Well then if you blow into just the oil supply it must have two
check valves in there. I have some up at the hangar. I will cut one
apart and see what is going on.

Paul Lamar

Hans Conser wrote:

No, only comes out the oil end.  I think I just realized what Atkins
may be referring to, the air connection I believe prevents oil from
moving through when there is a vacuum, maybe he thinks that at some
altitude that it acts like a vacuum and shuts off the air flow.

Hans

Does it come out of the air supply line as well or are there two one
way valves in there?

Paul Lamar

Hans Conser wrote:

There is  a check valve built into the injectors themselves.  You can
clean them by blowing air from the oil line attachment side, but it
wont go the other way.

Hans

I am pretty sure it is not there Bill. The shop manual says nothing
about checking it.

Paul Lamar

Paul,
If you check the Oil Feed Line at the banjo fitting I am almost
certain that you will find a small check valve. It has a very low
break-away pressure of about
2-3psi. This was used in all the motorcycles very effectivly. It
would also prevent the chamber pressure from backing the line up.
The
check valve doesn't
have to be built into the pump itself. This system was used in
piston
engines in the intake tract so it had to deal with pressure
reversals
there too.
Bill Jepson

Al Gietzen wrote:

OK; I have studied the diagram of the metering pump, and I'm
pretty

sure I

understand how it works.  It meters and pumps; it is essentially a

positive

displacement pump.  The pumping results from the vertical motion
of

the

shaft.  No check valves necessary because the inlet port is closed
by

the

shaft as the shaft drops and forces oil out the outlet.  New oil
is

drawn in

as the shaft rises while the outlet port is closed.

The flow adjustment lever determines the amount of up and down
travel

of the

shaft by varying the space between the stop pin and the adjusting
pin,

which

determines the vertical movement driven by the wobble plate.
Rather

clever,

really.

My conclusion is that it is altitude independent.

Al

No check valves Bill. It is a piston ported pump something like
the

old

Bristol sleeve valve radial engines. I still think it is
possible. Also most the more recent engines had some sort of air
pressure assist on the apex seal oil nozzles.

Paul Lamar

 
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