For REALLY good injection, check this out

[jb24 at chrysler.com]

>>Orbital engine from Australia has been experimenting with this for
several years for 2-stroke engines.  As I understand it the proper
amount of fuel is blown into the  combustion chamber with ~100 psi air.
A small belt driven compressor supplies the air.  The idea is to get
good atomization and allow injection after the exhaust port has been
covered (preventing raw fuel from going out the exhaust).  They have
licensed the technology to GM, Ford, Toyota and others.  So far nothing
meeting NOx has been a problem so no marketable engine has come out.
<<

The only problem with Orbital's engine (and all other automotive
two-strokes so far) is while raw fuel doesn't escape down the exhaust
port, unburned oxygen does.  So the O2 sensor sees a lean mixture (not
a big problem in itself, what mapping is all about) but so to does the
catalyst.  Catalysts are designed for stoic, so the catalyst-out
emissions aren't as good as four-strokes, even though engine-out
emissions are much lower.  If the catalyst industry figures out how to
make lean-burn catalysts, many many two-strokes will be on the road.

John Bucknell