A four cylinder, four stroke diesel engine runs at \(4500 \mathrm{rpm}\). The dead load on rope brake dynamometer is \(200 \mathrm{~N}\) and spring balance reading is \(22 \mathrm{~N}\). The mean effective radius of the dynamometer is \(0.6 \mathrm{~m}\). Find the brake power of the engine and its thermal efficiency if the b.s.f.c. of the engine is \(0.26 \mathrm{k} / \mathrm{kWh}\). Assume, C.V. of fuel used \(44000 \mathrm{~kJ} / \mathrm{kg}\)