I think Jeff (jeff.doddridge@gmail.com) cut these down for Mazdatrix.
It does away with the round oil seals which I suspect we don't need.
The oil seals have unavoidable friction which in theory burns slightly more
fuel.
My guess, based on these enclosed charts, is a 33% reduction in rotary
engine friction. The engine will generate more power at the same RPM as well.
Furthermore the side seals will get more oil for possibly lower side housing
wear.
It also cuts the weight of rotors so the counter weights are slightly
lighter and the load on the rotor bearings is reduced at any given RPM.
My Mazda Cosmo had melted oil seal O-rings and I drove it for years.
It smoked like a radial engine when you started it up but then it stopped
after a few seconds. I never noticed higher oil consumption.
Mazda mentioned this when they were talking about the first rotary engine they
built. It ran fine but they had to add the oil seals to solve the start up smoke
problem.
I think they will work fine in a p-port aircraft or racing car engine.
Sorry about the cell phone pictures. I forget my good camera when I visited
Mazdatrix.
Paul Lamar
Paul,
Best idea I have seen in a while. as long as the side seal gaps are done
very well, this should work fine. I once worked a an engine that a school
had rebuilt and the oil seals were installed upside down. Smoked like a navy
smoke layer.... but the side seal gaps were big as well. I like the increase
in corner seal oiling.... I think I might have to build one of these to
try....
Larry
Great minds.........:)
Paul Lamar
Paul,
for anyone doing this, make sure you radius off all the sharp corners left
by the end mill...... unless you like cracks
Larry
I just had another idea. The amount of oil retained in the rotor after the engine
stops depends of the size of the large oil drain back oil in the center housing. This
oil will leak down and get to the bottom of the engine to create smoke on start.
Making the large drain back hole even larger will reduce the quantity. It will also
cut a bit of weight out of the center housing.
Another possibility is a tiny .032" dia. drain hole drilled in the bottom of the
rotor housings letting the accumulated oil slowly drain back to the oil pan.
This may eliminate the smoke on start up.
Paul Lamar
--
The Rotary Engine News Letter. Powered by Linux.
ACRE NL web site.
http://www.rotaryeng.net
You Tube key word PaulLamar2
Copyright 1998-2012 All world wide rights reserved.
