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robin1(at)mrmoisture.com
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 Posted: Tue Feb 09, 2010 5:03 pm Post subject: Cylinder Temp Range |
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It’s hard for those that know me on the list to believe I am about to ask this question but…
How low is too low for CHT’s? As many of know I have been battling high CHT’s due to my cowl/plenum configuration. Recently I have been flying LOP which has greatly reduced my CHT’s which was the goal all along. I now have significant control over CHT’s when LOP as a function of that funny red knob.
My question is how low is too low to run cylinders? I have read pretty consistently about shock cooling and to keep the cylinder temp change under 50 degrees / minute but I don’t find any consistent numbers on the bottom end of the cylinder temperature operation range. Is 320 acceptable? I read about some pilots in cold regions running in the low 200’s (mostly 4 cyl. Lycoming). That seems unreasonably low to me. Heck, with the James cowl and plenum I am able to get to low 200’s just by opening the hangar door.
Robin
[quote][b]
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Tue Feb 09, 2010 5:20 pm Post subject: Cylinder Temp Range |
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320's should be fantastic.
Tim Olson - RV-10 N104CD
do not archive
Robin Marks wrote:
| Quote: | It’s hard for those that know me on the list to believe I am about to
ask this question but…
How low is too low for CHT’s? As many of know I have been battling high
CHT’s due to my cowl/plenum configuration. Recently I have been flying
LOP which has greatly reduced my CHT’s which was the goal all along. I
now have significant control over CHT’s when LOP as a function of that
funny red knob.
My question is how low is too low to run cylinders? I have read pretty
consistently about shock cooling and to keep the cylinder temp change
under 50 degrees / minute but I don’t find any consistent numbers on the
bottom end of the cylinder temperature operation range. Is 320
acceptable? I read about some pilots in cold regions running in the low
200’s (mostly 4 cyl. Lycoming). That seems unreasonably low to me. Heck,
with the James cowl and plenum I am able to get to low 200’s just by
opening the hangar door.
Robin
*
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jcumins(at)jcis.net
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| Posted: Tue Feb 09, 2010 5:29 pm Post subject: Cylinder Temp Range |
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Robin
320 is fine for cruise cht temp as far as I know. We see them quiet often on the Saratoga that I fly and all is great
John G. Cumins
A&P wow 25 years now.
40864 emp in primer mode but to wet every time I have time to paint here in Northern ca AWW Globel warming.
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Robin Marks
Sent: Tuesday, February 09, 2010 5:01 PM
To: rv10-list(at)matronics.com
Subject: Cylinder Temp Range
It’s hard for those that know me on the list to believe I am about to ask this question but…
How low is too low for CHT’s? As many of know I have been battling high CHT’s due to my cowl/plenum configuration. Recently I have been flying LOP which has greatly reduced my CHT’s which was the goal all along. I now have significant control over CHT’s when LOP as a function of that funny red knob.
My question is how low is too low to run cylinders? I have read pretty consistently about shock cooling and to keep the cylinder temp change under 50 degrees / minute but I don’t find any consistent numbers on the bottom end of the cylinder temperature operation range. Is 320 acceptable? I read about some pilots in cold regions running in the low 200’s (mostly 4 cyl. Lycoming). That seems unreasonably low to me. Heck, with the James cowl and plenum I am able to get to low 200’s just by opening the hangar door.
Robin [/b][/quote]http://forums.matronics.com[/url] - List Contribution Web generous nbsp; --> http://www.matronics.com/c=[/b] [b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Tue Feb 09, 2010 7:25 pm Post subject: Cylinder Temp Range |
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I run my 200 hp Mooney around 290-320 ROP and maybe 20-30 cooler LOP
in Aridzona and points east to NJ. Have 600 hours on my rebuild to
date. Coolest cylinder may be around 270. I only see above 350 on a
hot day during climbout. For normally aspirated engines there really
is no such thing as shock cooling. You might get shock heating if you
apply takeoff power before getting engine temps up a bit.
On Tue, Feb 9, 2010 at 6:01 PM, Robin Marks <robin1(at)mrmoisture.com> wrote:
| Quote: | It’s hard for those that know me on the list to believe I am about to ask
this question but…
How low is too low for CHT’s? I now have
significant control over CHT’s when LOP as a function of that funny red
knob.
My question is how low is too low to run cylinders? I have read pretty
consistently about shock cooling and to keep the cylinder temp change under
50 degrees / minute but I don’t find any consistent numbers on the bottom
end of the cylinder temperature operation range. Is 320 acceptable? I read
about some pilots in cold regions running in the low 200’s (mostly 4 cyl.
Lycoming). That seems unreasonably low to me. Heck, with the James cowl and
plenum I am able to get to low 200’s just by opening the hangar door.
Robin
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD |
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