| Summary: | The most energy requirement for Indonesia�s people are still fulfilled by
fossil energy resources. Renewable energy or new energy application for energy
supply is very important. Ethanol is one of many energy recourses that can be
used. One of the solution is use etanol fuel in motorbike. But that way etanol have
the nature of different with the gasoline fuel so difficult to mixed in the form of
fluid. Its for that needed a technology which can exploit the etanol in combustion
of gasoline motor and mixed in gas phase so that excellence etanol earn
application. The research was aimed to develop four-stroke engine by applying
Electronic Ethanol Injection System (EEI). The experiment was conducted to
recognize influences of ethanol fuel system changes to the engine performances
and exhaust gas emission. The results were expected to be useful for automotive
industry, mainly for improving the four-stroke engine and reducing air pollution
due to its exhaust gas emission.
The research used Honda PGM-FI (125 cc) and applied Fuel Injection
System designed for Honda Supra X PGM-FI. This technology is injection of
etanol into combustion chamber at the same time with the spraying of gasoline
fuel by gasoline injector. Mixing that happened in intake manifold will cause the
change of combustion characteristic in combustion chamber. The ethanol injector
was installed on the intake manifold with in-line toward their gasoline injector.
The change of the injection ethanol pressure was 1 bar, 1.2 bar, dan 1.4 bar.
The results show that the substitution of the ethanol fuel system has positive
impacts to the engine characteristics. In all ethanol pressure variations, there is
an acceptable decrease in performance, i.e. in the power down by 1,72 %, and is
increasing bsfc 8,89%. The exhaust gas emission were also improved, indicated
by 42,54% reduction of CO and 44,48% reduction of HC. The best engine
characteristic is obtained from the ethanol injector position with 1 bar.
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