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ianxbrown
Joined: 16 May 2009
Posts: 80
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 Posted: Wed Sep 16, 2009 5:17 am Post subject: O-320 Overheating on Climb Out |
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Hello List,
I have about 45 hours on my RV-9A and I've been tracking an overheating engine. On climb out, at about 90kts the CHT will rise to 500 degrees F briefly and then settle down to about 375 in the cruise. This is on cylinder # 3, with the other cylinders being 20 degrees or more cooler. The engine came off a Cessna 172 and runs very well.
The baffling is standard, and it seals well, especially in the area of this cylinder. (it's the simplest area of the baffles to check too).
Is this temperature abnormal?
Does anyone have experience with the same problem?
For the moment I've just been reducing the angle of my climb to increase airspeed but I makes it take longer to get to cooler air.
Ian Brown,
Bromont, QC
RV-9A C-GOHM
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Dale Ensing
Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC
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| Posted: Wed Sep 16, 2009 6:18 am Post subject: O-320 Overheating on Climb Out |
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Ian,
Suggest climbing (at) 100 knots minimum. Don't overheat trying to get to cooler air which may not be that much cooler in the summer time.
This is kind of like going faster to get to a gas station quicker when you are low on fuel. The fuel burn rate will go up in the attempt to not run out of gas.
just my 2 cents worth of advise.
Dale Ensing
RV-6A
[quote] ---
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Dale Ensing
RV-6A
Aero Plantation
Weddington NC |
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rv6n(at)optonline.net
Guest
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| Posted: Wed Sep 16, 2009 6:52 am Post subject: O-320 Overheating on Climb Out |
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That seems awfully hot! 6nbsp; I am no A 6amp;P so I don 7t remember the maximum allowed C as stated in the Lycoming 6nbsp;manual C but I have my EFIS 6nbsp;set to red-line at 400 degrees for my O-360 E 6nbsp; They often get to that temp on take-off on a hot day but I have never allowed them to get as high as yours are E 6nbsp; 6nbsp;I have been told that the cylinders start to get soft at 450 deg E 6nbsp; I too had been flying a slow climb-out to keep the temps E down E 6nbsp; 6nbsp;Many builders have experienced the same problem and have installed various versions of a small baffle in front of 3 1 cylinder in order to divert cooler air further back E 6nbsp; If you do an archive search you will probably find a lot of discussions of potential problems and solutions E 6nbsp; I intend to install the small baffle 6nbsp;if I ever get to fly again E
6nbsp;
Bob
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Knicholas2(at)aol.com
Guest
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| Posted: Wed Sep 16, 2009 7:16 am Post subject: O-320 Overheating on Climb Out |
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I had the same problem with my 0-320 E2D that came out of a Cessna 172. Not only would the CHTs get dangerously high, but the engine would occasionally "hic-up". Very scary when you are in the clouds at 8000 feet.
As it turns out, the air intake dynamics in a C172 called for a much leaner running carb than that needed for the high air flow RV. I want to give proper credit here, as my help came from Mr. Bart Lalonde (spelling?) from a British Columbia engine rebuilder whose name escapes me right now... (Sorry Bart!)
With Bart's help, he shipped me a different carb jet that allows the engine to run more rich. It only took me a couple of hours of work and the difference was amazing. Now my CHT's rarely go above 450 even on a hot day. Plus, the annoying "hic-up" went away.
I hope this helps.
Kim Nicholas
Auburn, WA
RV9A 350 hours.
In a message dated 9/16/2009 6:19:14 A.M. Pacific Daylight Time, ixb(at)videotron.ca writes:
| Quote: | Hello List,
I have about 45 hours on my RV-9A and I've been tracking an overheating engine. On climb out, at about 90kts the CHT will rise to 500 degrees F briefly and then settle down to about 375 in the cruise. This is on cylinder # 3, with the other cylinders being 20 degrees or more cooler. The engine came off a Cessna 172 and runs very well.
The baffling is standard, and it seals well, especially in the area of this cylinder. (it's the simplest area of the baffles to check too).
Is this temperature abnormal?
Does anyone have experience with the same problem?
