Wet Exhaust thoughts

Designs for inboard or outboard power

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Trackhappy
Posts: 1412
Joined: Wed Feb 17, 2010 5:42 pm
Location: Sunshine Coast, Queensland, Australia. Building Gentry.

Re: Wet Exhaust thoughts

Post by Trackhappy »

I would not go inside the pipe, you already have a very small outlet and that would restrict it even more. Me, I'd get some new outlets made slightly bigger with some parallel pipe poking out to which you can attach elbows as required. That way you could change them if they got damaged, or change the angle to fine tune things.
By the time I have built a boat, I'll be ready to build a boat....

bob smith
Posts: 489
Joined: Thu Aug 21, 2008 6:59 am
Location: Chester, SC

Re: Wet Exhaust thoughts

Post by bob smith »

IMHO:
Spring for some new exhaust tips that are sized to your exhaust risers and extend a couple of inches from the transom.
"All your wildest dreams will come true"
Pedro
(Napoleon Dynamite)
Bob Smith
Chester, SC

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kens
Posts: 4781
Joined: Wed Nov 12, 2003 5:25 pm
Location: Coastal Georgia

Re: Wet Exhaust thoughts

Post by kens »

Whatever size the exhaust manifold elbow, is the size to run all the way.
So, if your elbow is 3 1/2", then you need to run 3 1/2" minimum all the way to transom and out the tips.

This might be your performance issue with a restricted exhaust,, high back pressure.
Remember that wet exhaust not only carries engine exhaust, but, must carry all the cooling water also.
Marine exhaust always looks bigger than automotive exhaust. Marine engines typically run higher power longer periods of time, and dump all the cooling water into the exhaust as well. The exhaust run has to accommodate all this.
Oak is over rated, everything about it takes extra time; then it warps, splits or checks !!! :roll:

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