What is Advance Ignition Timing in a car engine?

How to make an efficient upgrade to the engine increasing horsepower through ignition timing? Should an engine advance or retard timing to increase horsepower? This video explains the logic behind ignition timing tuning.
NOTE: "Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle." ~ Wikipedia. What happens when the timing is too advanced is the maximum pressure occurs before TDC, which pushes down on the piston when it is still coming up. This is what you are attempting to avoid when advancing timing.
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[@BWeezy-sw1wy]

Burn time is constant and so if the rpm is higher you have to start burning sooner.

[@djieKraf]

Woooa this video is so awesome my friend 🥰
thank you so much for sharing it with us,
your doing a great job keep it up,

[@TheMajdi86]

Sorry for asking noob question, can we tune ignition timing on dyno and used oscilloscope to monitor TDC and spark?

[@AdrianWahyu-cw2hy]

Quality of gas ( Octane number) also give effect right? But still , your explanation is correct. ? Thanks

[@kellismith4329]

Higher octane allows easier detonation

[@Verhellen-Automotive]

Octane number has actually nothing to do with the overall quality of the fuel. Lower octane fuel does not mean the fuel is of lower quality. Modern fuel has additives and refineries have quality standards by law (depending on your location) mostly focused on keeping engines run as efficient as possible with regards to air pollution. Higher octane gasoline is just fuel that has other chemical characteristics and a higher pre-ignition threshold. (Depending on the physical circumstances of the fuel. Fuel temperature, pressure inside the cilinder, atomization, etc.) Modern car engines that require high octane fuel, are engines that usually run slightly lean, hotter and with higher compression ratios. If you put lower octane fuel than advised in a modern engine you will lose some horsepower because the engine management will adjust parameters to burn the fuel as efficient as possible, and you are increasing the chance of getting engine knock or pre-ignition since the threshold in lower octane fuel is lower. I hope my explanation is clear and that it answers your question. 🧰

[@Verhellen-Automotive]

@@kellismith4329Higher octane is just a different chemical composition of the fuel or a higher pre-ignition threshold. If you have an engine knock; or pre-ignition problem, high octane fuel will improve the running of the engine, but actually counterintuitive and the opposite of what you are saying, the high octane fuel will theoretically be harder to detonate.