<< Fred Osborn wrote:
 >
 > Lynn,
 >
 > Love your rants, very educational.
 >
 > Big Snip
 >
 > "could we let go of the carburetor and try high pressure direct

injection?

 > Like every damn diesel in the world. If you can't design one

yourself,

 > steal
 > one off of a VW."
 >
 > I certainly know I can't design one. Do you have any recommendation

as to

 > which VW system would be a good place to start stealing? I would

really

 > like to try this in a single rotor test bed.
 >
 > Fred O.

I have seen them on running engines in the VW pickup truck. There are a

lot

of things that you could have with the addition of high pressure direct
injection. John Deer built a prechamber to inject into for their diesel

fueled

generator set rotary. The same could be used for a spark ingnition

engine, so that

the engine would run on any flamable liquid but not require the high
compression of a diesel. Similar to the Honda 1200CC three valve. Where

a small valve

let in an over rich easy to light mixture reight beside the spark plug,

to

light a very over lean mixture entering through a normal sized valve.

I have thought about this for years. There would be a loss of apex seal
lubrication if you inject very far into the compression stroke, so

direct injection

of lube like the newer engines might be required. Lots of good things

about

high pressure direct injection. The VW pump (Bosch) is big and very

heavy. But

you only need one piece of the injection pump element. So there could be

a

saving there. Also you might find a damaged pump that has enough parts

to build a

single section pump.

With a single rotor, you could build a plunger holder and just run it

off of

an eccentric ring right on the crank. Maybe get the whole thing inside

the

front cover. Once it gets hot it would run on anything.

See the direct injection pump on this design.

Lynn E. Hanover

I can't say much for the engine design but the direct injector set up is

called a

Bosch Unit Injector. Off the shelf.  Same as used on this German Wankel

GMBH engine.

Paul Lamar

IMHO there is very little advantage, and numerous disadvantages to high
pressure direct fuel injection for aircraft application. Port timed
injection
on the other hand is easier to implement, and generally allows higher
power output because of better mixing and vaporization as compared
to TDI. TDI lends itself to stratified charge (deliberate poor mixing)
that can allow alternate fuel operation and lean burning, but those are
of little value for our operating regime. In Europe there is an unatural
price advantage to the alternate fuels from selective taxation, but
in the US this is not generally the case. Creative innovation will
have a higher payoff in other portions of the system.
The same things go for compression ignition (erroneously
called Diesel ) engines.
Vance

 
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