As to injection, I've been thinking about some sort of Stratified-Charge
Quasi-Diesel.
I.E., starts with spark plugs, but runs as a straight Diesel once it
gets going. There seem to be several design efforts going this way, but
very quietly !

I think the key is to use a Turbo to boost overall compression ratio
into the normal Diesel range, and maintaining the heat generated by the
turbo's 2:1 to 4:1 pressure ratio. Hence no Intercooler and no Throttle.

I.E., recover some exhaust power, muffel the exhaust, eliminate intake
pumping loss, and perhaps even generate a little torque during the
intake cycle.

Assuming lower exhaust temperatures of a diesel, use of best apex seals
and modern coatings, how high can the inlet temperature go ? The great
unknown !

"Thinking Outside the Box"
JCP

Hey, JCP:

I'd love to share some thoughts with you about stratified charge diesel
rotary. The John Deere/NASA studies of the SCORE engine really got me
thinking "outside the box" on the 13B.

What do you think of this proposal?

Take a stock 13B and P-port the intake. With 9:1 compression ratio,
direct inject diesel (JetA) same location as the hydrogen rotary.
Instead of ignition from a spark plug (of course a spark would never
ignite diesel at these low compression ratios) a hydrogen-fed injector
with spark incorporated would be located at the spark plug hole. This
H-injector would send a puff of hydrogen into a small pre-chamber and
ignited by the spark, sending a small flame into the main combustion
chamber to ignite the diesel. The hydrogen would be provided by any one
of the current "Hydrogen on demand" systems in use today. Actually,
just about any fuel could be used in this model since the ignition
source is a flame, not a spark. (Omnivorous fuel?)

What would be the challenges of this type of SCORE development? There
must be something missing otherwise John Deere/NASA would have developed
this by now, you would think? I, for one, believe it has some merit but
I don't fully understand the chemestry/mechanical challenges behind it.

Greg Fleming
London, Ontario, Canada