I am really impressed by your web-page on 555-based EFI systems for aircraft
engines.
Mazda rotary engines have always been of interest, especially in 200+ hp
airplanes.
However, my main interest for now is obtaining simple EFI systems for my two
experimental motorglider projects, which have 16 & 42 hp piston engines.

The 16 hp project is a highly modified a Moni motorglider with new landing
gear, composite wing span extensions & Y-tail, and a 4-stroke engine.
The engine I have selected is the Teledyne-Continental 4A032, a flat-4
military engine made for ground-based power units, 8 cu.in. displacement per
cylinder, for a total of 32 cid.
The stock engine has electronic ignition and an undersized float-type
carburetor, but the carburetor is inadequate for aircraft use, so that sent
me searching for a simple EFI solution.


Such small cylinders could necessitate using a single throttle body
injector, but some very small motorcycle engine injectors are now being made
that may allow multi-point injection.
The clever way you have integrated the mass flow sensor and lean control
into the timer IC is a really ingenious way to control the engine.
I was thinking that the 555-based system you decribed could be modified to
eliminate the separate shaft trigger by using the ignition spark from one of
the cylinders, since that is already a pulse trigger coming from the
internal shaft position sensor.
In any case, I was hoping that you might have components available that
could be used to speed the development of a simple EFI system for this
engine.

My other motorglider project is my own two-seat design for which I have
selected a very similar military surplus engine, the 4A084, which is a
flat-4 with 84 cid.
It would be ideal to use same basic EFI system developed for the 32 cid
engine on this larger 84 cid engine.
By the way, several 4A084 engines with conventional EFI systems are flying
today, though these are much more expensive and complicated computer-based
EFI systems.
Les Smoot has a couple of them flying on his J-3 Kitten LSAs... see the
Yahoo "Surplus Engines" group for more info.
The potential market for an EFI system for the 84cid engine is much larger
than for the 32cid.

If you have any 555-based EFI kits, components, plans, etc. that I could
purchase, please send me any information you may have available.
I don't want to bother you with a lot of calls & questions, and don't expect
anything for free.
Thank you for your time, and please keep up the good work!
Happy Thanksgiving.


Sincerely,
-
Daniel J. Moser, President/CTO
Compositex, Inc.

I moved away from the mass air flow sensor as one, it is non linear and two, it is more expensive than a FreeScale zero to 5 volt pressure sensor.
Everything else works pretty much the same. I just have not updated the web site yet.

I have not had the new pc boards made but you are welcomes to copy this design.

Paul Lamar

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