ADJUSTER FOR THE
The RENESIS engine is becoming increasingly popular for conversion for use in experimental airplanes. Using the Oil Metering Pump for top lubrication is an open question, because most after market EMSs do not provide an output for OMP control.
In the RX8 automobile the OMP oil flow is controlled by engine RPM and pump-rate. The pump-rate control is activated by the engine computer. This pump-rate control is used to increase oil flow when there is an increased power demand at low engine RPM. This condition does generally not occur in an airplane.
When the engine is used with an EMS with no output for the OMP, the only option is to mix some oil in the fuel for top lubrication. The preferred oil used for this method is two-stroke oil for its ability to readily mix with gasoline and lower combustion residues than regular motor oil.
To overcome this draw back in aircraft use, the OMP pump-rate control can be fixed to a certain position, and the oil flow will only change with engine RPM.
The RX8 OMP is equipped with a position sensor, (pic 1.), which monitors the position of the control shaft on the pump. This position sensor may be replaced with an adjuster (pic.2.) to set the control shaft to a fixed position. In this way, the OMP is fully functional, giving an oil amount comparable to oil mixed in the fuel.