Muffler protection

[Clem Clement]

During the pandemic I try to run my cars 20 minutes a month to dry out the mufflers. Sometimes I forget.
Cai drill a drain hole in the muffler? If so, where? Is there anything I can run thru the engine that will protect the muffler innards?

[Kube]

Originally Posted by Clem Clement

During the pandemic I try to run my cars 20 minutes a month to dry out the mufflers. Sometimes I forget.
Cai drill a drain hole in the muffler? If so, where? Is there anything I can run thru the engine that will protect the muffler innards?

Clem, Ford suggested that a 1/8" diameter hole be drilled at the very bottom - rear of the muffler.

[19Fordy]

I do what Kube suggests. Works fine.

[JayChicago]

I did it too. Worked fine.
But what’s this about drying out the muffler once a month? Why would you need to do that? Would seem to me running the engine is what introduces humidity/condensation into the muffler, and then the need to get everything warm enough to burn off the condensation. I would think if engine hadn’t been run, muffler is fine as is.

[51woodie]

Clem When I bought my '46 Coupe, the muffler was rusted through in several places. When I replaced it, I drilled a 1/8" hole at each end, on the lowest point of the muffler, just inboard of the rolled flange. I know the holes are doing the job, because I find the sooty water spots right where the muffler was when I start the car and back it out of the garage.

[pistonbroke]

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Most but not all of the moisture in the exhaust these days is from Ethanol. If you can find non ethanol gas you will add many years to your exhaust systems and your cars will run so much better. Newer computerized cars can adjust and run ok on ethanol but our old rolling stock doesn't. Back in the day we never saw water pouring out of a tail pipe like nowadays. Maybe a drop or two when warming up but that was it. I run only nonethanol gas in my cars and no more black puddles on the floor or driveway.