Oil Metering Pump

Last updated: June 29, 2000

Date: Wed, 29 Mar 2000 00:29:25 -0800
From: "Les D" (les_d@my-deja.com)

Trick question:

Do you know what ratio the FD mixes oil at with its metering pump?

Answer: Well, that depends on what load the car is under. The ratio is probably around 40:1 when the load is high, to help protect the engine. The metering pump is run by the ecu, utilizing a stepper motor to adjust pump flow. The engine still drives the pump.



>If you use a standalone computer system how do you control the oil
>injection system??


Several people suggested just pre-mixing the oil with the gas (in the gas tank), which some people do for extra protection anyway.

There should be some info on nthe proper ratio on the Oil page on this site.

Mechanical Conversion

Date: Fri, 13 Aug 1999 08:10:18 +1000
From: smitha@au1.ibm.com

You can do what everyone over here does and swap the timing cover for the older model 13B and therefore convert the oil metering pump back to mechanical. Then run any computer you want, and not have the issue of worrying about oil in the fuel.


Date: Tue, 11 Apr 2000 08:33:05 -0500
From: "Westbrook, Chuck E." (CWestbrook@tmh.tmc.edu)

> There is a hose coming off the top of each rotor housing.  What are
> these for (it appears they connect to the primary intake elbow for vacuum)?
> Do I need to cap them if I'm not using them?  And what are those two very
> thin clearish plastic tubes that attach to the same spot (it appears there
> may be gasoline in them?)

Those two plastic lines are your oil injector lines from the MOP(metering oil pump). They supply the oil to lubricate the apex and side seals of the rotors. The two vacuum hoses are connected to the #1 turbo inlet and two control valves. One valve for each oil line. These valves prevent the oil from leaking into the rotor chambers when the engine is not running.

Metering Pump Adapter

Date: Fri, 30 Jun 2000 10:05:04 -0500
From: David Bennett (rx7x2@home.com)

Richard Sohn wrote:

Requested Metering Pump Adapter information


Metering Pump Adapter for Wankel Engine.


Adapter Assembly	1
Bolt			2
O-Ring			2


Wankel engines such as the one used in the MAZDA RX7 sports car need oil in the combustion area for lubricating the metal seals.

Most stock engines use a metering pump pumping 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 RX7 the heat is removed from the oil in an oil cooler. When engine oil is getting 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 of preventing this is to disconnect the metering pump altogether and mix two-stroke oil to the gasoline like 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 residues.

The Metering Pump Adapter, as offered by PCV Technologies takes the solution one step further in allowing to still useing the stock metering pump but supply 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.


Price: US$ 144.00 payable in check or money order to:

Richard Sohn
8029 HWY 1087
DeFuniak Springs, FL 32433


A few adapters for 13B gen2 are available now, next availability in 2 to 3 weeks.

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Stock Computer Control

Some people retain the stock computer to do other functions, e.g.- air conditioning control, etc. This may also apply to the oil metering pump.

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