Piston effort=load due to gas alone?

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SUMMARY

The discussion centers on the relationship between piston effort and gas pressure in internal combustion engines. It is established that piston effort is calculated as the sum of the force due to gas pressure and the inertia force. The inertia force is crucial as it accounts for the dynamics of the system, particularly during non-inertial frames of reference. Ignoring inertia would lead to an incomplete understanding of the forces acting on the piston during both idle and power stroke conditions.

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ajayguhan
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In my book it is mentioned that piston effort along the line of stroke=(Force due to gas pressure)+(Inertia force)

why we have to consider inertia force when it is a imaginary force which is considered only during non inertial frame?

why we don't equate piston effort with gas force simple (neglecting friction) why we have to consider inertia force?
 
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the work done during the power stroke is translated into motion energy whether that is just the piston / crank / clutch etc when idling, or including the remainder of the drive train and the vehicle itself when in gear.
 

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