How did we go from exhaust to plasma? Next is matter - anti matter...
Seemefly, the fuel burns in the engine. The tank, under pressure from the muffler or a pump, feeds liquid fuel to the carburetor via the needle valve, which regulates the amount of fuel that passes by and into the carburator, which gets in the air flow and becomes atomized or as a sort of wet vapor. The carb mixes the atomized fuel with air and creates a fuel-air mixture. Because air has oxygen in it, this is the agent that enables the fuel to burn.
So, when it goes into the engine on the intake and compression stroke (two stroke engines combine those into one action where four strokes have separate actions for each function) then as soon as the piston goes to the top of the stroke, the fuel burns, (which is an oxidation process) very fast and pushes the piston in the power and exhaust stroke, which is the second half of the two stroke function. The burned fuel then exits the engine as a gas, which is the result of the oxidation under heat and the expansion of the gasses is what causes the piston to move down. Inertia, or the property of matter to continue in motion, causes the pistion to begin the next process, or begins the two stroke process over again.
The fuel that enters the engine for burning also has the oil in it that coats metal parts in the bottom of the engine and lubricates it. The fuel/oil-air mixture that comes out of the carb and into the engine goes through the bottom of the engine, called the crankcase then is ported into the engine to the top of the piston on the bottom of and at the end of the power/exhaust stroke.
The gas that comes out of the exhaust port is the result of the burning alchohol and nitro-methane. The oil burns a bit, which causes the smoke, but mostly comes out as a hot liquid and goes all over your wing. Some fuel also comes out the exhaust as unburned fuel. It cools the engine. Without it, the engine would overheat and probably seize up.
The make up of exhaust was defined above. Mostly a burned or oxidized fuel-air mixture plus oil.
CGr.