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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
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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?
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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.
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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/
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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.
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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