Posted by jdemaris on December 30, 2008 at 13:50:49 from (67.142.130.18):
In Reply to: Re: Timing Question. posted by Guido on December 30, 2008 at 12:15:17:
An internal combustion engines uses ignition to light up a fuel charge and make an explosion.
A spark-ignition system uses an electrical spark to start the explosion. Most gas engines work this way. Ignition timing is usually referring to the time-of-spark. Doesn't matter where it occurs since it travels at 186,000 plus miles per second.
A diesel engine uses compressed air to make heat to ignite the fuel-charge, and is usually referred to a compression-ignition engine. Diesel ignition timing is usually referring to the time of fuel injection - but not always. Since fuel does not move at the speed of light there is always diesel-timing-lag. The lag is the time difference between the time of fuel injection, the time it takes for the fuel charge to travel from the injection pump and through the injector, and the actual time of useful combustion. That is why timing diesels can be confusing unless you know, for sure, what the timing specs refer to. GM and Ford usually give timing specs both ways - for time of injection at the pump, and also for time of combustion that's measured with a luminosity probe.
The glow plug in a conventional diesel is just a starting aid to help the engine start when it lacks combustion heat.
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