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 -----
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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