David Carter wrote:

I, too, want an external tank of apex seal oil.

I've looked at the Haynes manual photos of the oil injection "pump" and
drawings of oil passages in "block".  Looks to me like the engine oil
pump pressurizes all the oil passages, one of which goes to the "oil
injection pump".  I infer that the "oil injection pump" is not a pump -
rather it is a "metering device" that meters engine oil at current
engine oil pressure.  Thus, to run an external tank, one would need to
separate the "oil metering device/injection pump", install brass plug in
engine caseand in corresponding hole in injection pump; then, drill a
new oil passage from the top of the injection pump body into the
existing oil passage, tap it, and install the line from an external tank
at that new hole.

Then we are faced with getting 75psi oil from the external tank to the
new hole in the injector pump.  The first solution that comes to mind is
an external tank like a jet aircraft hydraulic accumulator - i.e., with
a rubber diaphragm separating the inner chamber in half - with oil
reservoir on one side, with outlet to injection pump/metering device;
and other side being plumbed to a source of engine oil at its 75psi
pressure, say from a T fitting at the oil cooler or oil filter body.
The diaphragm prevents mixing of the two type of oil and transmits
engine oil pressure to the two stroke oil (Marvel Mystery oil, per Tracy
Crook) and the system should work just like a stock system.

David Carter

I would forego the Marvel Mystery Oil until Tracy has a chance
to inspect the inside of his engine :-) It came out near the bottom
of the list in the oil bake test :-)

I built a small gear pump out of pinion gear stock
from Boston Gear. I will get it from the hangar and take 
a picture in a couple of days. I will also make a drawing. 
It is pretty easy to do if you immerse it in the tip seal lube 
reservoir as you will only need one shaft seal.

Paul Lamar
 
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