(a) One of the main problems encountered in the design of a diesel engine combustion system is the mixing of the air and fuel sufficiently rapidly to ensure complete combustion. Explain, using diagrams, how these problems are catered for in the design of

(i) large automotive diesel engines;

(ii) the smallest automotive diesel engines.

Give two relative advantages of each type of combustion system.

(b) Compare and contrast the combustion systems of diesel and spark-ignition engines in the forms they are applied to passenger cars.