Effects of Small Gasoline Engine Adding Pure Oxygen in Air Fuel Mixture

Abstract

The objectives of this research were to study the effects when filling up pure oxygen into a small
gasoline engine and compare the fuel consumption between the engine filled and unfilled with oxygen
for experimentation.
For the experiment, the gasoline engine with 1 cylinder and 4 stroke size 1.25 kW was used and
classified into 3 conditions included : (1) no oxygen filling up , (2) oxygen filling up before throttle
valve, (3) and oxygen filling up after throttle valve. The experiment was made in accordance with
engine speed viz; 1080 1440 1,800 2,160 2,520 2,880 3,240 and 3,600 rpm. The measurement of
oxygen flow, engine torque, cylinder pressure, specific fuel consumption and exhaust gas analysis
were made according to the 3 mentioned conditions through exhaust gas analysis machine.
The findings were as followed: When fill up pure oxygen in air-fuel mixture, the engine torque
was more increased and burning was more perfected than none of oxygen. The engine torque was
highest increased when filling up the oxygen before and after throttle valve, the flowing rate was at
700 cm3/min. The fuel could be more economized than none of oxygen. The comparisons of specific
fuel consumption was shown that oxygen filling up after throttle valve was more economized than
filling up before throttle averagely by 2.92 % and more economized than none of oxygen averagely by
7.29 %