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Your system is the entirety of the gas, and no heat flows into or out of this system from the surroundings (the engine block) during the combustion step in the process.vcsharp2003 said:
Energy transformations in an IC engine cylinder
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In an internal combustion engine, the ignition of fuel transforms chemical energy into thermal energy, which raises the temperature and pressure of combustion gases. This increase in pressure forces the piston to move, resulting in mechanical work. The process is adiabatic, meaning there is no heat transfer across the cylinder's boundaries; instead, the energy change is due to internal energy from chemical reactions. While traditional thermodynamics often refers to heat transfer, in this context, the energy produced is considered internal energy change rather than heat. Thus, the internal combustion engine operates differently from conventional heat engines, as it does not involve heat exchange with the surroundings.
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