> > > >anyone have experience with installing cabin heaters using a shroud >around the exhaust pipes? > >Trevor Norman > >_+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
My carb heat is nearly identical to Mark's and is pretty much an industry standard. Some designs close the shroud and run ram air to the shroud which is dumped when not used for carb heat. https://dl.dropboxusercontent.com/u/32133949/IMG_8087.jpg My cabin heat is similar but I do not recommend my exact setup. https://dl.dropboxusercontent.com/u/32133949/IMG_8090.jpg It should have a sealed shroud and have fresh ram air to the shroud. My setup introduces the possibility of carbon monoxide entering the cabin if an exhaust leak should occur. I'm comfortable with the setup for now for two reasons. I use cabin heat very, very little and then only for short durations at very cold temperatures. Second, my exhaust is all new stainless steel with new gaskets and I have a carbon monoxide detector patch on the panel. But, like I said, I don't recommend this as the right way to do it. I use a small fan on the back side of the firewall to blow in hot air when I open the cabin heat door on the firewall. I may break down this winter and close the shroud and add fresh ram air. I flew for 6 or 7 years in temps down to 15 to 20 degrees F with no cabin heat at all. KR fliers are a tough crowd but do it right to eliminate all possible concerns. Larry Flesner
