Abstract:
This paper presents experimental data of the effects of performance and emission using gasoline and compressed
natural gas (CNG) as fuel on a multi cylinder spark ignition (SI) engine. The engine used in this experiment is
Mitsubishi engine 4G91 model, 1.5L. The study was concentrated on engine performance parameters such as
brake specific fuel consumption (bsfc), brake power (BP), b ) and brake mean effective
bth
pressure (bmep) while exhaust emissions gas such as carbon monoxide (CO), hydro carbon (HC) and nitrogen
oxide (NOx) were being measured. The performance tests were conducted on Chassis Dynamometer with engine
running at varies speed and engine rpm ranging from 1000 rpm up to 4500rpm. The exhaust gas emissions were
measured by using an exhaust gas analyzer. The collected data was analyzed to assess the overall performance of
the engine at several engine speeds. The experiment is performed the comparison of the engine performance and
emission between engine that using different type of fuel; either with gasoline or with CNG. It shows that CNG can
reduce up to 50% to 80% of the overall emission compared to gasoline engine. However, the engine performance
reduces approximately 10% to 20%. Generally, it was expected that the performance will be reduced accordingly
due to the engine being designed is not applicable specifically for CNG application.
