The present study concerns primarily with combustion analyses under deposited conditions in engine combustion chamber and with the effect of engine deposits on fuel economy using a mini-engine.
The engine deposits in the mini-engine were found to afford a beneficial effect on fuel saving. Energy distributions with and without engine deposits were compared, and it was found that a large cooling energy loss contraction occurred in the deposited engine.
Also observed in the present study was that the combustion rate was greater under deposited conditions. These observations strongly suggest that engine deposits have a potentially beneficial effect for controlling fuel consumption.