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There are two different timings you can advance. Cam timing or Ignition timing, I will assume you are reffering to ignition timing. lets first understand what happens in an engine with respect to this type of timing (short version). An ignition systems job is to deliver spark from the ign. coil to the cylinder at the predetermined time to ignite the air and fuel that has been ingested into each cylinder. For ease of understanding we'll focus on one cylinder. When fuel mixture is taken into the cylinder it is then compressed by the rotating assembly. The compressed mixture requires a spark from the spark plug (in other words high voltage jumps across an air gap inside the cylinder) this ignites the fuel and energy is then transformed into heat which forces the piston back down the cylinder bore. This is a"timed" event, spark is introduced a few degrees of crank shaft rotation before the piston reaches its highest point of travel or top dead center. So in other words fuel mixture actually begins burning as the piston is coming up. The important thing to remember is that fuel burns at a constant rate, however engine speed increases. As engine speed increases (RPM's) the spark needs to be introduced earlier and earlier or more degrees before top dead center. This helps burn more of the fuel in the chamber as it comes to top dead center. This burns more of the fuel enabling the engine to benefit from the complete burn of all the fuel in the chamber. Engines have mechanical devices or computers that automatically advance the timing. To add additional timing begins the spark, fuel burn process even earlier (more degrees before top dead center). In some applications this can be advantageous, in others it can cause pre ignition AKA detonation which can destroy an engine. If you need to know what specific timing recommendations are for your application one needs to know the specifics of your equipment and your goals. Hope this helps, there are many books about this subject that are much more in depth.

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15y ago

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