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Exhaust wet or dry

Old 03-03-2023, 01:38 PM
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Default Exhaust wet or dry

Iím building a new boat and got 2 sets of SM riser.
Both look different.
Can someone tell me if those are wet or dry riser
and explain why?
thanks for the help

alex






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Old 03-03-2023, 01:52 PM
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They both have water hookupís so I would say wet. Not sure what extra nipple is for on second set unless thatís the water feed and itís dry to there. Looks like someone modified the tail pipe.
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Old 03-03-2023, 01:55 PM
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Hook up water hose to lower nipples and see where water comes out.
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Old 03-03-2023, 03:02 PM
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Lets see the tailpipe view - maybe they were welded shut and the other connections are for water dumps.
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Old 03-03-2023, 03:08 PM
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Both should be dry and double walled.
One without nipple will discharge water at exit of exhaust.
One with nipple on top will discharge at upper nipple (for discharge out the hullside, making it visible from cockpit). This one should also have small hole at bottom of exit to allow water to drain when shut down.
If the one set that was extended isn't double walled, then it would be considered wet .

Last edited by Velocity941; 03-03-2023 at 03:14 PM.
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Old 03-03-2023, 03:36 PM
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Thanks for the answer!

Exactly the extended one is double walled.
The one with the nipple isnít.

So if i want to make it wet, I should just ę close Ľ the nipple and on the other one remove the double walled ?

thanks !


Originally Posted by Velocity941
Both should be dry and double walled.
One without nipple will discharge water at exit of exhaust.
One with nipple on top will discharge at upper nipple (for discharge out the hullside, making it visible from cockpit). This one should also have small hole at bottom of exit to allow water to drain when shut down.
If the one set that was extended isn't double walled, then it would be considered wet .
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