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Oil injector Pump Adapters

All adapter configurations are in stock. 

  Call Dominic /Laura 615-471-1258 to order by phone. 

Shipping for adapters is $15 US /$35.77 international. 

            Florida residents add 7% sales tax / * Renesis ADJUSTER ships FREE when purchased with the adapter. 

Oil Metering Pump Adapters for Wankel Engine

Wankel engines, such as the one used in the MAZDA RX-7 and RX-8 sports cars, need oil in the

combustion area for lubricating the metal seals.

Most stock engines use a metering pump to supply a small amount of engine oil from the oil

pan into the intake manifold and/or directly into the combustion chamber. Engine oil is

designed to lubricate sleeve bearings and carry heat from the engine interior to some

cooling areas. In the Mazda rotary engine,  the heat is removed from the oil in an oil cooler. When engine oil is introduced into the combustion chamber, it only is burning partially, leaving some unburned deposits behind. These deposits can build up and reduce engine performance.

One obvious method to prevent this, is to disconnect the metering pump altogether and

mix two-stroke oil to the gasoline (as some older two-stroke engines require). With this

method, it has been demonstrated that two-stroke oil is an effective lubricant and there is no

build up of combustion residue. 

The Oil Metering Pump (OMP) Adapter, manufactured  by Richard Sohn, takes the solution one step further by allowing the use of  the stock metering pump, but supplying  it with two-stroke oil.

With the Adapter installed, all that is needed is a small oil tank with two-stroke oil,

connected to the Metering Pump Adapter. The oil level in the tank should never be less

then 6” above metering pump. Oil consumption is approximately 1/100 of fuel used.

Renesis OMP Adjuster

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 RX-8 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.

Solution.

Picture 1

The RX-8 OMP is equipped with a position sensor, (Picture  1), which monitors the position of

the control shaft on the pump. This position sensor may be replaced with an adjuster

(Picture 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.

Picture 2

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