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PT Boat Forum
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Jeff D
The PT Boat Forum
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PT Boats of WWII
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PT Boats - General
Post a reply to: ELCO 80' mufflers
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[StartQuote] Bob, I am not in a place where I can review references, but from memory I make the following comments: The exhaust manifolds would have been cooled by circulating in an external jacket to the manifold. This would keep water out of the cylinders. The manifold is part of the engine and an expensive casting. While the exhaust pipes which bolt to the manifold are simple extrusions, an inexpensive part. The exhaust was cooled by direct injection of sea water into the exhaust. One of the byproducts of combustion is H2O, basically distilled water. This water would have diluted the salt content of the injected sea water, reducing the corrosive aspects of the sea water. I seem to recall the exhaust pipes were stainless steel which is resistant to salt corrosion, but I would need to validate the pipe material. All of the water exits with the exhaust, which is the spray you referenced in the photographs. None of this water would have gone into the mufflers, which were probably cooled by their direct immersion in the sea. As for the piping, I recall seeing this and having the same question as you. I do not recall what I determined as the function. When I get back to references I will have to take a look again. Cooling of mechanical devices is interesting design work. Some of the techniques used seem odd at first glance, but as you dig and understand the concepts/materials used it all makes sense from a mechanical design perspective. We all have to keep in mind the intended longevity of the device is also a factor. We have to remember that PT boats were not intended to have a long life. Corrosion by salt water over a long period of time would probably have been considered acceptable design tradeoff to weight and cost. Bill Bill Smallshaw[EndQuote]
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