[Diy_efi] timeframe to get equal fuel distribution

[gngrbrd_man]

I think what may be being missed here is that the fuel injector can be
placed in the cylinder wall, below the ring level during
compression/ignition/early burn, so that it is only exposed to the cylinder
pressure when the piston is far enough down that the exhaust port is
uncovered, meaning that the gases the injector might be exposed to would
already be expanding and cooling as they rushed out the exhaust port.
However the lower the injector is placed, the less time there is to inject,
so this also is a tradeoff.
Come to think of it, this just made me think of a rotary.  It may be
possible to do direct injection into the moving 'chamber' in such a way that
the trailing seal moves past the injector just before the leading seal
passes the plug, giving "direct injection" into the compressing gases, long
after the exhaust port is closed, but not into the combustion chamber.
Viola, no fuel blowthrough, even with long port overlap, but less complexity
than true DGI. ;)
Keith

You know you've achieved perfection in design,
not when you have nothing more to add,
but when you have nothing more to take away.
-- Antoine de Saint Exupery


----- Original Message -----
From: "Adam Wade" <espresso_doppio at yahoo.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Saturday, March 15, 2003 11:26 PM
Subject: RE: [Diy_efi] timeframe to get equal fuel distribution


| --- joeld <joeld at ualberta.ca> wrote:
|
| > These injectors have been designed for this
| > application. They will not melt.
|
| Okay, so they are the "stock" GDI injectors, then?
|
| What method of stratified charge are they using?  If
| it is a two-stroke and based on the Orbital design, I
| believe they are using a spray-guided philosophy,
| which would seem to require that you move the pocket
| in the head/piston along with the spark plug if you
| move the injector...
|
| Where did the system come from that you are using?
|
| > They will not have to endure high pressures at all.
| > 2 stroke pressure is entirely different from 4
| > stroke.
|
| Well, combustion pressure is combustion pressure.  I
| don't think it matters how many cycles the engine
| uses, when you light off the mixture, a peak pressure
| is reached.  :D
|
| > If the injectors are placed correctly, they
| > can easilly be held in by the fuel rail only
|
| I guess maybe I'm not understanding what you are
| trying to do.  GDI, correct?  Injector within the
| limits of the combustion chamber at TDC?  Or within
| one of the ports in the cylinder?  Or inside a pocket
| in the cylinder head behind a rotary valve?
|
| > We have looked extensively into all the DI systems,
| > more than the average person has access to. With our
| > budjet, none are feasable to be adapted to other
| > engines.
|
| Heck, I don't think any can be adapted to most
| engines.  You have to adapt the engine and they system
| around each other, to some degree, by my
| understanding.  You can't just modify a GDI system to
| work on a particular engine.
|
| > This will work and has been done before, I just
| > wanted some creative input
|
| I guess if *I* am to be of any real help, I need more
| details.  I'm not even sure what it is specifically
| that you are asking.
|
| =====
| | Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
| |   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| | "It was like an emergency ward after a great catastrophe; it  |
| |   didn't matter what race or class the victims belonged to.   |
| |  They were all given the same miracle drug, which was coffee. |
| |   The catastrophe in this case, of course, was that the sun   |
| |     had come up again."                    -Kurt Vonnegut     |
|
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