Management of Low Speed Pre-Ignition via Fuel and Lubricant Formulation

Authors

Dr. Ben Leach, Dr. Andrew Smith, Dr. Richard Pearson, Dr. John Williams, Dr. Rebecca Yates, Dr. Craig Ritchie,
BP International Ltd., Reading;
Dr. Adam Weall, Dr. Cao Li, Brian Cooper,
Jaguar Land Rover Ltd., Coventry

Summary

Engine downsizing is a key approach employed by many vehicle manufacturers to improve engine efficiency. These engines can experience potentially destructive abnormal combustion events such as low speed pre-ignition (LSPI). In this work the role of major lubricant components were investigated with regard to LSPI. It was
found that calcium-based detergents have a strong negative impact on LSPI while magnesium-based detergents were neutral. In addition molybdenum dithiocarbamate (Mo-DTC) was found to reduce LSPI propensity where as oil aging strongly increased
LSPI frequency. The impact of fuel properties was also studied. It was found that LSPI frequency was strongly affected by the volatility on the fuel, while RON was more strongly linked to LSPI severity.

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