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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.
>
> --
> Homepage: http://www.flyrotary.com/
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>
--
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