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From: "rijakits" <rijakits@cwpanama.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-601265@logan.com>
Subject: Re: [FlyRotary] Re: EGT probes
Date: Mon, 10 Jan 2005 10:18:43 -0500
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Hi guys,

on the "other list" there was just a report from Francois/Mistral about
EGTs. Mistral found that EGT will, under certain conditions, actually RISE
the further down the exhaustgas travels from the exhaustport.
If Jim suggested to get some distance between the ports and the probe for
reasons of high temp versus possible damage to the probes - you might want
to think about this again.
As far as I understand, this was worst with very lean mixture. Has to do
with increased oxygen levels further down the stream and burning up the
non-burned mixture there.
If you run a turbo, maybe you want to consider a little more space between
the exhaustport and the turbo, so everything can burn and produce some more
heat/pressure to work off in the turbo.
Would that be a Rotary-Afterburner? :))    ...or Intermediate-burner?

The real question, in light of the Mistral experience, is: What exactly do
you want to measure and depending on that, where would you have to place the
probes?
Do you just want to measure any difference between the rotors or are you
interested in absolute values?
In the first case you probably could put the probes anywhere before the
pipes merge into the turbomanifold. In the later you might want to contact
Francois from Mistral.......
For everyone on the list it would be rather interesting (I guess...) what
happens temp-wise on every 1/4", but then you are going heavy into R&D.

Would you have space to make a 1-4" spacer, which you could drill for a
probe for every 1/4-1/2". Don't have to put that many probes in there, but
change the probe from one location to the next in a row of runs. This should
give some interesting results on which to base a permanent
installation.......

Thomas J. (Having it easy to throw around concepts, not having anything to
play with and getting rid of hard-earned......)


----- Original Message ----- 
From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, January 10, 2005 12:27 AM
Subject: [FlyRotary] Re: EGT probes


> Jim, 2" away is the turbo itself or very close. I don't want to tap the
> turbo, since if I have to swap turbo's. Nobody would take drilled housing
> for a core.
> Buly
>
> On 1/10/05 12:21 AM, "Jim Sower" <canarder@frontiernet.net> wrote:
>
> > I'd try to put the probes at least 2" - 2.5" from the block.
> >
> > Bulent Aliev wrote:
> >
> >> Hi Guys,
> >> I removed my turbo manifold today for ceramic coating, so I want to
install
> >> two EGT probes, one for each rotor. I want to drill and tap into the
cast
> >> iron manifold about 1" away from the exhaust ports. My questions are:
> >> 1. Any draw backs?
> >> 2. Recommendations for probes that will stand up to the heat in this
> >> location and will work with the EM2.
> >>
> >> My engine starts instantly every time. At the beginning I kept the
mixture
> >> knob to the center position. Any movement to the left and the engine
would
> >> stumble. Now I'm noticing the knob is fully to the left and it is rich.
Not
> >> too rich but more than before? I guess it is time to get into the
> >> programming stuff?
> >> I'm drawing big crowds at the airport with this engine. Today I had to
put a
> >> yellow rope on the hangar doors so I can work. Handed chairs to the old
> >> timers, the youngins had standing room only :)
> >>
> >> Buly
> >>
> >>
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html