Any body running an engine notice that or is it just
my RV4? Also the mixture is rapidly varying which of course
could be caused by the rapidly changing fuel
pressure. My pressure regulator is referenced to intake
manifold pressure. Is everybody doing that?

It is so bad I can't believe the engine runs.
Now that I have learned to steer the RV I can focus
on what is going on with the engine :)

Paul Lamar


Paul,
First try pulling the manifold pressure hose from the regulator (then
plug the hose of course)
and run the engine (monitor the fuel pressure in cockpit for
result)..........


Kelly Troyer
*"DYKE DELTA JD2" (Eventually)*
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo

If I pull the hose the tuning will be way off. The engine may
not start run. Worth a try however. I'll just clamp it off
with a large paper clip.

Paul Lamar

Hi   Paul,
                   try putting a very small restrictor in the line to the
manifold, to reduce the pulsations.
      John Burey


Errrr, maybe not.  Don't damp the measurement of the pulsations until
you are CERTAIN why they are there!  A damper only masks the data
.... like putting a bandaid over a bullet hole!  If it is some
resonant interaction between pumps or something there might be real
trouble down the line.

SD

  Hi  Paul,
                   I suggested fitting the restriction in the manifold
vacuum line , not the fuel line. it's probably getting pulsations and
the electronic sensor is sensing as a sample lot and indicating varing
pressure, if the gauge under the cowl could be moved up (with a sky hook
maybe):-) temporarly so it can be seen from the pilots seat, would
answer the question.
                 John Burey

Great minds :) How do you like those cool hose ends?
It was Sunday. I spent so much time on the plumbing I ran
out of time to run it.

Paul Lamar


Perhaps I am talking a little out of line, here, since I haven't been following
this thread closely.

The restriction in the fuel line prior to the sensor is not to dampen out
pulsations but is a safety
measure. It should be put in the fitting at the engine to minimize fuel
sprayage in the event of a hose separation. I believe that it is required in all
store bought craft.

(pardon the font bolding, can't seem to get rid of it)

Perhaps some aeronautical lithium would help for your bi-polar readings

Rich


"bi-polar readings"?????

Paul Lamar

Referring to what we used to call manic depressive illness--- up and
down swings, many times treated by lithium

Rich