An experimental four-stroke gasoline engine of 1.7 litre capacity is to develop maximum power at 5000 revolutions per minute. The volumetric efficiency is 75% and the air fuel ratio is 14:1. Two carburetors are to be fitted and it is expected that at maximum power the air speed at the choke is 100 m/s. The coefficient of discharge for the venture is assumed to be 0.80 and that of main jet is 0.65. An allowance should be made of emulsion tube, the diameter of which can be taken as 1/3 of choke diameter. The gasoline surface is 6 mm below the choke at this engine condition. Calculate the sizes of a suitable choke and main jet. The specific gravity of the gasoline is 0.75.are 1 bar and 300 K respectively.

Nozzle lip, h = 6 mm = 0.006 m,

Swept Volume, V=

Total volume flow rate,

Volume flow rate through each carburetor,

Assume, air velocity at inlet,

Velocity at throat, is:

Pressure at throat,

Velocity flow rate at throat,

Choke area,

Let,

Main jet diameter:

But,

Where,