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Old 04-14-2015, 03:17 PM   #1
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Exhaust extension

The transom exhaust pipe exits about 2 " out from transom. I want to extend it so the diesel exhaust smoke doesn't blacken transom.Part of the problem is the dinghy attached to transom via weaver davits. The smoke bellows up/around leaving the transom darkened. Question is : To what limit can I the exhaust pipe without restriction of exhaust and water flow? Ideas? Thanks David
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Old 04-14-2015, 03:48 PM   #2
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I think you are going to find that the exhaust gasses are sucked back toward the transom when underway and no minor extension of the tailpipe is going to completely solve your issue.
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Old 04-14-2015, 04:05 PM   #3
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I have seen extensions up to about 6 inches. Some use a 45 at the end to get the flow out from the back of the boat. I have seen that on a Mainship and the owner said it worked.
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Old 04-14-2015, 04:42 PM   #4
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There is a boat next to me at the yard that has a 2 foot extension. I noticed it right away. Not advocating it but apparently it works for him.
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Old 04-14-2015, 04:49 PM   #5
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Salisbury made a rubber type elbow that routed the exhaust into the water. I believe it was called the Salisbury Hydo-vac silencer. It worked as a muffler and put the stinky exhaust into the water. There were a few holes in it just above the water line probably to let the engine idle and reduce the chance of a hydro-lock. I installed one many years ago it worked great. I have since seen some home made ones by clamping a rubber elbow to the exhaust tube to put the exhaust into the water. I hope those home made ones remembered to drill a few holes above the water line.
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Old 04-14-2015, 08:11 PM   #6
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Here's Hobo's extension. The bell end of a piece of PVC, about 2'. total.
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Old 04-14-2015, 08:36 PM   #7
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Quote:
Originally Posted by Larry M View Post
Here's Hobo's extension. The bell end of a piece of PVC, about 2'. total.

We have the same set up. It extends almost to the end of the swim platform.


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Old 04-14-2015, 09:50 PM   #8
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Quote:
Originally Posted by Larry M View Post
Here's Hobo's extension. The bell end of a piece of PVC, about 2'. total.
thanks .photo answered question ..no problem with "back pressure" adding 12 " extension..thanks to all.
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Old 04-15-2015, 04:26 PM   #9
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An extension like that will not affect backpressure
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Old 04-26-2015, 10:00 PM   #10
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The boat I was referring to in the earlier post.
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