A single cylinder two stroke vertical engine has a bore of 30 cm and a stroke of 40 cm with a connecting rod of 80 cm long. The mass of the reciprocating parts is 120 kg. When the piston is at quarter stroke and moving down, the pressure on it is 70 N/cm2. If the speed of the engine crank shaft is 250 rpm clockwise, find the turning moment on the crank shaft. Neglect the mass and inertia effects on connecting rods and crank.