I'm replying via a web browser... So if this gets tacked onto the
front of the
message instead of the end, my apologies.
I just pulled the gear and shaft for my oil injection pump, and threaded the
hole of the front cover oil supply gallery to take a 6mm setscrew.
Seated in
the oil gallery just fine, and used a little lock-tite to keep it there.
Now the front cover of my 20B looks just like that of a 13B, and there's no
roll pin in it anywhere... just a hole. Looked to me like that's
where the oil
came out of the metering pump shaft after doing it's job. Guess
I'll have to
go back and look again. At least the plug is reversable!
Tom Kendall
I am not so sure that lubes the chain. It might have that effect but
I think the hole is mainly for the roll pin which I assume keeps the
shaft in place. If it were not for that roll pin the metering pump
gear could become disengaged from its drive gear upon assemble. I
think there is plenty of oil coming out of the front main bearing
and splashing around in there to lube the chain.
Come to think of it I am sure of it as just to the right of
that roll pin is the vent for the oil reservoir for the injection
pump. That is vented to the near atmospheric pressure in the
front cover. Therefor no pressure ... no squirt. We went around
and around about this quite some time ago.
Old message below.
Paul Lamar
***********************************************************************
From: Paul <rotaryeng@earthlink.net>
11/15/2000 22:36
Subject: oil injection pump
Somebody mentioned they thought the oil injection pump was not a pump at all
but just a metering device that relied on engine oil pressure.
Not the case. The oil injection pump is indeed a pump and is gravity
fed with oil at
atmospheric pressure. The pumping action comes from the fact that the plunger
moves up and down in its bore as shown in this drawing from the Mazda book
called "Rotary Engine". The stroke of this up and down motion hence
the amount of
oil injected is controlled by the throttle opening linkage.
The mechanical pump is an off the shelf motor cycle part bought out by Mazda.
As I recall it is made by Mikuni.
Paul Lamar
If this is the case it seams that one could plumb it to feed from a
tank of two cycle oil, has anyone done this before?
Ken
Oh yes. Richard Sohn makes and sells em!
Paul Lamar
Paul
I would like to contact Richard Sohn....do you have contact info?
Fred Vandeman
Requested Metering Pump Adapter information
*****************************************************************
PCV TECHNOLOGIES
USER MANUAL
Metering Pump Adapter for Wankel Engine.
PARTS LIST:
ITEM QUANTITY
Adapter Assembly 1
Bolt 2
O-Ring 2
Description.
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.
________________________________________________________________________
8029 HWY 1087, DeFuniak Springs, FL 32433. Tel/Fax(850)834-4905
email:unicorn@aic-fl.com
Price: US$ 82.00 payable in check or money order to
Richard Sohn
8029 HWY 1087
DeFuniak Springs, FL 32433
*****************************************************
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