A 4-stroke petrol engine of 2 litres capacity is to develop maximum power at 4000 rpm. The volumetric efficiency at this speed is 0.75 and the air-fuel ratio is 14:1. The venture throat diameter is 28 mm. The coefficient of discharge of venture is 0.85 and that for fuel jet is 0.65. Calculate:
- The air velocity at the throat and
- The diameter of the fuel jet.
The specific gravity of petrol is 0.76. Atmospheric pressure and temperature are 1 bar and 170C respectively.