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  #1  
Old 02-24-2006, 10:50 PM
Ted Farmin Ted Farmin is offline
 
Join Date: Mar 2005
Location: Sandpoint, Idaho
Posts: 104
Default Carb heat

Living in North Idaho I am concerned about carb ice as our temp. is usually
about the optimum 60* (LOL) anyway I have Van's tube carb. heater and
it doesn't look like it will provide much heat. Also it seems that I have read
where that unit doesn't do a very good job. Has anyone used this while monitoring
carb. temp and if so what temps have you indicated. For those of you that
have the same feeling that I have what have you done for a carb. heat muff.
Ted
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  #2  
Old 02-24-2006, 11:22 PM
painless painless is offline
 
Join Date: Jan 2005
Location: Peshtigo, Wisconsin
Posts: 768
Default

Ted:

I shared your concern regarding the efficiency of the carb heat muff as supplied from Van's.

I changed mine out to one that I got from Wicks. Part number EC100-020. Was very easy to install.


Regards,
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RV6A N782P
Peshtigo, WI
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  #3  
Old 02-25-2006, 08:32 AM
vlittle's Avatar
vlittle vlittle is offline
 
Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,251
Default

I, too am using the Wicks heat muff (15 minute install).

My testing has shown a 5 to 10 degree temperature rise when carb heat (induction heat) is selected.

In general, I don't need it much, but yesterday at 9500 feet I got a carb temp alarm, and the applied carb heat. OAT was about 6 degrees F. Other pilots were reporting rime icing in cloud at similar altitudes.

Temperature rose immediately by about 10 degrees.

Is this enough? It was for me in this situation, but who knows? The way the induction heating system works in the RV's is a lot different than certified aircraft.

Just make sure you have a carb temp probe.
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  #4  
Old 02-25-2006, 03:38 PM
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n468ac n468ac is offline
 
Join Date: Jun 2005
Location: C09 - Morris
Posts: 579
Default

Quote:
Originally Posted by vlittle
I, too am using the Wicks heat muff (15 minute install).

My testing has shown a 5 to 10 degree temperature rise when carb heat (induction heat) is selected.

In general, I don't need it much, but yesterday at 9500 feet I got a carb temp alarm, and the applied carb heat. OAT was about 6 degrees F. Other pilots were reporting rime icing in cloud at similar altitudes.

Temperature rose immediately by about 10 degrees.

Is this enough? It was for me in this situation, but who knows? The way the induction heating system works in the RV's is a lot different than certified aircraft.

Just make sure you have a carb temp probe.

certified aircraft need to have a 90deg rise when carb heat applied. We too are looking for a good carb heat source.
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(This post by: Christopher Checca EAA Lifetime Member #799388)

Allen Checca (father)
Christopher Checca (son)

RV-6A - N468AC
ENGINE: Lycoming 180 HP O-360-A1A
PROPELLER: Senisentch 72FM859-1-85
WEIGHT: Empty Aircraft 1152 lbs
BASED: KC09 - Morris, IL.
Flying since June 6, 2005
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  #5  
Old 02-25-2006, 04:03 PM
jhallrv4 jhallrv4 is offline
 
Join Date: Jan 2005
Location: Fort Collins, Colorado
Posts: 137
Default

I have the Van's muff on my -4...forget it. I also have a carb temp probe and it verifies what I suspected when I installed the thing. Maybe a 1 degree rise.

Find another option and don't waste your time and money on the cheapo.

Jeff
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  #6  
Old 02-25-2006, 08:15 PM
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gmcjetpilot gmcjetpilot is offline
 
Join Date: Jan 2005
Posts: 4,285
Default Hot and cold.

Quote:
Originally Posted by jhallrv4
I have the Van's muff on my -4...forget it. I also have a carb temp probe and it verifies what I suspected when I installed the thing. Maybe a 1 degree rise.

Find another option and don't waste your time and money on the cheapo.

Jeff
One degree!!! ONE that sucks Is that with just sucking air from cowl or is that with the stove pipe riser off the cross over pipe?


Quote:
Originally Posted by vlittle
I, too am using the Wicks heat muff (15 minute install).

My testing has shown a 5 to 10 degree temperature rise when carb heat (induction heat) is selected.

In general, I don't need it much, but yesterday at 9500 feet I got a carb temp alarm, and the applied carb heat. OAT was about 6 degrees F. Other pilots were reporting rime icing in cloud at similar altitudes.

Temperature rose immediately by about 10 degrees.

Is this enough? It was for me in this situation, but who knows? The way the induction heating system works in the RV's is a lot different than certified aircraft.

Just make sure you have a carb temp probe.
Agree a Carb Air Temp gauge is a good thing. I am a little dissapointed, 10F rise sounds low. I firgure at min you might like 40F to 60F or more, but the good news is: one) it was 6F outside, two) the chance of carb ice at 6F, outside visable mosture, is slim. Real cold conditions below 30F, especially below 20F, is less prone to carb ice, because there's less mosture held in cold air. Your muff has to be better than Van's, even at 10F. Production planes I recall have large heat muffs and usually wrap around two pipes or are part of the muffler system.

If you want REAL carb heat, besides using a large heat muff, you can improve the heat available with Aircraft Exhaust technologies heat studs. They weld studs onto any 321 SS pipe. In fact they will make a whole custom heat muff if you like. They have complete exhaust systems as well. http://www.aircraftexhaust.net/

Quote:
Originally Posted by n468ac
certified aircraft need to have a 90deg rise when carb heat applied. We too are looking for a good carb heat source.
Correct 90F rise at 75% power per FAR part 23.1093. There is a thread on the JamesAircraft yahoo group on carb ice and Van's heat right now.
http://groups.yahoo.com/group/JamesAircraft/

You can use anti-ice aditives in the fuel:
http://www.sacskyranch.com/crbice.htm

George

Last edited by gmcjetpilot : 02-25-2006 at 08:40 PM.
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  #7  
Old 02-26-2006, 11:35 AM
Gerald Clabots Gerald Clabots is offline
 
Join Date: Feb 2005
Location: Green Bay WI
Posts: 89
Default Carb Heat

Try this web site , Rick makes a heat muff for RV's. I purchased mine from him.
http://robbinswings.com/

Gerry 7A Getting close
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