5a) IC Engine parts: A four stroke diesel engine has the following specifications: Brake power = 5 kW; Speed = 1200 r.p.m.; Indicated mean effective pressure = 0.35 N/mm²; Mechanical efficiency = 80%. Determine (a) bore and length of the cylinder; (b) thickness of the cylinder head. Hints: For a four stroke engine, n = N/2; C = 0.1 and o₁ = 42 N/mm² Inlet Ignition system valve Piston causes a Spark plug spark Crankshaft Hot gases expand and force the piston down Terminal Exhaust Ceramic valve insulator Spark plug casing Central electrode Screw fitting Earth electrode 1. Intake 2. Compression 3. Power 4. Exhaust, 5. Spark plug