend on the temperature of the engine?
Also it is dependent on the temperature of the engine with lower temperature allowing for more advance. The speed with which the mixture burns depends on the type of fuel, the amount of turbulence in the airflow (which is tied to the design the cylinder head and valvetrain system) and on the air-fuel ratio.
When to change ignition timing for maximum power?
Optimum timing from a fixed (locked) ignition advance occurs at only one engine speed. Ignition timing is too advanced at engine speeds below that and not advanced enough at engine speeds above that. Changing the timing value up or down changes the engine speed up or down for the optimum ignition timing.
Electronic control of ignition timing was introduced a few years later in 1975-’76 with the introduction of Chrysler’s computer-controlled “Lean-Burn” electronic spark advance system. By 1979 with the Bosch Motronic engine management system, technology had advanced to include simultaneous control of both the ignition timing and fuel delivery.
