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(a) Describe with the aid of labelled diagrams (both the piston-cylinder diagram as well as the ideal P-v diagram), the operational sequence of a:

i) four-stroke spark-ignition engine
ii) four-stroke compression-ignition engine
(b) What is the main difference between these two operational sequences? Explain.
(c) Spark ignition engines are typically sub-classed into being either the two- or four-stroke type.
i) Explain the operational differences between a two-stroke and four-stroke spark ignition engine.
ii) Which is typically more fuel efficient and which is more power-dense? – explain why.
iii) List any advantages and disadvantages to each configuration.