Hydrogen-containing fuels have a "fuel value" based on their mass % the following compounds from highest fuel value to lowest:
Propane > cetyl palmitate > ethane > benzene > ethanol
The fuel injectors or fuel valves receive the fuel from the fuel pumps. The fuel must be atomized, or divided into tiny droplets, in order to burn entirely and at the proper time. These minute droplets should enter the combustion area far enough to combine with the oxygen.
When the droplets acquire heat energy from the hot air in the cylinder, their temperature quickly rises, and before they can ignite and burn, they reach the relatively cool surfaces of the liner and piston.
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