Some Insights on Mechanisms of Oil Consumption

Abstract

<div class="htmlview paragraph">The present paper describes some experiments aiming to point out the link between oil consumption and reverse blowby.</div> <div class="htmlview paragraph">Some tests have been carried out on a motored single cylinder diesel engine. The reverse blowby gas mass flow has been evaluated by a thermodynamical model that utilizes both the measured combustion and second land pressures, and the blowby gas mass flow.</div> <div class="htmlview paragraph">Oil consumption has been measured in real time using a CO<sub>2</sub>-tracer method, whereas the blowby has been measured by a fast response orifice meter. The first ring lifting has also been recorded.</div> <div class="htmlview paragraph">It has been observed that, under certain engine operating conditions, both blowby and oil consumption assume quite constant levels.</div> <div class="htmlview paragraph">On the contrary, under other operating conditions, they vary in a cyclical way. However, in both cases, a relationship between blowby, reverse blowby and oil consumption can be recognized.</div> <div class="htmlview paragraph">The results obtained in the present research lead us to conclude that reverse blowby is one of the most significant causes of oil transport into the combustion chamber.</div>