Sender: <marv@lancaironline.net> (Marvin Kaye)
To: flyrotary
Date: Sat, 26 Apr 2003 19:51:26 -0400
Message-ID: <redirect-2148543@logan.com>
From: "Marko Bewersdorff" <marko@bewersdorff.com>
Subject: RE: [FlyRotary] EGT Gauge
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The way the temp probes work is they create a small voltage dependent on the
temperature between the different metals.
As long as you keep your connection to the copper wire inside the cabin or
alike where the temperature is not way hot and not changing much, there will
be little error.
If you use your EGT for leaning only it doesn't matter what the absolute
temperature is nor that it may change a little with different ambient temps.
After all you lean until you like what you see and that's that - most EGTs
don't even use a dial with absolute degree markings.
If you have a turbo it is a different thing then you need an accurate
absolute EGT and I would recommend a real EGT gauge (i.e. not Westach or
other crap*) that is hooked up via a proper extension wire. Also make sure
that the connection of the lead from the probe to the extension makes
contact between the individual wire leads and not through another metal like
a crimp lug etc. ( twist the probe wire and the extension wire together and
then crimp them together)


Aircraft spruce has EGT and CHT extension wires for about $22 for a 10
footer, page 350 in the 2001 - 2002 catalog.

*A real EGT or CHT gauge has temperature compensation built into the housing
to correct for the junction at the back of the case, I took a westach gauge
apart and there was absolutely nothing inside, wires go straight from the
back connection to the cheap meter. But then for an EGT (non turbo) it is
good enough. I would not recommend them for CHTs on an air-cooled engine
though.

re

Marko

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Rino
Sent: Saturday, April 26, 2003 11:45 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] EGT Gauge


Does anyone know what happens if I use regular copper wires to connect
my EGT probe to the gauge.
It is impossible to find the required length, proper EGT extension leads
for a pusher type engine.
I have a Sky Flight EGT Gauge that require a K type probe.

Rino
Glass Goose C-FZNW
13b turbo

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