In internal combustion piston engine we burn fuel to heat up medium and rise pressure.
The earlier we ignite mixture the more time heat will have to penetrate pistons, cylinders and head. More of this heat will be absorbed by the engine.
If we retard ignition heat will have less time to be absorbed by the engine and more of it will be thrown out of the exhaust - that's wy EGT goes up when we retard ignition.
The more energy is spent pushing the piston, the less waste heat there is. First law of thermodynamics, such a difficult concept to grasp, I know.
Earlier timing causes higher PCP and more work extracted from the same amount of charge. It also causes a much shorter and faster burn. The time is important.
The charge is constant, you're not magically adding or removing energy by moving the ignition point.
You are simply controlling the amount that gets converted into motion and the amount exhausted as heat.
I really can't tell anymore if the problem is that your English is just bad or that you have some fundamental issues with concepts.
The earlier we ignite mixture the more time heat will have to penetrate pistons, cylinders and head. More of this heat will be absorbed by the engine.
In case this was true, then the lowest heat would be "absorbed" at ATDC ignition. Yet this will quickly melt the pistons and valves.
So no, in the context of heat transfer, there is much more total heat transferred to the combustion chamber, especially at the exhaust portion with retarded ignition.
There is no conversion of burned fuel into kinetic energy. Kinetic energy is related to velocity not thermal transformation.
Burning fuel is only needed to raise temperature of air in the combustion chamber.
When air in the combustion chamber get hotter according to 2nd rule of thermodynamic then pressure rises.
This pressure then push the piston.
Again, first law of thermodynamics. In the end, kinetic energy is extracted from oxidizing the fuel...
The fact that there is not a direct transformation is irrelevant. Yes, there is an adiabatic process in between, so what?