For the moment I've just been reducing the angle of my climb to increase airspeed but I makes it take longer to get to cooler air.
Ian Brown,
Bromont, QC
RV-9A C-GOHM
|
[quote][b]
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timb
Joined: 16 Apr 2008
Posts: 77
Location: Frankston, Texas
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| Posted: Wed Sep 16, 2009 7:24 am Post subject: O-320 Overheating on Climb Out |
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Ian,
That is way too hot. Reduce your climb out angle to 110 which should put the nose right on the horizon anyway for visibility. Then you need to find what is needed to cool it down. I went over all my baffle install to find any leaks or blow by areas. There were a couple of small ones but nothing major. Then I found in the front where the air inlet ramps are the air could get around and into the low pressure side. I blocked those off. I then added the louvers to the bottom and had some more success. To this point it has been cumulative success to get my climb out temps to around 420. I was never much above 450 and 500 is probably doing damage to your engine.
My airplane is an RV-6 with O-360 A1A normally aspirated, constant speed prop. As was previously mentioned, there is lots of reading in the Archives about this stuff but I would do my best not to let it get that hot any more.
Tim Bryan
RV-6 Flying
N616TB over 120 hours now
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Ian
Sent: Wednesday, September 16, 2009 7:59 AM
To: rv-list(at)matronics.com
Subject: O-320 Overheating on Climb Out
Hello List,
I have about 45 hours on my RV-9A and I've been tracking an overheating engine. On climb out, at about 90kts the CHT will rise to 500 degrees F briefly and then settle down to about 375 in the cruise. This is on cylinder # 3, with the other cylinders being 20 degrees or more cooler. The engine came off a Cessna 172 and runs very well.
The baffling is standard, and it seals well, especially in the area of this cylinder. (it's the simplest area of the baffles to check too).
Is this temperature abnormal?
Does anyone have experience with the same problem?
For the moment I've just been reducing the angle of my climb to increase airspeed but I makes it take longer to get to cooler air.
Ian Brown,
Bromont, QC
RV-9A C-GOHM
[quote][b]
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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_________________
Tim Bryan
RV-6 Flying
N616TB |
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timb
Joined: 16 Apr 2008
Posts: 77
Location: Frankston, Texas
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| Posted: Wed Sep 16, 2009 8:21 am Post subject: O-320 Overheating on Climb Out |
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Bart is with Aero Sport Power in Kamloops BC.
1-250-376-6213
Tim Bryan
RV-6 Flying
N616TB over 120 hours now
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Knicholas2(at)aol.com
Sent: Wednesday, September 16, 2009 10:10 AM
To: rv-list(at)matronics.com
Subject: Re: O-320 Overheating on Climb Out
I had the same problem with my 0-320 E2D that came out of a Cessna 172. Not only would the CHTs get dangerously high, but the engine would occasionally "hic-up". Very scary when you are in the clouds at 8000 feet.
As it turns out, the air intake dynamics in a C172 called for a much leaner running carb than that needed for the high air flow RV. I want to give proper credit here, as my help came from Mr. Bart Lalonde (spelling?) from a British Columbia engine rebuilder whose name escapes me right now... (Sorry Bart!)
With Bart's help, he shipped me a different carb jet that allows the engine to run more rich. It only took me a couple of hours of work and the difference was amazing. Now my CHT's rarely go above 450 even on a hot day. Plus, the annoying "hic-up" went away.
I hope this helps.
Kim Nicholas
Auburn, WA
RV9A 350 hours.
In a message dated 9/16/2009 6:19:14 A.M. Pacific Daylight Time, ixb(at)videotron.ca writes:
| Quote: |
Hello List,
I have about 45 hours on my RV-9A and I've been tracking an overheating engine. On climb out, at about 90kts the CHT will rise to 500 degrees F briefly and then settle down to about 375 in the cruise. This is on cylinder # 3, with the other cylinders being 20 degrees or more cooler. The engine came off a Cessna 172 and runs very well.
The baffling is standard, and it seals well, especially in the area of this cylinder. (it's the simplest area of the baffles to check too).
