Compute the BMEP in bar, mean piston speed in m/s and torque in Nm for a two stroke, four cylinder C.I. Engine having following specifications bore dia.150 mm, brake power 265 kW at 2400 rpm, L/d ratio of 0.90. Also identify whether this engine is square, over square or under square engine.

d = 150 mm = 0.15 m

No. of cylinders, $n_{1}$ = 4

No. of strokes / min, n = N = 1200 / min

B.P. = 265 kW

(i) Brake mean effective pressure ( bmep ) , $p_{mb}$ :

(ii) Mean piston speed,

(iii) Torque, T :

(iv) Squareness of the engine :

L = 0.9D = 0.9 x 0.15

L = 0.135 m

d > L, the engine is over square