Nice summary. A couple of corrections. You don't need a mass air flow sensor
with the PICAXE as you can use the same solid state manifold pressure sensor Tracy
uses. The PICAXE is so cheap ten can be bought for the price of Tracy's system.
However it requires a bit of computer expertise to use them. Same goes for
the Megasquirt but it is a bit more overkill and a lot more expensive than
the PICAXE.

I am not really serious about the dual carb system using the slide throttle and needle
valves. It would require a total redesign and much R&D. On that we agree.

Changing Doc's oblong slide for a round hole slide with the ramp system
is my leading choice. That was the very first idea way back when. That combined
with some sort of adjustable fuel pressure regulator is super simple and no
functionally different than  dual Mikuni 48 mm. It uses regulated low pressure
instead of vacuum to inject the fuel. I will probably test it on the RX8 p-port
engine.

Forget smaller carbs. If you are going to go to the trouble of building a p-port why
shoot your self in the foot by going to smaller carbs to save a few bucks. I don't
recommend any carb shy of 48 mm as you will take a big HP hit. See the enclosed
dyno chart for both the Power Sport p-port engine with 1 3/4 inch dia. 28 inch long
runners and the ACRE p-port engine using the 2 inch dia. 28 inch long runners.

Carbs also have the drawback of having to devise a way of leaning them.

The Mikuni 48 mm is also not easy to tune with several jets that must be adjusted
in size. In fact most carbs are over kill as far as the accuracy of the
mixture over a wide range of conditions that are not found in aircraft use.
One example is the accelerator pump. Aircraft engines do not accelerate
at the same rate as car engines due to the rotational inertia of the prop.
Aircraft engines spend the vast majority of the time at WOT with one load.
Starting mixture enrichment can be accommodated by increase the fuel
pressure.

BTW turn the engine over with the starter BEFORE turning
on the electric fuel pump or the engine will flood.

With Teflon O-rings the round hole slide with the ramp system will seal
perfectly however sealing perfectly may not be needed as the only way for
leaking fuel to get out is into the engine. No different than the slide throttle
with electronic fuel injection. Same situation.

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I uploaded a couple of unintended  charts and one unintended 3D on the last go around.
Here are the intended charts and 3D's.

I also don't recommend the 28 inch long runners. The 24.5 inch runners
are better suited to our purpose. Last jpg.


Paul Lamar ...No rotor no motor.

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