The Cessna 120-140 Association Forum

Any tips to make my heater work any better. Warm air gets just inside the firewall then kinda disappears!
Thanks

What exhaust system do you have? Patch up all the holes and leaks in the heat muff, make sure you have good ram air pressure going into the muff, and stop all the cold air from coming into the cabin.

Thanks John,
I have the 150 exhaust. Didn’t really think about it leaking around the shroud I will have to check that out. Cabin is pretty good at this point, doors are reall good, maybe a little leaking in the top corners of the windshield. I have the vent holes in the wings blocked off so not much coming through the vents. Just need to work on getting a little flow out of the warm air.

A recent new member bought a 46 140. Sometime in the aircraft's dim dark past, the exhaust was upgraded to the C-150 exhaust. They also installed the standard heat shroud around the muffler from a later 150 which has a 3" scatt outlet to the cabin, as opposed to the standard 2" that comes on all the 120/140 aircraft. (you need a matching inlet riveted to the firewall of 3" flange so the larger scatt will work) So of course they riveted a larger heat valve/flange to the fire wall.

Bottom line, the member had flown in my aircraft (standard 2" configuration) and while we didn't freeze while flying in 40 degree OAT's, we weren't exactly cozy warm.

With his new airplane they had not only adequate heat, but surplus heat with OAT's in the 30's. This is an option if you want to work out the details of getting the larger scatt worked out with your A&P.

Between sealing any heat loss and cold air entering the cabin and this mod, you would never be cold again. (except on start up!!!

Thanks for the heads up on the 3” hose. I will check that out along with making sure I have eliminated as many leaks as possible.
Also here in Wyoming warmer weather is only 90 days away.

Victors not stretching the truth! I ﹰswear you could bake cookies with that thing! Ok well thats stretching it but yea theres plenty of heat even with numerous anti-CO features of the cabin!

In fact on the 120 / 140 club fb page a gent posted about his doors sucking out a bit at the backside upper area making it really cold. I thought " glad mine dont do that" i looked next time out and well by God i do have that same issue...

Im really happy someone set it up like this, makes winter flying much more pleasant!