When you advance the timing it fires the spark sooner. (advance, get it?)

It will not affect pre-ignition knock since that is a result of combustion starting pre-ignition, before the spark. It is how a diesel engine works where compression of the fuel mix alone causes ignition and it can happen if your octane rating is so low that the mix ignites before it should, without benefit of a spark.

Timing will affect ping which results from firing the spark too early compared to the piston position. That is the threat of this timing wheel. It could cause the spark to happen too early in the cycle and give you a ping. Retarding timing, the way the EPA retards would have you do, can mean that the flame front has not finished before an exhaust valve opens.

Have a look at the glowing exhaust on a retarded timing engine to verify that things are still burning in the exhaust. No internal engine part should ever glow red, that happens right before the metal becomes so soft that it distorts. You may see steel glow red a bit at 1050 F and at 1100F it will start becoming soft and will glow a bright red. If you apply much pressure to the area at 1100F it will start to distort the metal.

Turk - 2013-09-12 12:42 PM Why were my three recently made posts removed?

TURK

It was good information Over there on the radio post