Here are some of the latest 3D's showing how the float
bowl moves up and down a half inch to lean the mixture.
The scale on this DWG is more accurate as I found
my Holley 4 barrel to measure.
BTW if you apply dynamic pressure to the float bowl
the delivered mixture will be a function of both vacuum
in the venturi throat plus the square law dynamic pressure
In other words the dynamic pressure in the
intake runners will be the square of the air velocity.
At full chat that can be as high as 300 MPH.
Sort of a mini pito tube in the intake runner.
I am not sure this is what you want but it can always
be leaned and the bottom line is: the fuel will squirt
out into the intake runner better.
I learned this trick from Ellison.
The more I work on this the better it looks.
You will be up and running in 5 minutes not
one year tuning an EFI in the air.
There are only four cheap parts to make.
The rest of the needed parts are stock Holley.
One can buy a brand new 4 barrel Holley for $250 to scavenge
the parts from. Perhaps someone can find some on ebay.
Paul Lamar
Here is a more compact version that will fit under most
cowls.
Paul Lamar
Paul,
The 2 float bowls could be mounted to a single metering plate cross
drilled with 2 separate outlets. Then only one unit would have to be
raised and lowered. Would this require flex tubing from the bowl
outlets to the venturi tubes? We would have to turn a venturi
into 2 2
inch OD tubes? Just thinking.
Joe Berki
It does require flex tubing. Each float bowl needs to be close
to the jet. Sketch up what you have in mind.
Here are some dwgs for the Marvel Schribler HA-6
Paul Lamar
Paul,
Here is a sketch, I am not sure if there are any other connections
to the system. Please elaborate.
Joe Berki
Limo EZ
Nice sketch Joe but you must draw things to scale. Won't fit. The
float bowl is too long. It must go between the tubes to get the
float level high enough. That is why a 3D program like Rhino is
worth its weight in gold.
Paul Lamar
Joe B. I don't think a single float bowl will work. No matter where
it is located when you rotate for take off or even in a climb the two
intake runners are at a different height due to the engine being tilted
along with the airframe.. This will change the relative height
difference from the level of fuel in the bowl to the jet which as I
understand it is the means of controlling the rich or lean condition of
the charge. With separate float bowls both forward or aft of their
respective intake runner the change would at least be uniform and not
have one ricjh and one lean rotor. It may actually be preferable for
the float bowl to be mounted on the 180 degree bend of the intake runner
in line with the center of the runner and have a steel tube run to the
venturi area on the runner so that mixture won't be affected by the
takeoff rotation.
Anybody remember the Amal "gran prix" carburetors used on BSA and
Norton motorcycles with a common remote float bowl and external metering
rods? Combined with the Lucas magneto ignition it made for a very safe
motorcycle because it stayed in the barn from reliability issues.
George grimes
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