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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] As usual Al and Daniele have it right. And I think you too Bob, it's quite possible some water could blow out especially with the butterflys open. As far as I can tell the mufflers filled up quite a bit with water. On PT 103-145 and 147-162 the water cooling jacket on the exhaust pipes ended before the transom. Thus the need for the separate jumper pipes. PT 103-138 had slightly different ones than 139-145 and 147-162's. PT 146 and 163 on carried the water jacketed exhaust pipes through the transom so there was no need for the external pipes. The mufflers were mostly copper and bronze. From what I can tell the water went through a jacketed exhaust tube that housed the butterfly valve and into a water jacket attached to the side of the muffler. Then it passed through holes at the bottom of the jacket and into the exhaust inlet tube inside the muffler that had holes drilled at the bottom. Then the mix of water and exhaust (when the butterflys were closed) went up through the muffler body and out of the exhaust outlet tube that had holes drilled in the top. Here's a view of a typical exhaust pipe section from Dick's Elco drawings. All the pipes were jacketed Bill, at least on the 80's. Interesting treatment of the surfaces exposed to salt water: [image]http://www.pt103.com/images/asst/DwgElco80_Exhaust_Pipe_Construction.jpg[/image] [EndQuote]
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