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Date: Mon, 17 Apr 2006 09:20:50 -0500
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Typical EGT
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I will be doing EGT's 1"-2"  away from the exhaust port and likely will 
have a Turbine inlet temp probe on the turbo housing. Once i get the two 
EGT's to match between rotors, I intend to lean/manage the engine based 
on the the TIT. Right now the exhaust manifold is down at the shop 
having the tailpipe made up.

Dave

Tracy Crook wrote:

>  Well, don't get quite that comfortable with it.   I am not a turbo 
> expert (no Holiday Inn visits either) but there is typically a 200 deg 
> drop after the turbo so 1800 down stream may represent 2000 upstream, 
> not a feel good number.  Just a gut-feel number, but try 1760 
> down-stream EGT redline and see if you can live with it.
>  
> Any of you turbo guys ever measure upstream EGTs?  I'm shooting in the 
> dark here.
>  
> Tracy
>  
>
>     ----- Original Message -----
>     *From:* John Slade <mailto:sladerj@bellsouth.net>
>     *To:* Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
>     *Sent:* Sunday, April 16, 2006 2:29 PM
>     *Subject:* [FlyRotary] Re: Typical EGT
>
>     I'm measuring downstream of the turbo.
>     I guess I'll just set the alarm up to 1800 and stop worrying about it.
>     Thanks.
>     John
>
>     Tracy Crook wrote:
>     > Hells' bells John, 1650 on takeoff is stone cold.  I normally
>     saw 1760
>     > - 1800 on a NA 13B.  Turbos normally run higher (pre- turbo)
>     than NA.
>     > 
>     >  BTW, which side of the turbo are you measuring?  Temps are lower
>     > down-stream.  Another observation - A turbo with LESS
>     restriction will
>     > give higher EGT readings down-stream of the turbine so this
>     could be
>     > normal.
>     > 
>     > Tracy
>     >
>     >     ----- Original Message -----
>     >     *From:* John Slade <mailto:sladerj@bellsouth.net>
>     >     *To:* Rotary motors in aircraft
>     <mailto:flyrotary@lancaironline.net>
>     >     *Sent:* Saturday, April 15, 2006 8:33 PM
>     >     *Subject:* [FlyRotary] Typical EGT
>     >
>     >     Rotarians,
>     >     When I installed my T04 turbo I must have damaged the EGT
>     probe. I
>     >     was
>     >     seeing 500F on take-off. Today I installed a new probe and it
>     >     looks like
>     >     the new turbo runs a lot hotter than the old one. While
>     installing
>     >     the
>     >     new probe I noticed that the ceramic coating on the turbo had
>     >     turned to
>     >     dust.
>     >
>     >     On take-off today I saw 1730 and the EGT alarm went off. I
>     backed off
>     >     the throttle and flew with it down around 1600, but that
>     only gets me
>     >     around 4500 rpm and zero boost. Bring it up to 5000 rpm and
>     I see
>     >     1650.
>     >     This is with the mixture a little higher than mid scale.
>     Richen the
>     >     mixture a tad and I can reduce EGT by 30 F or so. If I bring the
>     >     rpm up
>     >     to 5300 the EGT is up to 1700 pretty quickly. Oil and coolant
>     >     temps are
>     >     fine at around 180 - 190. I put 3.3 hours on the plane today
>     with no
>     >     other issues, but at 4500 rpm I don't get there very fast. :(
>     >
>     >     What do other rotary flyers consider max EGT, and what could be
>     >     causing
>     >     it to be so high (if this is really high)?
>     >     John
>     >     N96PM
>     >     60.5 Hrs.
>     >
>     >     --
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>
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