To coordinate a fuel needle valve with the slide throttle I think we
need to regulate the pressure for leaning, similar to a float
carburetor. Anybody have a better idea? Karibian
Yep. Pulse Width Modulate the fuel pump with only the amount
of fuel you need. You do save all the messages we have uploaded
here do you not? :) You can make folders with subject headings
and drag the good messages over and drop them in.
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Subject: Source for miniature regulator? Cheap EFI?
Date: 02/10/2007 06:11 AM
"This message triggered an idea Doc. A combination of
EFI and the low pressure dribble system. Since one needs
a low pressure electric fuel pump no matter what... control the pump
pressure PWM with a 44 cent PIC microcomputer that takes data in
from a MAP sensor, RPM and a leaning knob pot on the instrument
panel.
To quote Don Lancaster:
"The PIC microprocessor from Microchip Technology has now
become the hardware component of the decade. To the point
where it is laughingly absurd to ever again use a 555 timer."
Voila!!! Super simple low pressure EFI!!!! The PIC has an A to D
for the MAP sensor and leaning knob and an interrupt
for the RPM. Should take all of an hour to write the BASIC
program :) No injectors. Small holes in the p-port slide throttle
instead. No injector wires in the cowl to burn. Only wires go
to the low cost, low pressure, off the shelf fuel pump.
No leaning needle valve. No metering ramp in the slide throttle
or multiple holes. Just one small hole There is
a small hose to the MAP sensor mounted on the PIC PC board which
is just behind the panel with the PC board mounted leaning pot
shaft sticking through the panel.
If you want to spend a bit more than 44 cents on the PIC you can
add a USB data acquisition interface and download the flash stored
historical data to a PC. Since THE pic knows the fuel flow it knows
the GPH. Since the PIC knows the GPH and it could take NEMA 0183
ASCII data in from a GPS and calculate and display the MPG IN
REAL TIME!!!!
Handy for checking winds aloft.
Now if you add the clutch throw out bearing dyno you could
display REAL TIME HP and BSFC. Tracy should be doing this anyway
since he is building both the PSRU and the EFI.
This is probably the best idea I have had in the last
couple of years if I do say so myself :)
BTW Sorry corporations. You can't patent it as I have
published it here first."
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You lean this system with a knob connected to a pot on the
instrument panel that trims the PWM going to the
fuel pump.
Paul Lamar ...No rotor no motor.
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