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Loud Exhaust on Take Off |
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davehurwitz 
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Joined: June-23-2010 Status: Offline Points: 2 |
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 Topic: Loud Exhaust on Take OffPosted: June-23-2010 at 2:39am |
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Hi, my 2004 SN exhaust is loud on take off but it goes away after a few seconds. No overheating and I replaced impeller. No water in bilge from drain plug missing from muffler. Any ideas?
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: June-23-2010 at 11:40am |
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it's called harmonics nothing to worry about, the tone is lower at take off then increases in pitch as the engine's rpms come up.
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davehurwitz
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Posted: June-23-2010 at 1:13pm |
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It's definitely more than a different tone--sounds like the impleller isn't pumping water and exhaust is dry but as I said, no overheating and I changed the impeller.
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21186 |
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Posted: June-23-2010 at 1:40pm |
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If the impeller isnt pumping water, you wont know it unless the temp gauge goes up- you certainly wont hear it.
I suspect youre hearing an echo effect on takeoff. The large wake thats produced at a slow (just on plane) speed, combined with a slightly more bow-up position causes some sound reflection. Ive noticed this on every inboard Ive ever driven. |
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