Lift Muffler Or Simply Go Below and Above DWL?

Designs for inboard or outboard power

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Jones
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Joined: Mon Nov 17, 2003 11:22 am
Location: Idaho

Lift Muffler Or Simply Go Below and Above DWL?

Postby Jones » Thu May 03, 2007 11:32 am

Hello and long time since I've posted, I've been very busy completing the Bo Jest.

Question: My exhaust riser is located 14" above designated water line (DWL) and the deck supports you see in the picture below are just about water level. I'm planning on going straight down below deck so the exhaust can fill with raw water then be pushed upward to a point just above DWL at the transom, basically duplicating the effect of a lift-type muffler w/o the hassles. See any possible problems with this idea?

Image

Hmm... not sure why the pic doesn't show, the location addy shows good :?:

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Bill Edmundson
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Postby Bill Edmundson » Thu May 03, 2007 12:07 pm

Looks like a Yanmar to me!

I'm not completely sure I'm clear on what you're saying. But, my exaust will not be all above the waterline either. So, I'm hoping for the lift effect also.

I can't get the picture to post. But, I cut and pasted it in the browser.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

Jones
Posts: 81
Joined: Mon Nov 17, 2003 11:22 am
Location: Idaho

Postby Jones » Thu May 03, 2007 1:55 pm

Bill Edmundson wrote:Looks like a Yanmar to me!

I'm not completely sure I'm clear on what you're saying. But, my exaust will not be all above the waterline either. So, I'm hoping for the lift effect also.

I can't get the picture to post. But, I cut and pasted it in the browser.

Bill


It must exceed the size limit, if there is one.

Detailed explanation:

1) The output from the exhaust riser sits 14" above water.
2) The intended final exhaust point sits about at water line.
3) Routing would go from 14" above water to about 4" below water and then exit about level with water... in theory this should protect the engine from flooding and still form a "pool" so the exhaust is cooled and quieted and would be dumped every time the boat is hauled out.

I'm basically ready to go with my plan, just thought I'd bounce it here and see if anyone saw glaring fault.

Thanks.

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woodruff
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Postby woodruff » Thu May 03, 2007 8:00 pm

Your photo won't post because it's not a direct .jpg. You have extra code that photobucket uses and this forum can't use it. I copied your photo and reduced it's size for better viewing.

Image


Link to full size image: http://inertext.homeunix.com/thumbs/%20bojest.jpg

woodruff

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woodruff
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Postby woodruff » Thu May 03, 2007 8:03 pm



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