Fumes drift into rear of the cockpit
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30 August 2009 - Hi- saw your website recently. Have just purchased Deltacraft @ Port Stephens and have it on mooring in Salamander Bay. Had motor (18hp) looked at and told cheaper to get 2nd hand one which I did. Having been a yachtie, wondering whether fumes that drift into rear of cockpit normal or not as I'm sure my wife will not like when she goes on her maiden voyage. Thinking of putting a baffle over stern platform as way to diffuse fumes. Would appreciate any feedback etc on the matter. 
Also would like to get in touch with other owners in Port Stephens area. Many thanks, Chris 2 September 2009 - Chris at Port Stephens asked for feedback on this problem. This has always been a problem due to the vacuum effect of the transom. A FIX that works is to attach a 600mm length of hose or copper pipe to the exhaust as shown. This moves the exit point of the fumes away from the vacuum effect and they disperse in the breeze and are not sucked into the cockpit. |
December 2014 - We are now the proud owners of a Delta.
We have notice the fumes coming from the transom exhaust.
What is the best way to cure this.
23 December 2014 - The open end is under water when underway but out of the water at rest, if possible, but not essential, this is why the pipe 500 mm long (preferably rubber hose) is always curved down.
This is a very effective silencer.
Water going back up the pipe is stopped in every case by the water lock muffler in the boat, never had a case yet of sea water entering the engine from this source. The back pressure is also negligible for the engine to cope with.
27 December 2014 -
We have purchased exhaust rubber piping. The water lock muffler is attached in a way that makes it larger than the circumference of the actual exhaust pipe because of the hinging to the exhaust pipe.
Question.
Can we cut a slit in the rubber pipe, we have bought, long enough so that it will go over the muffler flap and hinge and then use a stainless steel clamp on the exhaust pipe?
Answer.
Maybe but not recommended, always take up the difference with a sleeve.
Question.
When we looked at a larger size of rubber piping that would fit over the hinged area it is not flexible enough to be clamped to the smaller size of the exhaust pipe.
Answer.
Can't you get a hose to fit the exhaust flange / sleeve again.
Question.
When you say the back pressure is also negligible, is it essential to leave the water lock muffler on the exhaust pipe.
Answer.
Essentially as it will not allow water back in to the engine when the 500mm rubber pipe is attached?
Question.
The exhaust pipe is only very short coming out of the boat so maybe we thought we might need to have extra welded onto it to enable length for clamping?
Answer.
Maybe but theres very little drag to pull it off the flange.
Question.
The reason we want to attach the exhaust hose is to eliminate the smell of the diesel, we love the sound of the boat so no need for us to silence that.
Answer.
Yes it does that also no more black soot on the hull from the exhaust.
Regards Steve .L
Editors note. - Can anyone please advise if they have had experience with this problem and advise what action they took to correct it.
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