Greg;
Yeah; what Mark said. Except I think
I’d put them more than an inch from the port. Mine are about 2”
from the port. I have had one EGT TC failure, and one I replaced where
the prob was in the EC2; but in both cases the TC extension on the inside of
the pipe was slightly bent away from the port. These are the inconel
sheath, clamp-in type that extend an inch into the flow. I conclude that
the high temp and strong pulses cause them to bend a bit over time. A
little further downstream may read a bit lower, but may increase the lifespan. (I
was going to send a photo, but the batteries in my camera were dead).
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Greg Ward
Sent: Tuesday, June 10, 2008 10:37
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Sensors
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.
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