Note: I'm not a mechanic - this is just picked-up as an interested pilot stuff:
I've heard it said you should never disconnect the feed tube to the cabin heat shroud that's around the exhaust pipe - without the cooling air blast, the exhaust pipe will melt. If you bypass the cabin heat, I think it's important to remove the shroud from around the exhaust pipe/muffler and plug the opening in the baffle. People who do use cabin heat for part of the year (or all year if they fly high) should only disconnect the hose that goes from the shroud to the firewall. I've seen this hose disconnected from the firewall and stuck down into the spacing between the side cowl and the fuselage so it exhausts the hot air out of the engine compartment. Don't ye melt thine exhaust pipe! Ed Ed Burkhead http://edburkhead/Ercoupe/index.htm ed -at- edburkh???ead . com (change -at- to @ and remove ??? and spaces)
