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


How are you monitoring your fuel pressure?


Matt-


With an electronic sensor and an EFIS in the cockpit

There is also a steam gage but I can't see it as it is
under the cowl. I need somebody to stand out there
and read it with the cowl off. Somebody I can trust
to not get in the way of the prop.

Here is a short movie so you can hear it run.


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I suspect the manifold pressure is jumping up and down affecting
the pressure regulator and what Tracy's EC manifold pressure sensors
are seeing.

Here is how the road racers damp the manifold pressure for EFI.

This is easy to try so it will be one of the first attempted
fixes.

Paul Lamar