Got the PC boards from PCB express today.
By ganging them together I got the price down to
$8 per PCB. You need one per injector.

I'll have one soldered today. Got to go to the hangar
and cut them apart with the band saw.

This will be way cheaper than a typical
computer EFI system. Way cheaper even than
an aircraft carb.

Paul Lamar

This is it. A complete EFI system except for the crank trigger,
injector and mass air flow sensor. One rotor or one cylinder engine one injector. I like that cute little heat sink for the injector driver
transistor.


Well not quite. The crank trigger pulse will need a bit of cleaning
up and the mass airflow sensor needs a bit of scaling with a op amp
but essentially that is it. There will be leaning pot or two on the
instrument panel. Of course if you want two injectors per rotor you
will need two of these. Four injectors four but they are going to be
cheap and they will plug into a common mother board.

Each of these units has its own power supply so if one part in
the power supply fails the entire EFI system won't go down.
With two triggers for a two rotor each trigger will have a
separate power supply.

Next step is finding a cheap crank angle sensor.

Here is what I have. I think they are Denso cam angle sensors.
Might work. Anybody have spare crank angle sensors for cheap economy
cars lying around and you can spare them I can use them for testing.

The hole in the hole saw will simulate a crank trigger wheel
when rotating.

Paul Lamar



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