Re: exhaust tailpipes
Posted: Mon Jan 05, 2015 11:29 am
I apologize for being slow to respond to this thread (re: aluminum muffler seals), but I've been really busy during the Holiday. (Hope everyone's was happy!).
The seals are a made of heavy-wall S-0 (soft) aluminum tubing, and can be fabricated using a cross-cut with a hole-saw to provide the "wavy" shape. They don't do much except to support the shrouds and reduce heat-losses. Good substitutes might be made out of heat-resistant cloth-tubing such as used for automotive heat-riser/choke-riser and wire-harness insulation. Simply cut it to length and loop it into a circle/doughnut and use Hi-temp RTV or a short piece of alum-tube to mate the ends into/make a circle. This won't support the shroud as much as the OEM part but will help retain the cabin/carb heat pressures inside the shroud.
Fresh air entering the shroud provides a high-pressure area in there and prevents the small leaks from the system clamps from entering the cabin heat air. Those tailpipe clamps are unlikely to be the source of CO entering the cabin. (The cylinder-exhaust-riser clamps are another matter....they should be sealed as well as possible with muffler-tape to prevent high oil temps, and have been discussed elsewhere in these forums.)
Hope this helps.
The seals are a made of heavy-wall S-0 (soft) aluminum tubing, and can be fabricated using a cross-cut with a hole-saw to provide the "wavy" shape. They don't do much except to support the shrouds and reduce heat-losses. Good substitutes might be made out of heat-resistant cloth-tubing such as used for automotive heat-riser/choke-riser and wire-harness insulation. Simply cut it to length and loop it into a circle/doughnut and use Hi-temp RTV or a short piece of alum-tube to mate the ends into/make a circle. This won't support the shroud as much as the OEM part but will help retain the cabin/carb heat pressures inside the shroud.
Fresh air entering the shroud provides a high-pressure area in there and prevents the small leaks from the system clamps from entering the cabin heat air. Those tailpipe clamps are unlikely to be the source of CO entering the cabin. (The cylinder-exhaust-riser clamps are another matter....they should be sealed as well as possible with muffler-tape to prevent high oil temps, and have been discussed elsewhere in these forums.)
Hope this helps.
Guess if I make any changes to my system I will be getting more details from George regarding how to make my own (owner produced parts).