marc wrote:

Someone ask Richard Sohn. He should know.

Marc Wiese

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

Totally incorrect. The mikuni pump is positive displacement. a

piston with

check valves. The guy is altering the facts to suit his preconceived
preferences.

Bill Jepson

     My guess there is not enough air pressure to force the
     oil through the orifice.

     Paul Lamar

     George Lendich wrote:
     >
     > Paul/Dave,
     > Why is that so!?
     > George (down under)

 
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