The Effects of Fuel Composition and Fuel Additives on Intake System Detergency of Japanese Automobile Engine

Abstract

<div class="htmlview paragraph">The effects of fuel composition and additives (antioxidant and detergent) on intake system cleanliness have been studied using Japanese automobile engines equipped with EGR systems. The following conclusions were obtained.</div> <div class="htmlview paragraph">Cleanliness of the intake system (carburetor and intake manifold) is influenced remarkably by the fuel characteristics, namely the olefin content and the type of antioxidant.</div> <div class="htmlview paragraph">The detergent gives a large improvement in the cleanliness of carburetors and intake manifolds, but shows little or no effect on the intake valves.</div> <div class="htmlview paragraph">A carrier oil used together with the detergent does reduce the deposit formation especially on the intake valves.</div> <div class="htmlview paragraph">The increase of the aromatic content appears to augment the deposits on the cylinder head.</div>