الفهرس 
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Abstract
In the present work, measurements of performance and exhaust
gas emissions are performed for spark ignition engine using pure
gasoline and methanol/gasoline blends as a fuel. The present engi ne
is four stroke, four cylinder, water cooled spark ignition engine type
Fiat 1300.
The study is performed for different percentages of methanol ( 0
- 5 - 10 - 15 % ) in methanol/gasoline blends, variable engine speeds
(1000 - 2000 - 3000 - 4000 - 5000 rpm) and different throttle opening
positions (25 - 50 - 75 - 100 %).
The tests are carried out to evaluate engine power. engine
torque, volumetric efficiency, equivalence ratio. specific fuel
consumption, brake thermal efficiency. heat rate, exhaust gas
temperature and exhaust gas emission ( carbon monoxide - carbon
dioxide - hydrocarbon - nitrogen oxides - oxygen ).
The results indicate that the general tendency of engine
performance and emission variation against engine speed for the
methanol/gasoline blends is similar to that for pure gasoline. Besides.
there is no significant change in engine power and torque when using
methanol/gasoline blends as a fuel. However. it is also concluded that
there is an increase in volumetric efficiency, specific fuel consumption,
carbon dioxide, nitrogen oxides and exhaust gas temperature.
On the other hand, the tests reveal a decrease in the measured
values of the carbon monoxide and hydrocarbon content of the exhaust
gases and the calculated values of the equivalence ratio and brake
thermal efficiency.