Heater Questions

djbaker · Post by **djbaker** » Wed Dec 12, 2007 12:28 am

In my 49A model I have the heater that runs into the flap handle tube. The heat seems to be directed to the pilots feet first, then to the passenger, then to the rear. By the time heat gets to the rear it's anemic and we tell the rear passenger to put their hands up against the vent and BELIEVE. It actually works quite well until the temp gets to about 10F, then we use the blankets.

markeg1964 · Post by **markeg1964** » Wed Dec 12, 2007 2:10 am

Gahorn,

I was forced to replace my exhaust last year during the annual and found the current system here on the forum. It does work better than the original 1950 system. Iâ€™ll keep your suggestion in mind although so far my family seems happy and we only use full heat when it is below freezing.

Mark

cessna170bdriver · Post by **cessna170bdriver** » Wed Dec 12, 2007 4:18 am

A '55B heater for comparison. The butterfly valve on the firewall selects either fresh air from the rear baffle or heat from the right muffler. There is also a slider valve right behind the butterfly that can isolate the cabin from the cowled area in case of engine fire. This setup once kept the cockpit in 40's at minus 20 OAT.

Miles

hilltop170 · Post by **hilltop170** » Wed Dec 12, 2007 5:58 am

Miles-
I really like the 3" scat hose. That should flow plenty of air.

One of the main problems with the old round heat valve on my plane was it would catch and hold water from somewhere I could never locate or stop. Then every time the heat was turned on, it would steam up the entire plane and fog up the windows. The side windows would have to be opened until all the water cooked out of the heater valve, then the windows could be closed and all would be good until the next rain. Not very comfortable in cold weather.

So that's the main reason I had the shop install a salvaged C-180 heater valve and distribution duct in my 1951 170A in place of the stock system. We left the 2" scat hose in place to simplify the installation. New pilot and co-pilot side kick panels were fabricated to include heat ducts to the rear seats. Even with only the 2" scat hose supply, the plane stays very warm, I think because of the number and placement of outlets. The defroster outlet on the distribution header was plugged off because of lack of room for the defroster outlet fixture behind the panel. Maybe someday I'll figure out how to install it but so far haven't needed it yet.

C-180 heater valve mounted where original round valve was located.

C-180 firewall heater distribution header. Notice outlets at each end that connect to rear seat ducts mounted in kick panels, outlets over pilot and co-pilot rudders, and plugged defroster outlet.

New co-pilot side kick panel with rear seat heat duct and outlet.

ak2711c · Post by **ak2711c** » Wed Dec 12, 2007 7:53 am

Mark I thought that exhaust look familiar.

I wish my new exhaust had the heat of that old one.
Shawn

markeg1964 · Post by **markeg1964** » Wed Dec 12, 2007 4:39 pm

Shawn, Thanks again! The exhaust is workiing great

Mark

hilltop170 · Post by **hilltop170** » Wed Dec 12, 2007 8:17 pm

Weren't the heater and carb heat supplies required to be split apart so that the heater could never rob the carb heat and the carb heat would always have its own source of heat?