Loud Exhaust on Take Off
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=18152
Printed Date: November-18-2024 at 3:36pm
Topic: Loud Exhaust on Take Off
Posted By: davehurwitz
Subject: Loud Exhaust on Take Off
Date Posted: 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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Replies:
Posted By: 79nautique
Date Posted: June-23-2010 at 11:40am
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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http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique
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Posted By: davehurwitz
Date 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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Posted By: TRBenj
Date Posted: June-23-2010 at 1:40pm
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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