Greg,
Wouldn't it be desirable to know the EGT of each rotor so you could tell what's going on in each? These would be located about an inch from the exhaust ports. There are modes in the EC-2 for adjusting the mixture of each rotor in order to balance them. Without an EGT sensor for each individual rotor, you wouldn't be able to do that. You could have a dirty injector causing a lean condition and not know it until you engine has been damaged.
And if it were me, I would also want to know the TIT, so a probe on the turbo inlet would be needed.
Finally, I would want to know the temperature of the compressed air after the intercooler so I wouldn't destroy my engine through detonation.
My 2 cents,
Mark S.
On 6/11/08, Greg Ward <gregw@onestopdesign.biz> wrote:
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
|