A six cylinder, four stroke petrol engine has the following data:

bore \(=8 \mathrm{~cm}\), stroke \(=10 \mathrm{~cm}\), clearance volume \(=70\) c.c., speed \(=4000 \mathrm{rpm}\), consumption \(=20 \mathrm{~kg} / \mathrm{hr}\), torque developed \(=150 \mathrm{Nm}\), C.V. of fuel used \(=43 \mathrm{MJ} / \mathrm{kg}\).

Calculate B.P., b.m.e.p., brake thermal efficiency, compression ratio, air standard efficiency and relative efficiency based on brake thermal efficiency. Assume, \(\gamma=1.4\).