Is this temperature abnormal?
Does anyone have experience with the same problem?
For the moment I've just been reducing the angle of my climb to increase airspeed but I makes it take longer to get to cooler air.
Ian Brown,
Bromont, QC
RV-9A C-GOHM
http://www.matronics.com/Navigator?RV-List |
0123456789
[quote][b]
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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_________________
Tim Bryan
RV-6 Flying
N616TB |
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yenduc(at)sbcglobal.net
Guest
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| Posted: Wed Sep 16, 2009 8:27 am Post subject: O-320 Overheating on Climb Out |
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An air dam infront of the #1 cylinder is often needed particularly with the older baffle kits Mine os about 3/4 " high and runs from the ramp base to cover the lower edge of the exposed fins on the #1 cylinder head. I had to experiment several times with the height of the "air dam" until the temperature of the #1&3 cyliners was balanced.
Dave(at)RAL
Sent from my iPhone
On Sep 16, 2009, at 8:24 AM, "Tim Bryan" <n616tb(at)btsapps.com (n616tb(at)btsapps.com)> wrote:
[quote]
Ian,
That is way too hot. Reduce your climb out angle to 110 which should put the nose right on the horizon anyway for visibility. Then you need to find what is needed to cool it down. I went over all my baffle install to find any leaks or blow by areas. There were a couple of small ones but nothing major. Then I found in the front where the air inlet ramps are the air could get around and into the low pressure side. I blocked those off. I then added the louvers to the bottom and had some more success. To this point it has been cumulative success to get my climb out temps to around 420. I was never much above 450 and 500 is probably doing damage to your engine.
My airplane is an RV-6 with O-360 A1A normally aspirated, constant speed prop. As was previously mentioned, there is lots of reading in the Archives about this stuff but I would do my best not to let it get that hot any more.
Tim Bryan
RV-6 Flying
N616TB over 120 hours now
From: owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com) [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Ian
Sent: Wednesday, September 16, 2009 7:59 AM
To: [url=mailto:rv-list(at)matronics.com]rv-list(at)matronics.com (rv-list(at)matronics.com)[/url]
Subject: O-320 Overheating on Climb Out
Hello List,
I have about 45 hours on my RV-9A and I've been tracking an overheating engine. On climb out, at about 90kts the CHT will rise to 500 degrees F briefly and then settle down to about 375 in the cruise. This is on cylinder # 3, with the other cylinders being 20 degrees or more cooler. The engine came off a Cessna 172 and runs very well.
The baffling is standard, and it seals well, especially in the area of this cylinder. (it's the simplest area of the baffles to check too).
Is this temperature abnormal?
Does anyone have experience with the same problem?
For the moment I've just been reducing the angle of my climb to increase airspeed but I makes it take longer to get to cooler air.
Ian Brown,
Bromont, QC
RV-9A C-GOHM
[b]
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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jhnstniii(at)aol.com
Guest
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| Posted: Wed Sep 16, 2009 6:20 pm Post subject: O-320 Overheating on Climb Out |
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Ian--In addition to the other suggested fixes, you may consider moving the upper ramp in front of #1 forward. The flow through the inlet in front of #1 is pinched because the right cylinder bank is forward of the left cylinder bank. You'd have to cut it out, trim it, and re-glass it farther forward. Put your hand into each inlet and you will see what I mean.
LeRoy Johnston/David White RV6-A "Esperanza" 220 hrs.
--
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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camdaddy
Joined: 19 Sep 2009
Posts: 3
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| Posted: Sat Sep 19, 2009 4:15 am Post subject: Re: O-320 Overheating on Climb Out |
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I've got a Lycoming manual that states 460 is the absolute hottest CHTs should ever be. I've had the same high temps on my 0-320 E2D #3 during hard climbs. Never higher than 435, but I like to keep it below 400 and can easily do that in cruise or by step climbing carefully.
Dave Anders has done extensive work regarding this. One of the main issues here is the inside-the-cowl downstream air flow. I have my heater muff and scat tubing blocking clean exit flow out of the cowl. I will soon clean this up and expect good results from that.
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