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From: Lorn H Olsen <lorn@dynacomm.us>
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Subject: Re: 320 Carb Heat 

I had my exhaust pipes ceramic coated. I told the coaters to not coat =20=

the carb/cabin heat muff area. They did anyway.

I don't remember how much the temperature rose before the coating but =20=

now it only raises about 10=B0F according to my carb heat temp gauge. I =20=

have packed the carb heat muff with stainless steel brillo pads so =20
that I can pick up as much heat as possible. I still have a few boxes =20=

left if needed.

In 10 years of flying the plane, I have had carb ice 3 or 4 times. =20
Although I don't feel comfortable with it, my carb heater was able to =20=

remove the ice when needed.

I flew in a Gruman Tiger last year that had a carb temp gauge. When we =20=

pulled the carb heat, the temp increased just about 10=B0F. 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 =20=

> 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 =20
>> question is; Does lower cowl air have enough heat in it to prevent =20=

>> carb ice?  He is considering muffing an exhaust pipe to make sure =20
>> the heated air is adequately hot.
>>
>> I was wondering if others have ever had carb ice with the standard =20=

>> 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=