Power will
    be somewhat down compared to a slide throttle due to the aerodynamic
    drag of the butterflies and throttle shafts. I don't know how much.
    If you
    take out
    the throttle shaft and butterflies and use a slide throttle you will
    lose a lot of functionality like the accelerator pump for one example.

Paul Lamar


I need to say that if you remove the butterflies the Weber simply won't
work at idle. There are small air bleed jets around the butterfly that
force air into the idle circuits. Also the small secondary venturi
couldn't be left out. It is the way the Weber generates enough vacuum to
draw fuel from the float bowl at idle. There are at least 2 sizes of
secondary venturi depending on tuning. Lots of work has gone into this
system to make it work as well as it does. Discard any part of the
system at your peril. I'm not saying there aren't ways to do this
differently, (witness the fact that there are many carb types), I'm just
saying it won't be any easier than getting a EFI to work. Possibly much
more difficult.

The pioneering work on the carbs is there, it has just
already been done for you. I think the slide throttle for the EFI system
is a great idea, which will work after the set up headache has been
handled. After tuning that system it should be very reliable.

Alternately just using a carb off the shelf will probably also work, but
you will spend considerable time jetting it. Mazdatrix might give you a
"starting point" jetting, or they may want you to pay for it. IF SO PAY
THEM! They have already done the heavy lifting. My last race bike had
about 100 hours of jetting to get everything right. It might be said
that an aircraft carb needn't be optimized throughout the entire RPM
range, and that MIGHT be true. Or you could kill yourself when the
engine died at 80 feet when you needed to hammer the throttle in to go
around when an idiot student pulled in front of you on final. I've had
this happen so it isn't a pipe dream scenario. I just want everybody to
understand that a carb isn't a silver bullet solution.
Bill Jepson

It works in 99% of the airplane flying.

Paul Lamar ...No rotor no motor.

"It works in 99% of the airplane flying."
That's catchy Paul, I wonder if you could sell that to Cessna for their
advertising campaigns ?  :)

John Gibbons

Lycoming did some R&D on EFI but did not put it into production.
Here are some of the pictures. They were using many of the automotive parts
we are using. It did not make it to production.

Paul Lamar ...No rotor no motor.

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