In order to reduce pulses in the manifold
pressure sense lines, I have done the following:
There are two manifold pressure outlets in
the rear of the intake manifold plenum. One of these is attached to a
5/16 hose and “T”s to the fuel pressure regulator and then
continues to join with the other hose described next.
The other manifold pressure outlet is
attached to a 5/16 hose and takes a different route but ends up “T”ed
into the first hose just prior to the EC-2. These two hoses join and go
thru a single fuel filter. (the idea is that the filter will dampen out
any pulses.)
After the filter, they separate at a “T”
and then go to the two pressure inlets on the EC-2.
My idle seems fine at about 1500 rpm
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of shipchief@aol.com
Sent: Tuesday, May 04, 2010 9:15
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: tuning
issues
I had some trouble with my manifold
pressure sense lines. In my case, they picked up oil from the bottom of the
intake plenum (before I put a restrictor in the turbo oil supply line) So the
lines went downhill to the EC-2, causing a change in static pressure and
probably dampened the response.
Dynamic pulsations in the manifold where
the sense line connects could confuse the controller as well?
I
installed small tubes inside my plenum to sense pressure from the center of the
cavity, and may make an oil trap at the low point if the problem persists, but
I also might install a restrictor, as I have a ragged idle. Or it could be me,
as I have very little ground running time yet.
-----Original
Message-----
From: Bill Bradburry <bbradburry@bellsouth.net>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Tue, May 4, 2010 11:42 am
Subject: [FlyRotary] Re: tuning issues
I am using the Iridium plugs now.
I will check the crank angle sensor,
Ernest, but seems to me it is mounted on a casting on the Renesis. I
could be wrong. I will have to look.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Tuesday, May 04, 2010 2:37
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: tuning
issues
I cured an intermittent mis-fire on my 20B
by switching to the Iridium plugs, same as those used in the Renesis engines.
I don’t think it is fuel filter related. The fuel pressure is holding
steady during this time. I think it is some kind of misfire, but have no clue
as to what could be causing it or how to go about diagnosing it. It is both
random and intermittent and happens at various rpms. Nothing seems consistant
about it happening.
What should I check?
Bill B