RETROFITTING OF AUXILIARY COMPONENTS TO ENHANCE THE PERFORMANCE OF A SINGLE-CYLINDER, AIR-COOLED GASOLINE TWO-STROKE ENGINE

Abstract

A unique stepped-piston engine was developed by a group of researchers at UTM. The
development work engulfs design, prototyping and testing over a predetermined period of
time. The aim is to demonstrate environmental-friendly capability producing comparable
output with low-fuel consumption. In its carbureted version, it incorporates a three-port
transfer system and a dedicated crankcase breather. These features will enable the
prototype to have high induction efficiency and to behave very much a two-stroke engine
but equipped with a four-stroke crankcase lubrication system. In the final stage of
development it was subjected to a series of laboratory trials for actual performance
evaluations. In an effort to further enhance its technology features, the researchers have
embarked on the development of an add-on auxiliary system. The system comprises of an
engine control unit (ECU), a direct-injector unit, a dedicated lubricant dispenser unit and
an embedded common rail fuel unit. This support system was incorporated onto the engine
to demonstrate the finer points of environmental-friendly and fuel economy features. The
outcome ofthis complete package is described in the paper, covering the methodology and
the final characteristics ofthe mobile power plant .