Exhaust Protection

LuckyPenny

Petty Officer 1st Class
Joined
Feb 21, 2003
Messages
256
I have seen and read about so many boats being lost because of exhaust boot failure. Has anyone ever tried or seen a system with a gate valve installed at the transum. It can be secured when the boat is not in use or used underway if the boot fails. Any thoughts?
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: Exhaust Protection

hello<br /> sounds good. one drae back. the guy that wont do the maint on the cooling system or exhaust system wont do the maint on any valve system so it wont keep any boats afloat. exhaust boots dont fail just cause and out of the blue. they wear out over time get old ,crack get nasty then fail or the cooling system does the aformentioned and burns holes through the boot.<br /> but design it and we can sel it:)<br /> good luck and keep posting
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,291
Re: Exhaust Protection

The "Exhaust Bellows" Can Not cause the boat to Sink........<br />The Exhaust Bellows Can be Totally Removed,+ NO Water will Enter the boat.........<br /><br />Now, The Driveshaft Bellows, or even the Shiftcable Bellows is a Very Different Story.......
 

LuckyPenny

Petty Officer 1st Class
Joined
Feb 21, 2003
Messages
256
Re: Exhaust Protection

That does not make any sense. If the exhaust boot (pipe) fails; for any reason, than the hull is open to the sea. We are not talking about an I/O, rather a direct drive shaft.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,291
Re: Exhaust Protection

We are not talking about an I/O, rather a direct drive shaft.
I'm Truely Sorry Luckypenny, 97% of the posts in this forum Are about Outdrives......<br /><br />My Mistake....
 

scamper

Petty Officer 2nd Class
Joined
Sep 26, 2003
Messages
183
Re: Exhaust Protection

I’m part of the other 3% however the term exhaust boot is somewhat miss leading. I/O’s do have boots. Inboard have the exhaust pipe go straight through the transom. I’ve had an inboard most of my life and never a problem with the exhaust at that part of the boat. However it should be treated like any other through hull fitting. One thought would be if this is a major concern simply move the exhaust outlet above the waterline. Cut your new ports, use the cut out to fiberglass in the old and use a length of rubber exhaust pipe to make the connection.
 

bob58

Petty Officer 2nd Class
Joined
Sep 27, 2003
Messages
114
Re: Exhaust Protection

Scupper vavles (outlet flappers) installed on the outlet would drastically reduce the amount of water intrusion should your hose fail. This would allow the bilge pump to keep up with the inflow of water and keep from damaging the exhaust and mufflers in the event of forgetting to open the valves on startup!
 

scamper

Petty Officer 2nd Class
Joined
Sep 26, 2003
Messages
183
Re: Exhaust Protection

One more thought. Outlet flappers keep water from coming into the pipe from the back. It will not help you if the pipe itself fails.
 

bob58

Petty Officer 2nd Class
Joined
Sep 27, 2003
Messages
114
Re: Exhaust Protection

One more thought. Outlet flappers keep water from coming into the pipe from the back. It will not help you if the pipe itself fails.<br />
I beg to differ, the flappers or scuppers are installed on the outboard end of the thru-hull pipes. This allows added protection in case of an exhaust hose failure and water intrusion. Most exhaust thru-hull pipes end within an inch of the transom unless extensions have been added. The idea is to restrict the amount of water that could possibly flow into the engine compartment via the thru-hull and this will do that! If the pipe itself fails, no valve will stop the inflow as it will be a thru-hull hole. Chances of this happening are so slim they are not worth mentioning.
 
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