What is the difference you can observe in the P-V and P-θ diagram of conventional spark ignition and compression ignition engines?  Draw the cylinder pressure curve as a function of crank angle...

What is the difference you can observe in the P-V and P-θ diagram of conventional spark ignition and compression ignition engines?

 Draw the cylinder pressure curve as a function of crank angle position for

advanced and retarded ignition timings in a spark ignition engine. Justify the

trends depicted in the graph.