Are Stages 2-3 and 1-4 in the OTTO Cycle Adiabatic?

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In the Otto cycle, stages (2-3) and (1-4) are indeed adiabatic, specifically isentropic, meaning they occur without heat exchange. This is because during these stages, the processes are reversible and adiabatic, aligning with the ideal assumptions of the cycle. The heat addition and rejection occur at constant volume, making them isochoric processes. The confusion may arise from the definition of adiabatic processes, which strictly involve no heat transfer. Understanding these distinctions is crucial for accurately analyzing the Otto cycle's thermodynamic behavior.
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hey guys, just wanted to know, in the graph of the OTTO cycle in the link

http://www.qrg.northwestern.edu/ther...Pv-diagram.gif

are stage (2-3) and (1-4) adiabatic or not, if so why are they

the reason i ask is that i have a graph showing that these stages are adiabatic, however, adiabatic processes are where no heat is exchanged QIN = 0
 
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In the ideal otto cycle

The expansion and compression are isentropic (reversible adiabatic).
The heat addition and heat rejection are isochoric (constant volume processs)
 
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