Underwater Silent exhaust

Big D · Post by **Big D** » Fri Oct 08, 2010 9:55 pm

The only red flag I will pass on is if you have the clam shells in front of the exhaust outlets under the hull and you get launched down a ramp, go very slow. Have seen one of these fill both engines with water twice on same boat. I assume the shells direct the water up into the exhaust system if you launch too fast. This was with a hydraulic trailer. If you get splashed via a travel lift, you're okay.

prowlersfish · Post by **prowlersfish** » Fri Oct 08, 2010 10:06 pm

I belive you have the same risk with stern exhust

Big D · Post by **Big D** » Fri Oct 08, 2010 10:18 pm

Maybe it's just a distance thing Paul. The only setup I've seen this happen with at our marina was this particular one, twice on same boat!. And they launch a lot of boats that size down the ramp with stern exhaust. Just an FYI of what I've seen.

prowlersfish · Post by **prowlersfish** » Fri Oct 08, 2010 10:24 pm

Could be a poor design but like you said it the under water is closer to the engine. I know thats one reason the put flapper valves in Merc I/Os .

Big D · Post by **Big D** » Fri Oct 08, 2010 10:31 pm

Ya, and I thought that this design also had exhaust shutters but apparently not. It would have been smart to have them in though.

prowlersfish · Post by **prowlersfish** » Fri Oct 08, 2010 10:48 pm

I would be a good idea