Several engine tests using water/fuel emulsions have been
conducted. Abu-zaid [3] concluded that the addition of water in the
form of emulsion in fuel improves the combustion efficiency in the
diesel engine, hence the performance of the engine.
Several different methods of water addition have been developed
[4,5]. These studies have shown that further reduction of harmful
emissions is still possible. While the effects of water addition to internal
combustion engines has been an active area of research in recent years,
some of these studies have only measured external effects on exhaust
emissions, and fuel consumption. It is apparent that a little information
is available on the systematic investigation of the effects on the engine
performance. LPG has been commonly used as one of the cleanest
alternative fuel for auto-engines for more than 40 years. The aim of
the present work is to investigate experimentally the effect of the water
injection on the performance of a LPG fuelled SI engine.