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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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