Possible Mechanisms by which Combustion-Chamber Deposits Accumulate and Influence Knock

descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 01 Jan 1951Publisher:SAE InternationalJournal:SAE Technical Paper Series, volume 1 (issn: 0148-7191, eissn: 2688-3627,

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Authors: L.F. Dumont;

doi: 10.4271/510209

Possible Mechanisms by which Combustion-Chamber Deposits Accumulate and Influence Knock

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Abstract

<div class="section abstract"><div class="htmlview paragraph">THREE mechanisms by which combustion-chamber deposits might increase the octane requirement of an engine are discussed in this paper. These are volume, catalysis, thermal insulation.</div><div class="htmlview paragraph">The experiments reported here indicate that the increase in compression ratio caused by deposit volume accounts, for 20-40% of the octane requirement increase, catalysis may not be a contributing factor, and the thermal insulating effect of the deposits is one of the major causes of deposit knocking harm.</div></div>

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