Paul,

1. I remember a chain about the efi unit that would require a single
"computer" per injector and per coil. Do you have a schematic for it? I
remember you referencing an 8051 chip, and a MOSFET I think.

2. Why do you not use the OEM crank angle sensor that goes in the front
cover? It looks like it is just 2 hall effect sensors. One pickup has 2
points, the lower has 12.

I want to make a unit that I can bench test my coils and injectors before I
stick them in the engine, and maybe use it to fire the engine off and put
some time on it as I build the plane out.

Also, I have several prototype boards that I can program to operate the
coils, injectors, etc. but I was hoping not to have to re-invent the wheel
if I didn't need to.

Kevin Alderman

Yes that is fairly easy to do if you are willing to learn 8051 asm language.
The stock sensors are magnetic and they work fine. A coil wound around a magnet.
I would use multiple hall effect sensors to reduce and simplify the software.
Similar to what Light Speed Engineering is doing with their ignition system.
http://www.rotaryeng.net/simple-cheap-555.html


Right now I am fooling with a cheap PC miniATX mother board.
They are ten times more powerful than the single chip computers and the cost is about
$80. Running DOS they can be programed in easy to learn quick basic.
http://www.rotaryeng.net/fuel-injection.html

Everything, including a full blown EFI, can be written in hours using simple
to learn Quick BASIC. I already wrote a GPS driven moving map program in the early
90's in QB. People will be able read the source code and almost anybody can change
it. Quick BASIC is a compiled language and the programs are small and lightening fast
in modern mother boards.  QB/DOS can handle real time hard ware interrupts which were
used in my moving map program.  The code is already written to read a USB GPS using
the RS232.

It is the combination of DOS, Quick Basic and modern mother boards that will make it
happen. All allow direct connection with the hardware to be controlled.  Quick Basic
has hardware interrupt handling built in. We are looking at over 100 hardware
interrupts in one second. See my attached IEEE paper for more info on hardware
interrupts.

What I and several others are trying to do is add USB support to DOS.
I am getting close. If I can get that to work it is a whole new paradigm in easy to
program hardware controllers.

However I would not wait for it as it might not happen. It makes no sense without DOS
USB support.

Paul Lamar
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