Jim Brewer wrote:

Was said: The first gen 12A engine was not air assisted, used two
lines and injected oil into the float bowl.

How was this accomplished?  Could it be adapted to 2nd and 3rd gen
engines to mix 2 cycle oil into the fuel?

Jim Brewer

Brett & Tiana Campbell wrote:

Good question. My 12A-powered 1st gen is equipped with Richard Sohn's
adapter feeding 2-cycle oil from a reservior, but those cars are

carburated.

The oil is fed into the carburator float bowls where it mixes with the

fuel.

With fuel-injected 13B engines, the only thing I can think of that would

mix

the oil with the fuel prior to entering the combustion chambers is to
install some sort of in-line mixing chamber in the incoming fuel line.
Doesn't sound like it would be too difficult. Of course, for aircraft use
you'd want to use steel fuel or brake lines (or something else more

durable

than the stock nylon metering lines) to feed the oil from the pump to the
mixing chamber. Has anyone tried this yet?

**************************************************************************
The problem is the metering pump works at atmospheric pressure while
the EFI system is at least 40 psi.

Paul Lamar

Brett & Tiana Campbell wrote:

Yeah, never thought of that. The pressurized fuel would just enter the
metering lines and force the oil back. Could this problem be overcome by
fabricating an actual in-line float bowl-type unit complete with needle
valve assembly to regulate the level of fuel while at the same time
de-pressurizing the fuel (as is the case in a carb) so that the oil could be
metered into it? The float bowl could then gravity feed the fuel to a
separate reservior that feeds to an additional fuel pump which supplies the
fuel injectors.

Of course, now things are getting complicated. The float bowl contraption
could be butchered from an old carb, but how much firewall forward weight
would this add and how badly do you want to avoid pre-mixing while retaining
fuel injection?

The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.