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Investigations of Engine Oil Effect on Abnormal Combustion in Turbocharged Direct Injection - Spark Ignition Engines (Second Report)~Correlation Between Auto-Ignition Temperature of Engine Oil and Low-Speed Pre-Ignition Frequency
Published May 23, 2012 by Society of Automotive Engineers of Japan in Japan
Abnormal combustion referred to as Low-Speed Pre-Ignition (LSPI) may restrict low speed torque improvements in turbocharged Direct Injection - Spark Ignition Engines. Recent investigations have reported that the autoignition of an engine oil droplet in the combustion chamber may cause unexpected and random LSPI. This study shows that engine oil formulations have a significant effect on LSPI, and that the spontaneous ignition temperature of engine oil, as determined using High-Pressure Differential Scanning Calorimetry (HP-DSC) correlates well with LSPI frequency.