by hilltop170 » Fri Aug 05, 2022 6:54 pm
Richgj3 wrote:You will notice in the picture posted in the thread about baffles by hilltop170 that the firewall cabin heat fitting/control is a later style than 1952. The scat tubes look like 2 inch but I can’t be sure.
I had a complete C180 heater system installed in my 1951 170A on a 337 Field Approval here in Alaska. The only exception was we used 2" scat from the engine to the heat control valve because we did not want to modify the exhaust system. Also, the motor mount restricted access to the control valve on the cold air/top side.
The 3" connections on the 180 control valve were necked-down but even with the 2" scat, there is adequate heat and cold air available in the cabin with the two outlets in the firewall header and outlets in the side panels at the door posts directing air to the back seats.
p.s. For the detail oriented folks, Del Lehman later installed the guillotine shut-off valve that was omitted in the original control valve installation shown.

- C180 heater control valve with 2” scat
Last edited by
hilltop170 on Sat Aug 06, 2022 5:48 pm, edited 2 times in total.
Richard Pulley
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!