Idling Knock in a Pre-Combustion Type Diesel Engine

Abstract

The idling knock of a pre-combustion type Diesel engine is considered as one of the obstacles to its automotive use, especially, to a passenger car. The mechanism of the idling knock was investigated by observing the effects of various running conditions on the knock. The idling knock was found to be originated from a rapid pressure rise in the cylinder, which was caused by explosive combustion of fuel escaping from the pre-combustion chamber in incompletely mixed state. On the basis of these results, the favourable methods to reduce this knock were worked out.