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Dennis.Kirby(at)kirtland.
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 Posted: Mon Dec 22, 2008 12:16 pm Post subject: 912 Carb Heat |
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<Classification: UNCLASSIFIED
< I paid 385.00 for a hot water carb heat system which included the covers. I
flew with the carb heat system for a few years, then uninstalled everything
except the filter covers. john h >>
John –
I’m curious: why didn’t you want to keep that carb heat system on your 912?
I’m undecided on the decision to get one or not for my 912ul. On a few occasions flying my Mark-3 in likely-carb-ice conditions (humid air, 60-degree temps), I’ve detected my engine give a brief falter in RPM, which is a sign of the carbs shedding a bit of ice that just formed. Really gets your attention.
I’ve seen ‘em advertised through Lockwood, and I thought having a carb ice prevention system on my engine might add safety. True?
Dennis Kirby
“Magic Bike,” N93DK in
Cedar Crest, NM
Classification: UNCLASSIFIED
[quote][b]
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Mon Dec 22, 2008 1:41 pm Post subject: 912 Carb Heat |
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Dennis:
I bought and installed the carb heat system, hot water, after encountering carb ice on a flight to Alaska in 2000. On my approach to Toad River, BC, I lost the engine, at idle, just prior to touch down. I already had the field made, so no problem there. Another reminder to shoot the approach to make the field if the engine quits on final. Norm Labhardt did not do that. A lot of other pilots have not done that and have paid the price.
Soon as I rolled out and stopped, I hit the starter and the engine would not start with the throttle at normal position for starting, closed. I opened the throttle some and the engine then started. It ran perfect above 3,000 rpm, but would shut down as soon as I let the rpm drop below 3,000. I taxiied back to the east end of the strip and shut her down. Walked across the Alaska Highway, got a cup of coffee, walked back to the airplane and again tried to crank it. This is about 20 minutes later. Engine fired right up and idled like a Singer sewing machine. Problem was the idle jet iced up. I gave the ice time to melt and the engine was running normal again.
I installed the carb heat system prior to my Alaska flight in 2001. Used it for several years. Never did like it because of the hot water system tapping into the coolant line, plus piping hot water into the cockpit area for the control valve. Do not really know how effective it was. Never had an icing problem except the one time in Canada, and have never had an icing problem since then. The Bing carbs on the 912 series engines are not prone to icing problems. I do not consider icing up an idle jet, once, in more than 2,500 912 hours a problem. Never heard of another 912 being put down because of carb ice.
The plumbing set caused wear on the K&N air filters and probably restricted airflow somewhat. There was also tghe chance of the soft aluminum tubing coiled around the air filters failing and losing coolant and creating a forced landing situation.
I don't have a carb ice problem in the high humidity environment I live in. I doubt you would ever have a problem in NM.
Based on where, and the hours, I have flown the 912 engines, since 1994, I figure I don't need carb heat.
john h
mkIII - Getting ready for Monument Valley 2009. 
[quote]
I’m curious: why didn’t you want to keep that carb heat system on your 912?
Dennis Kirby
[b]
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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zeprep251(at)aol.com
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| Posted: Tue Dec 23, 2008 5:53 am Post subject: 912 Carb Heat |
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Being in Ohio gives me lots of carb icing weather.Never had the bing 64 ice completely but it got rough running at cruise rpm. I went with the electric 2 stage heater that bolts to the throttle shaft casting area.Works very well,and is small enough to not interfere with most installations.
G.Aman MK-3C Jabiru 2200
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