Measurement of Fuel Consumption In I.C Engines

There are two ways of expressing fuel consumption

(i) By Volume

(ii) By Weight

I) Volumetric Type Flow meter :

Two glass vessels of 100CC and 200CC capacity are connected in between the engine and main fuel tank through two way and three way cocks. When one is supplying the fuel to the engine, the other is being filled. By using stopwatch, the time for the consumption of 100 or 200cc , fuel is measured.

II) Gravimetric Flow meter :

The efficiency of an engine is generally related to the kg of fuel consumed per unit time. Weight of the fuel consumed is directly measured by this method. It consists of a small glass tube which is attached to the main fuel tank. When the fuel rate is to be measured, the valve is closed so that fuel is consumed from the fuel tube. The time taken for a known value of fuel consumption can be measured.

Then the fuel consumption rate can be calculated by ,

Fuel consumption rate, kg / hr = (Fuel consumed * Specific gravity of fuel ) / (1000 * t)

Where, t - time per sec.

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