Unformatted text preview: size of studs when the permissible stresses for the cylinder head and stud materials are 45 MPa
and 65 MPa respectively.
2. Design a cast iron trunk type piston for a single acting four stroke engine developing 75 kW per
cylinder when running at 600 r.p.m. The other avialable data is as follows:
Maximum gas pressure = 4.8 N/mm2; Indicated mean effective pressure = 0.65 N/mm2; Mechanical
efficiency = 95%; Radius of crank = 110 mm; Fuel consumption = 0.3 kg/BP/hr; Calorific value of
fuel (higher) = 44 × 103kJ/kg; Difference of temperatures at the centre and edges of the piston head =
200ºC; Allowable stress for the material of the piston = 33.5 MPa; Allowable stress for the material of
the piston rings and gudgeon pin = 80 MPa; Allowable bearing pressure on the piston barrel = 0.4
N/mm2 and allowable bearing pressure on the gudgeon pin = 17 N/mm2.
3. Design a piston for a four stroke diesel engine consuming 0.3 kg of fuel per kW of power per hour and
produces a brake mean effective pressure of the 0.7 N/mm2. The maximum gas pressure inside the
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- Spring '11
- Combustion, Internal combustion engine, pistons, Connecting rod, Engine technology, piston pin