> I have decided to make a simple carb for those people that
> don't want to deal with EFI. It is a real shame that one needs
> a degree in electrical engineering to tune and install current EFI  > products.
> Anybody can understand a carb. The leaning system uses an eccentric  > shaft
> just like the rotary to change the float level. Super simple.
>
> I stole an idea from Weber carbs. There will be two small venturis
> that do the fuel metering. Can't beat a simple system like that.
> Internal fuel passages are not shown yet for the most part.
>
> Hopefully Larry will build it and sell it. I am sure he will have
> a lot of suggestions for improvements.
>
> This carb works with Doc's slide throttle as is. It is merely bolted
> to the side of the slide throttle.
>
> This is a low technical risk solution. Guaranteed to work right
> out of the box. No innovation here.
>
> Paul Lamar ...No rotor no motor.

Excellent idea.  Add a simple crank trigger ignition.   Forget the
computer.     Jerry

It is  too late for me, but I like it.
Buly

Your decision has convinced me it is the way to go.

Here is what the outside looks like. Hey you should have asked me for help
on the wiring. I would have made you a whole new wiring harness for free
and flown down there and installed it for you :)

 > Paul Lamar


Paul,
Why not copy a Tillotsen diaphragm carb from the old days of go-kart
racing.  Then you would not have the bowl full of fuel and the delicate
float mechanism to worry about.  Your mixture cam could bear on a spring
against the diaphragm.  Using the diaphragm as a regulator, I think you
could meter fuel directly into the slide throttle.  Think about the
Bendix pressure injection carbs.

Aubrey Thompson

That is an interesting idea Aubrey. Thanks for the tip. I am looking into it.
Here is a very good site on the subject.
http://www.aerocorsair.com/id27.htm

Paul,
Here is a diagram of the fuel flow through the small, HU series carb
that does not have the fuel pump diaphragm.

Aubrey Thompson

Yes that is a much better illustration of how it works. It is also a good
illustration of why you don't want butterfly valves in an aircraft engine
that runs wide open throttle 99% of the time.   

I wonder if that simple main adjustment needle valve will do the job of leaning.
I suspect the other needle is an idle mixture adjustment. Probably not needed
in a rotary that idles at 2000 RPM.

Thanks for suggesting this Aubrey. I am liking it more and more.
Super simple and super compact.

Paul Lamar ...No rotor no motor.

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