new exaust

[FAITIRA]

Any one by any chance changed a dry exaust to wet?
Particularly on a sail boat, mine is a Nic 32 MkX1.
Engine Sea Panther.
The engine is effectivly below the waterline.
The present ex system is dry from the manifold to a cast iron water mixer/injection box high under the cockpit coaming on the Stbd side, then wet flex to the transom o/let.
The engine is f.w. cooled, the sw exits the manifold then via a pipe to the mixer/injection box. All advice/experience welcome. Bill.

 

[rob2]

Some years ago a friend and I changed a dry system to wet on a T24. We later changed the Albin engine for an industrial Yanmar. Details of the design of wet exhausts are readily available from such sources as Vetus, etc.

To save money, we fitted a water injection exhaust elbow and a changeover ball valve. For starting and stopping, the water flow was sent down its old route to the separator - this avoids water flowing back into the exhaust valve during the start. Immediately the engine had caught, the lever was swung across and the water flow diverted to the injection elbow. Stopping was the opposite - divert to the separator, rev to blow the remainder through and then cut the engine (before the exhaust hose melts!).

 

[yoda]

Hi

Did exactly that earlier in the season. Made a significant improvement. You would need to fit an injection elbow on the exhaust manifold and feed the cooling water via a syphon break located above the waterline. The mixer would then feed down to a muffler and back to a swan neck at the transom. I think Vetus have a reasonable diagram in their book but I did find cheaper parts by shopping around. Getting the right size pipe to match it all together was a little trickey but fitting was straight forward I did find some good heavy duty clamps which proved invaluable. PM me if you want more.

Yoda

 

[FAITIRA]

Many thanks Both, food for thought!

 

[Bodach na mara]

I am confused by the question. You seem to have a wet system at present, with injection elbow mounted on the water-cooled manifold. That is what my Sea Panther has anyway. The rest is simple. In the Renown it consists of 5 metres of rubber exhaust hose led via a high bend (right up to deck level) and out through the transom fitting. No syphon break, no waterlock and no silencer. Works fine and the engine has never been flooded by a following sea. Yet.

 

[FAITIRA]

No Ken, it,s part a dry section, to an injection box high under the stbd cockpit coaming, the manifold is on the port side, as i,m sure you know!, then the dry section crosses over to the stbd side. I think because there is no height under the cockpit sole for the injection bend you describe. It,s the original Nic installation.

 

[Bodach na mara]

Funny that. because the injection elbow on mine is attached to a four-bolt square flange at the rear of the manifold. It takes up no space above the engine at all.

 

[FAITIRA]

pm,d Ken