PR-179-13201-R01 Cylinder Wall Lubrication for Power Cylinder Timed Lube Oil Injection

A retrofit lube oil injection system is designed with the capability of injecting oil through two lube ports on each cylinder at any time during the engine cycle. The system is installed and tested on a Cooper-Bessemer GMV4 engine. Variations in number of skip cycles, average lube rate, and injection timing are evaluated. Lube oil carry-over is quantified using a dilution tunnel and a standard particulate matter gravimetric measurement technique. Cylinder wall lubrication is quantified using a custom designed fixture that is inserted into the fuel valve port between data points when the engine is shut down. The best lube oil carry-over results for nominal lube rate are obtained by injecting every fourth cycle and injection timing roughly corresponding to the time the piston rings pass the lube ports during expansion.