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Many thanks, Steve. That's exactly what I needed verified about
orientation of the sensor, & it'll make mounting a lot simpler
for me.
Charlie
On 06/26/2011 03:01 PM, Steven W. Boese wrote:
Charlie,
This morning I did some simple
tests with the floscan sensor I have on my engine stand.
This fuel system uses a stock fuel pressure regulator and a
return to the tank taken before the floscan and the
injectors. The injectors are normally dead ended as is
common in present automotive systems. For the tests, I
installed an adjustable valve and second return after the
injectors to simulate fuel flow through the injectors. The
attached image shows two orientations that were
tested. Changing from the normal to the angled and rotated
position showed a decrease in fuel flow reading of 2 to 4%
at flow rates of 11.7 and 1.10 gal/hr. This could probably
be taken care of in the calibration of a system. At both
flow rates, I also introduced air into the lines and
there was no indication of air elimination being a
problem. These results are for a steady flow through the
floscan, not a pulsed flow as would be the case when the
injectors are in operation, but I have not seen any
indication that this makes a significant difference.
In my plane, I used steel fuel
lines from the RX7 donor car to replace the rubber fuel
lines on the engine. These have an ID of 0.26". This fuel
system uses fuel pumps purchased from Tracy, a stock fuel
pressure regulator and return after the injectors, and a
duplex fuel selector valve. The return to one tank is AN6
aluminum line from the valve emptying into the root rib of
the fuel tank. The return to the other tank is AN6 to the
root rib of the tank and AN4 from there to the normal vent
location near the fuel filler cap. While I did not use AN4
lines to feed the engine, there has been no difference in
the performance of these two returns that I have
noticed.
Steve Boese
RV6A, 1986 13B NA,
RD1A, EC2
OK, 2 questions.
1. For those using Floscan fuel flow transducers:
Anyone have a floscan 201 sensor that's working ok while
mounted in other than a horizontal position? My most
convenient location would have the fuel path flowing up
at a 45 degree angle. In addition, the mounting can have
the wires 'up', but mounting would be a bit more
convenient with the wires pointing horizontally.
2. While researching Q1, I found a note from the guy who
makes Airflow Performance fuel injection systems for
Lycs (they run at around 15-30 psi), recommending 1/4"
(AN-4) fuel lines firewall forward to minimize fuel
heating & vapor lock. I've already been tempted to
consider this instead of -6 (saves weight, running lines
is easier, etc) because the injection pumps &
automotive systems use small diameter lines, but was
reluctant to go against 'convention'. Has anyone who's
flying an injected rotary used -4 fuel lines to feed the
engine?
Thanks,
Charlie
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