12 c
I woke up with an idea. No mass air flow sensor. No maximite
required. Use a potentiometer that is geared to the throttle with a
small cog belts. Put 5 volts on top of the pot.

Or you can use a leaner pot with a slide throttle.

5 volts wide open zero volts closed.

http://www.sdp-si.com/products/miniature-products/miniature-belts-and-pulleys-inch.php

 Then use my one chip $1 555  EFI.

Super low cost super simple TLC 555 based electronic fuel injection.


<http://www.rotaryeng.net/simple-cheap-555.html

You can use a low cost Harbor Freight Voltmeter to monitor the pot
voltage..

There is no system EFI or carb that is lower cost.

Paul Lamar


Paul,

That is a throttle position sensor TPS

Why not put a pot in the cockpit at the rotation pivot of the
throttle lever?

Kinder environment



Joe Berki

Paul,

Jst  a thought about eliminating the MAF.

Do we lose altitude compensation?

Joe Berki

Yes. But when you take off at a high altitude airport with a carb
equipped engine you must adjust the mixture anyway.

The mixture pot can increase or decrease the voltage applied to the
pot connected to the throttle and then the  555 at any throttle
setting.

This is a quick, dirty and low cost  EFI way of getting your engine
running. You fine tune it with the mixture control just like you do
any carb equipped aircraft engine.

Paul Lamar


My Continental IO-360s have mechanical FIs that simply meter fuel into a common injection spyder based on throttle position. This fuel is then equally  divided (based on pressure) to individual fuel injector/vaporizers located in each intake manifold.  (GAMI injectors are tuned per cylinder).  Fuel flow is further moderated by the manual mixture control, which is used to lean for cruise, high altitude, and to shut down the engine.  Simple and reliable.

It would seem that Paul’s 555 system triggering off of CAS (using RPM as a proxy for power and fuel requirements), moderated by a manual mixture control, might well be the simplest solution for our EFI?

BTW, considering the space restraints, potential damage by a broken belt, and mounting considerations of front sensors, might it be more practical to mount Hall effect sensors on the redrive adapter plate and have a magnet strategically located on the flex plate instead?

If we will be using Maximites to control the ignition, the current $56 color Maximites have an empty breadboard area that could also house the 555 EFI circuitry.

Scott Gettings


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