Evaluation of combustion parameters such as ignition delay and combust
ion duration to study the performance of the reciprocating engines is
very important. So far there is no clear-cut method available for the
evaluation of these parameters. In this paper the available methods ha
ve been reviewed and a new approach has been suggested for the determi
nation of the ignition delay and combustion duration based on the expe
rimental study on a four-stroke S. I. engine using alcohol as fuel.