الفهرس 
Chapter 1 : IntroductionOnly 14 pages are availabe for public view
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Abstract
Recently the world have turned to compressed natural gas instead of Iraditional gasoline as a fuels for their cars. For the former doesn’t produce the same amount of emission as the latter fuel.
A Historical review of available published work was introduced and showed the need for extra work on studying the effect of some designing parameters on emissions, noise level, and vibration response, so as to achieve the ideal employment of the engine fuelled by compressed natural gas
Within this work, it became possible to convert a spark ignition engine of passenger car Fiat 125p, commonly used in Egypt. So as to work on either compressed natural gas or gasoline by the same ignition circuit. This study includes the description of measurement instruments of the experimental procedure.
The work investigated the effects of the. designing parameters which are engine speed, static spark timing, spark plug gap, contact breaker points gap, and valve tappet clearance on emission, noise level, and vibration emitted from the
engme.
from the results of the work, it has been observed that using compressed natural gas instead of gasoline comparatively decreases the emitted carbon monoxide and hydrocarbon emissions in particular besides noise level and vibration caused by engine running. By this we can declare that compressed natural gas is a friend of nature, in view of its role in minimizing air pollution which has become the most warring problem in the present time.
Moreover, there are certain recommendations conceming the engine fuelled by compressed natural gas which is meant to receive less emissions, noise level and vibration. Finally, comments and recommendations for future work are given for extending the study circle about the subject matter.