From: RWolf99@aol.com
Message-ID: <c8.f0237ae.27876ad0@aol.com>
Date: Fri, 5 Jan 2001 13:22:08 EST
Subject: #3 Cylinder Problem
To: lancair.list@olsusa.com
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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To the gentleman with #3 cylinder running 30 degrees hotter than the others --

I had a thought the other day, relative to changing probes.  I suspect that 
the temperature probe is a simple thermocouple -- they either work or they 
don't.  Inaccuracies would come from the amplifier in your electronics box 
rather than the probe itself.  Switching the probes wouldn't necessarily tell 
you if the 30 degree offset is real or artificial unless you switch the 
amplifier channels as well.

In other words, when you want to change probes to see if the problem is real 
or an artifact of the probe, don't just unplug the wires and swap probes.  
Swap the wires, too.  So you'll have the old #3 probe and wire on #1, and the 
old #1 probe and wire on #3.  Your display will be wrong -- what's listed as 
#1 will actually be #3, and vice versa.

If the 30 degree offset migrates to the other cylinder, your problem is 
solved.  Rather, you have a new problem -- which one is right?  (This could 
probably be addressed by putting the probes in boiling water and reading 
which one said it was 212 F)

- Rob Wolf
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