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rveighta(at)earthlink.net
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 Posted: Mon May 22, 2006 5:38 am Post subject: Engine Problem |
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All, I have a friend who was recently flying a photo shoot at 9500' in a Cessna
when the engine began running rough. He quickly pulled carb heat and
the engine began running normally, but as soon as he pushed in the carb heat
control, the engine began running rough again.
As he descended to around 4000' feet, the engine began running fine without
using carb heat. Disassembly of the carb has revealed no problem. Any ideas
about what could be the cause? Carb Ice, maybe?
Walt Shipley
Do Not Archive
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ronlee(at)pcisys.net
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| Posted: Mon May 22, 2006 6:09 am Post subject: Engine Problem |
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Did he lean the mixture during the climb?
Ron Lee
Do not archive
| Quote: | All, I have a friend who was recently flying a photo shoot at 9500' in a
Cessna
when the engine began running rough. He quickly pulled carb heat and
the engine began running normally, but as soon as he pushed in the carb heat
control, the engine began running rough again.
As he descended to around 4000' feet, the engine began running fine without
using carb heat. Disassembly of the carb has revealed no problem. Any ideas
about what could be the cause? Carb Ice, maybe?
|
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pitts_pilot(at)bellsouth.
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| Posted: Mon May 22, 2006 6:46 am Post subject: Engine Problem |
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rveighta wrote:
| Quote: |
All, I have a friend who was recently flying a photo shoot at 9500' in a Cessna
when the engine began running rough. He quickly pulled carb heat and
the engine began running normally, but as soon as he pushed in the carb heat
control, the engine began running rough again.
As he descended to around 4000' feet, the engine began running fine without
using carb heat. Disassembly of the carb has revealed no problem. Any ideas
about what could be the cause? Carb Ice, maybe?
Walt Shipley
Do Not Archive
Does sound like carb ice. A lot of folks don't leave the carb heat on
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long enough to melt the ice. Depending on the conditions and how well
carb hear works ..... it may take quite a while.
Linn
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klwerner(at)comcast.net
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| Posted: Mon May 22, 2006 7:09 am Post subject: Engine Problem |
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Dear Walt,
What was the weather like that day? What was the temperature & humidity
at 9500' MSL?
Did your friend properly lean out the engine as Ron asked already, as it
sounds like a to rich a mixture problem?
DEW KNOT ARKYVE
(as the same is already embedded below)
---
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low pass
Joined: 10 Jan 2006
Posts: 32
Location: Houston
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| Posted: Mon May 22, 2006 7:17 am Post subject: Re: Engine Problem |
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Flying a photo flight, your buddy was probably at a reduced power setting which could make the icing more probable. If the ice cleared up while decending through 4000' or so, then I would imagine he flew into warmer and/or dryer air.
I used to have a link to a handy-dandy carb ice chart which plotted % power, RH and OAT. As I recall, the most severe icing occurred in the 70-75-F range (at high humidity and reduced power of course). But showed moderate icing could occur as low as 10 F and up to 100 F when RH is 100 to 30%, respectively.
Found a link to a chart similar to the one I remember.
http://www.aopa.org/images/asf/ePilot/nyc02fa025_1.jpg
As for being too lean, could be. But adding carb heat will aggravate (sp?) the problem if too rich. Heated (less dense) air will serve to further enrich the mixture. Says the carb heat relieved the roughness.
In my experience, carb heat can offer very quick response sometimes.
I'd bet your friend iced up the carburetor.
2 cents
Bryan Jones -8
Houston, Texas
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joplin1(at)charter.net
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| Posted: Mon May 22, 2006 8:11 am Post subject: Engine Problem |
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I had the reverse happen in a Globe Swift many years ago. When the
engine started running rough, I pulled the Carb Heat full On and the
engine stopped cold. I quickly pushed the Carb Heat OFF and the engine
restarted but continued to run rough. I discovered that I had not
leaned properly and was running too rich. Carb Heat made it run even
richer and flooded the engine. Leaning properly solved the problem.
Maybe his problem is just the opposite. If he over leaned on climb out,
his leanest cylinders may have started cutting out. Applying Carb Heat
richened it up. Sucking hot air into the induction system will cause it
to run richer. He might want to check that his Carb Air Box is closing
fully. If any hot air is getting past it, he's probably leaning
excessively to compensate for it. A leaking primer system can also
cause a mixture problem.
---
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truflite(at)yahoo.com
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| Posted: Mon May 22, 2006 1:20 pm Post subject: Engine Problem |
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Check this page out, it may help.
Dave
http://ibis.experimentals.de/images/carbicingfromcaassl14.gif
--- rveighta <rveighta(at)earthlink.net> wrote:
| Quote: |
<rveighta(at)earthlink.net>
All, I have a friend who was recently flying a photo
shoot at 9500' in a Cessna
when the engine began running rough. He quickly
pulled carb heat and
the engine began running normally, but as soon as he
pushed in the carb heat
control, the engine began running rough again.
As he descended to around 4000' feet, the engine
began running fine without
using carb heat. Disassembly of the carb has
revealed no problem. Any ideas
about what could be the cause? Carb Ice, maybe?
Walt Shipley
Do Not Archive
browse
Subscriptions page,
FAQ,
Admin.
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ghinman(at)mts.net
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| Posted: Tue May 23, 2006 7:13 am Post subject: Engine Problem |
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Go to this site
http://www.tc.gc.ca/CivilAviation/publications/tp14371/AIR/2-1.htm#2-3
scroll down to the carb ice chart and compare it to the temp and dew
point on that day.
| Quote: | All, I have a friend who was recently flying a photo shoot at 9500' in a Cessna
when the engine began running rough. He quickly pulled carb heat and
the engine began running normally, but as soon as he pushed in the carb heat
control, the engine began running rough again.
As he descended to around 4000' feet, the engine began running fine without
using carb heat. Disassembly of the carb has revealed no problem. Any ideas
about what could be the cause? Carb Ice, maybe?
Walt Shipley
|
--
George H. Inman
ghinman(at)mts.net
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lifeofreiley2003(at)yahoo
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| Posted: Tue May 23, 2006 7:53 am Post subject: Engine Problem |
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George,
Thanks! That's is very good information for every pilot to read.
Darrell
do not archive
George Inman 204 287 8334 <ghinman(at)mts.net> wrote:
Go to this site
http://www.tc.gc.ca/CivilAviation/publications/tp14371/AIR/2-1.htm#2-3
scroll down to the carb ice chart and compare it to the temp and dew
point on that day.
| Quote: | All, I have a friend who was recently flying a photo shoot at 9500' in a Cessna
when the engine began running rough. He quickly pulled carb heat and
the engine began running normally, but as soon as he pushed in the carb heat
control, the engine began running rough again.
As he descended to around 4000' feet, the engine began running fine without
using carb heat. Disassembly of the carb has revealed no problem. Any ideas
about what could be the cause? Carb Ice, maybe?
Walt Shipley
|
--
George H. Inman
ghinman(at)mts.net
---------------------------------
Blab-away for as little as 1/min. Make PC-to-Phone Calls using Yahoo! Messenger with Voice.
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