Subject: Rotary EGT!
From: Rotary Engine
Date: 5/6/2006, 2:43 AM
To: AAme



    > Hey Paul,
    >
    > Do you snoop around the Canard Aviation Forum?  I ran across this
   note
    > from John Slade:
    >
    > "A quick update for those interested in the T04 Turbo....
    > I now have 6.6 hours on the new turbo (60.5 on the plane) and it
   seems
    > to be behaving very well. But - I have a new problem. EGT. I must
   have
    > broken the EGT probe during installation of the heat shield, so I was
    > getting EGT readings of 500F or so. I installed a new probe, and
   now my
    > EGT readings are very high - 1700+ on take-off. Today I backed
   off the
    > throttle to get the EGT below 1650 and continued on my trip to Ft
   Myers,
    > Venice and back. The engine, turbo and IVO prop performed
   consistently
    > well on a 3.3 hour trip. No leaks, stutters or cooling problems - but
    > this EGT seems very high and it's stopping me from using the
   power. So
    > far I'm thinking that the timing may be a little off. (Buly just
   had a
    > similar revelation). I don't think it's calibration - these K type
    > probes are very accurate, and the exhaust is definitely running hot.
    > Could the T04 somehow increase EGT by passing the gas (excuse me)
   more
    > quickly?
    > Any thoughts?"
    >
    > That's pretty hot for post-turbo EGT..
    >
    > Here's a link to a fairly long thread:
    >
    >
   http://canardaviationforum.dmt.net/showthread.php?t=2058&page=5&pp=15
   <http://canardaviationforum.dmt.net/showthread.php?t=2058&page=5&pp=15>
    >
   <http://canardaviationforum.dmt.net/showthread.php?t=2058&page=5&pp=15
   <http://canardaviationforum.dmt.net/showthread.php?t=2058&page=5&pp=15>>
    >
    >
    > Matt-
    >
    > I have no idea what is going on Matt. According to Francois
    > the unburned hydrocarbons are burning in the exhaust
    > manifold and or the turbo. Perhaps the RX8 engine might
    > be a better choice as it supposedly recycles unburned fuel
    > with a cooler exhaust. Francois is doing some  turbine blade
    > temperature test by painting the turbine blades with special
    > paint.
    >
    > To really know what is going on the intake air temp should
    > be monitored and the engine leaned over a wide range measuring
    > the mixture ratio with a wide band mixture monitor to see
    > what effect this has on TIT. In other words get data on
    > TIT verses mixture ratio. Could be when leaned properly
    > with a a cool intake charge to discourage detonation  or
    > even anti detonation fluid injected  the  data
    > will show the TIT coming down with a leaned mixture.
    >
    > On the other hand 1800 F may be no problem for an Inconel
    > turbine at modest RPMs. Does John have an Inconel turbine?
    > One needs to know the RPM of the turbine as that has a serious
    > affect on the life of a turbine blade due to centrifugal force.
    >
    > Paul Lamar ...No rotor no motor.



   Hi Matt, where's your EGT probe mounted?

   B
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   Brian D. Cain -/- Dallas/Ft. Worth, TX -/- bdc@bdcmotorsports.com
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We're talking about John Slade's airplane..  I think he has
his probe after the turbo, but I don't know precisely where
it's mounted.


Matt-

More evidence the excess fuel is burning in the turbo. He needs
three thermal couples. One at the outlet of the turbo and
one on each exhaust port ahead of the turbo.  No substitute
for extensive instrumentation and methodical data gathering.

Paul Lamar ...No rotor no motor.

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