Originally Posted by mike.t
Springerdad I was implying vehicles with Cats when I said newer.
Mike - before the cat 'lights off' and starts it's job, there's going to be water vapor headed down the exhaust to the muffler, which will condense - until the cat gets hot enough, which happens pretty quick. Those cats will run at 1000 degrees or more. They have to for the catalyst to work. Once That cat lights off, you no longer have carbon monoxide, but carbon dioxide and water vapor. That hot gas is going to head down the exhaust and dry things out. Anyone with an infrared thermometer ever taken a reading of their exhast systems after a highway run? We watch egt's on our diesels,,,,,, I can see egt's of 12000 degrees on a pull with my camper regularly. All that heat goes,,,,, down the tail pipe.
EDIT - I should add that depending on engine, exhaust configuration, and muffler baffle placement, a muffler may or may not have a weep hole. Generally. The farther downstream it is, the more likely you wil. have one. Some engineer somewhere in the Big Tower decided all that.