I agree, Mark, that your suggestion
would probably get you as close to an equivalent CHT as
we can get.
But, I'm still not understanding what that would usefully provide that is
worth more than your coolant temps.
I presume that if for some reason
the engine temperature were to rapidly increase (perhaps
due to detonation or other combustion events) that the
CHT reading would provide quicker information on the
condition than would the coolant temp so perhaps you
could take corrective action before damage. Might be a
comfort factor knowing "CHT" if using forced induction
on a rotary as things can happen pretty fast when at
high boost levels.
Ed
Sent: Sunday, August 19, 2012 8:48 PM
Subject: [FlyRotary] Re: EM2 CHT ?
Seems that this will tell you the coolant temp near the
plugs, but not the CHT. If you want to measure the CHT,
you'll need to locate a thermo-couple down near the steel
liner. You can do this by drilling a small hole down into
the web adjacent to the leading plug, stopping at the steel
liner. Then insert a thermo-couple down into the hole so
that it is touching the steel liner. Now you're reading the
temps nearest the combustion chamber, closest thing we have
to CHT.
Mark
On Sun, Aug 19, 2012 at 10:02 AM,
<hoursaway1@comcast.net>
wrote:
Sounds
like a plan to me Ed, should have time Sun. to
do. David
From: "Ed Anderson" <
eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <
flyrotary@lancaironline.net>
Sent: Saturday, August 18, 2012 6:54:35 AM
Subject: [FlyRotary] Re: EM2 CHT ?
I think I would run the
engine at operational rpms (>5000) and
watch the coolant/oil temperatures - when they
got to my maximum limit, I would check the CHT
reading and perhaps add 50 degrees for the
limit (to start with). If I got a lot of
false alarms at that margin I would try
another 50 deg. Just a WAG.
Ed
Sent: Friday, August 17, 2012
10:20 PM
Subject: [FlyRotary] EM2 CHT ?
What are we using for high temp numbers from
the CHT sensors on the 13B rotary, I have the
under the spark plug style sensors bolted to
each rotor housing in some factory threaded
holes just above the spark plugs, not really
the hottest spot but the holes were already in
place so I KISSed it & moved on, now I
need to set my high temp warning limit &
do not know what to use. Possibly do an eng.
run with upper cowl off & check
bolt/sensor temp with a lazer temp gun at
about 4000 RPM & go another 50 deg.
higher? Ideas? David R. Cook RV6A Rotary
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