<< You may want to try to get a hold of Gary at TWM. He really knows his
stuff.
 > Bought a 3003 with single injectors for my 20bt.  It may not idle the
 > greatest, but really simplifies many other things.  They have LARGE,
 > EXPENSIVE  injectors that go up to about 125 per rotor if you want. The
 > output of the large injectors are definitely interesting.
 > http://www.twminduction.com/
 >
 > Barny
 > MGDQ 20bt

I am completely out of my element  here, but I think the low pressure
K-jettronic copies have very low or no pop pressure at all. They just open
electrically and spray into a low pressure inlet tract.

High pressure mechanical systems can have pop pressures rated in thousands of
pounds. They have to inject into 24:1 compression ratio diesel combustion
chambers, and the fuel delivery performs the function of a spark plug. The heat
of compression is so high that the fuel begins to burn as it is sprayed into
the chamber. So the timing is just BTDC and the entire fuel for that cycle is
delivered in a few degrees of rotation. There is no throttle butterfly at all.
The intake is allways wide open and RPM is controled by fuel quantity being
injected.

Over boosted diesels cannot detonate because there is no fuel available until
the injector fires. Also, the pop pressure can be adjusted to refine the
atomization to a near plazma state. The gasoline going through the injector would
be heated to the extent that it would ignite without the spark plug, even
without the super high compression ratio of the diesel. You could turbo it without
a waste gate. Nothing to burn in the chamber so no detonation. The bearing
loads would be far less than a diesel. The pop pressure is the pressure it takes
to unseat a needle valve inside the injector. It can be 500 PSI or 1,000 PSI,
depending on the spring inside the injector.

A complete dyno room, a supply of engines, a complete machine shop, a small
staff and $100,000.00 and we could have some answers. If we had some contacts
at Mazda, they have probably done this allready. Everyone was working on this
kind of thing during the "Fuel Crissis" in the 70s.

Lynn E. Hanover

As Vance said it has been done. There are half a dozen SAE papers on direct
injection stratified charge rotary engines.  There is little or no BSFC advantage
at full or cruise power levels. Just a lot of expense. In effect the RX8 engine,
with the side exhaust port, pretty well achieves the same thing as stratified
charge by recycling unburned fuel.

Paul Lamar

If I had $100,000 for rotary R&D I would focus on reducing the weight.
Probably two piece end housings with steel wear surfaces.

Paul Lamar
 
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