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PT Boats of WWII
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PT Boats - General
Post a reply to: 305 emgine #2
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[StartQuote] Hey Randy, Sounds like you figured out the problems with the dyno from last time. In looking at those cherry red exhaust pipes, it reminded me of when we suffered the same exact problems with those exhaust pipes getting so hot. To fix the problem, we had a total of 6 of those water cooled exhaust pipes custom made -2 to fit each engine. I have read several examples (from the wartime diary of RON13) of Higgins Boats "blowing out an exhaust stack" and having to replace them because a steam bubble formed inside the cooling passages and prevented water flow, which in turn melted the internal copper exhaust pipe. I can see how this might happen when the melting point of copper is not too far from the temperature of those flames coming out of the exhaust manifold during operation. I also found the startup procedure makes sure to check the cooling water inside the stacks is primed before operation and also drained after shutting them down to prevent the formation of steam bubbles inside the pipes. I wonder just how hot that pipe got? Pretty cool picture I must admit. Good luck on the rest of your tests! Jerry Gilmartin PT658 Crewman Portland OR[EndQuote]
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