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As long as we're at it about sensors, how about EGT?
I am turboed on the 20B, and have a 3 into one collector going to the Garrett
turbo. Do I want to have individual EGT's on each pipe, or one on the
exhaust side of the turbo, or all 4? My collector pipes are only about
8-10" before they hit the flange, so here too, I wonder where the best place is
to place the sensors. Thanks for all the input on the MAP, going
to locate it close behind the valve body.
Greg Ward
Lancair 20B, details, details,
details
----- Original Message -----
Sent: Tuesday, June 10, 2008 8:32
PM
Subject: [FlyRotary] Re: Sensors
I have two MAP ports on the rear of my intake plenum
that feed the EC-2. I am taking the pressure from this third port at the
bottom of the manifold to the regulator. I have a vacuum gage…I guess I
should check the steadiness and consistency of all three
ports.
Bill
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Al Gietzen
Sent: Tuesday, June 10, 2008 9:26
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re:
Sensors
Perhaps I should
add that the original line from the sensing ports to the pressure regulator
was quite short; maybe 10”; so there was very little damping
there.
My fuel pressure regulator (Airmotive) is
getting its MAP from the two small (1/8 “) tubes that lay in the primary ports
on the Renesis…Are you saying that I should move this pressure reference to
someplace else? You say you know it is not good…How do you know
this?
Bill
B
Bill;
I was
measuring fuel pressure to the fuel rails to verify the EM2 calibration.
The needle on the gauge was swinging very rapidly from about 20 to 40. I
don’t recall what RPM, but I guess near idle. Perhaps stating that “it
is not good” is an overstatement, and perhaps it just happened that the
pressure pulses hit a resonance in the gauge; but my judgment was that it
could affect the engine operation and could be damaging to something else long
term. I had already put damping in MAP line to the EC2, so I decided to
T it into that line, and the pressure pulsing went
away.
I have
a 3-barrel TWM TB on a short intake manifold. The MAP sensing ports are
just downstream of the throttle plates.
Al
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