الفهرس 
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Abstract
The main target of developing the spark ignition engines is to reduce the hazard exhaust products emitted form these engines. It also aims to increase their thermal efficiency which turns require the increment of compression ratio. The latter can’t achieved in the conventional engines due to the abnormal combustion. There are many ways to accomplish this goal such as applying stratified charge technique.
Among the techniques of stratification is the use of divided-chamber system which fulfills to some degree the two basic requirements of stratified charge engines : 1- the inhibition of mixing prior to ignition to achive stratification, and -2- rapid mixing just before combustion and expansion for complete combustion.
Surveying of the available literature establishes the need for furthers research into the combustion characteristics of the stratified charge engines. The optimization of some of the controlling operating and design parameters are still a matter of controversy.
Therefore an experimental set-up was established with the objective of studing the combustion process in divided-chamber stratified charge engine by the injection of different fuels in the pre-chamber followed by oxygen injection with each type of the fuels. therefore the study focused on the effects of the degree of stratification, the pre-chamber volume, and the time of fuel and oxygen injection upon the engine performance and combustion characteristics at different compression ratios and speeds.
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Tests were run on a Ferryman A30 marine water-cooled engine with 95 mm cylinder bore and 82 mm stroke. The engine is modified to be a divided chamber stratified charge engine and it was prepared with different facilities to obtain maximum possible flexibility both in the range over which engine design and operating parameters.