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I had my exhaust pipes ceramic coated. I told the coaters to not coat the carb/cabin heat muff area. They did anyway.
I don't remember how much the temperature rose before the coating but now it only raises about 10°F according to my carb heat temp gauge. I have packed the carb heat muff with stainless steel brillo pads so that I can pick up as much heat as possible. I still have a few boxes left if needed.
In 10 years of flying the plane, I have had carb ice 3 or 4 times. Although I don't feel comfortable with it, my carb heater was able to remove the ice when needed.
I flew in a Gruman Tiger last year that had a carb temp gauge. When we pulled the carb heat, the temp increased just about 10°F. Go figure.
Lorn
From: Bill Hannahan <wfhannahan@yahoo.com>
Date: November 23, 2008 9:30:14 AM GMT-05:00
Carb ice comes in a wide range of severity. The FAA requires 100 deg F rise for certification.
Regards,
Bill Hannahan
From: Larry Henney <LHenney@charter.net>
Date: Friday, November 21, 2008, 4:27 PM
Guys,
I've got a friend looking at his 320 carb heat intake box. The question is; Does lower cowl air have enough heat in it to prevent carb ice? He is considering muffing an exhaust pipe to make sure the heated air is adequately hot.
I was wondering if others have ever had carb ice with the standard Lancair carb heat box (using just lower cowl hot (warm) air)?
We'd appreciate your thoughts.
Larry Henney
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,498 hrs, N31161, Y47, SE Michigan
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