I am going to try this on the up coming RX8 P-port engine on
the dyno.
Attached is a chart (DRILL2.TXT) for a linear increase in area
along with the drill diameter necessary to drill that area.
The first column is the area of the hole and the second
column is the drill size.
The idea here as the slides moves more towards WOT
the port area and air flow increase. This requires more
and more fuel. The amount of fuel injected is proportional
to the area of the vertical small hole in the slide.
There fore the fuel holes will get bigger and bigger as
the slide moves more toward WOT. Leaning will
be done by the pressure regulator.
Next step is plot the port opening as a function of slide
travel. Not necessarily linear.
If this works it is a super cheap, low pressure fuel injection.
Very similar to the Ellison throttle body and Posa aircraft carbs.
Paul Lamar ...No rotor no motor.
Hi Paul,
Rather than 16 different drill sizes have you considered using one size
and varying the hole spacing to achieve the correct fuel flow for the
air allowed thru. This may be easier and less expensive. Also, remember
to account for the cumulative effect ( when hole 4 is uncovered and
flowing, holes 1,2,and 3 are also flowing ) FWIW Dave M
The hole spacing must be constant as the feed hole is of limited
size. Probably close to .125" or 1/8th of an inch. The idea is... as
the slide moves the feed hole matches up with the next larger hole
in the slide. If we are lucky the feed hole
will partially match up with two slide holes while it is between
them. The Teflon slide is acting like a selector valve. The slide hole
spacing cannot be two wide as the fuel would be cut off between holes.
Feeding more than two holes at a time is probably not practical
as the slide holes would have to be less than 10 thou or .010" inch
in diameter. Otherwise we would get too much fuel and the engine would
run too rich. Even if we used only one or two psi fuel pressure.
That presents a serious hole drilling problem.
Paul Lamar ...No rotor no motor.
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