Hole in Exhaust Pipe
Do (some) silencers on exhaust pipes have small holes drilled into them to allow water to drain out? I ask this because I've just found such a hole in the silencer of my 2 year old Mondeo. It looks far too neat, about 2mm dia, to be a rust hole and, being
so relatively new and with only 22k on the clock I wouldn't have expected it to be rust. I only noticed it when I saw water dripping out but allowing water to drain seems to be a good idea. I've never come across it before in 50 years of motoring.
Comments
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It certainly seems odd to me. IF it were intended to allow water to drain out I would hope to see a properly engineered bush and not just a hole. Probably a bit bigger than 2mm also. Surely hot/damp/corrosive exhaust gases would soon enlarge a simple hole? Or, maybe, the silencer is constructed with two 'skins' like a double-glazed window, and the tiny hole is just to allow for expansion of the air in the cavity??
(I have to say that I am impressed that the original exhaust on my diesel Mondeo is now coming up to 16 years old and still looks in perfect condition).
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Original equipment exhaust silencers, from various vehicle manufacturers, do indeed have a small hole in them. It is there, as summised, to let the water out that is part of the combustion process. They have been doing it for many years, probably at least
20, so it's not a new practice.0
