I would like to hear from the group who have relocated their exhaust fitting to the side location, in place of the deck drain outlet. Any pros / cons; or, from anyone else that has considered this move.
Jack Dokter
Nine Lives 1983 26C W21 #099
Penetanguishene, Ont
I recently installed the Crossman exhaust outlet. Murray's
instructions are very helpful as far as location is concerned. You
are going to have to undercut the hole in the hull that you make for
the new outlet and line with epoxy because of the cored hull. The
only problem that I had with the crossman kit was that the holes in
the backing plate did not line up with the flange holes on the exhaust
tube. A little last minute adjusting solved this. I really don't
miss having to clean the exhaust mustache off of the transom after
spending time on the ICW getting out to the Gulf.
ron<<
S/V Serenity II
NS U 30 479
Gulfport, FL
Hi Jack,
We have our exhaust high and rear
(see image). It has worked very well for us.
Some diesel mechanics worry about high exit
exhaust back pressure increasing carbon deposits.
I worry about this.
Some people try to redirect the exhaust exit
sideways to starboard from its original location.
It may be worth a try.
Cheers,
Jon Matthews EVENSONG 30U 266 Toronto
Or you could switch to Electric Propulsion and be done with any exhaust issues forever. 
I'm still thinking what I will do with the old exhaust port on the transom. Use it for an additional cockpit drain or add another bilge pump.
Mike
BIANKA
http://biankablog.blogspot.com
Great responses!
I also spend too much time cleaning the stern of that ugly black line. Must be a Westerbeke thing.
Being that the 26’ Nonsuch’s don’t have balsa cored hulls, this task should be a step or two easier to modify.
My thought was to use the existing location of the “starboard deck drain’s” thru-hull fitting to eliminate drilling another hole. I still would need to replace the nylon fitting with a Stainless thru-hull. The exhaust line appears that it would easily reach.
Then, replace the existing stainless exhaust outlet with a nylon thru-hull (only for a more pleasing appearance) and re-route the starboard deck drain line to the stern..
Jack Dokter
Nine Lives 1983 26C W21 #099
Penetanguishene, Ont
Would the starboard deck drain’s though hull be too low on the waterline for the task, especially when motor sailing? If I were to change the position from the original position aft, I would position it half way up the hull on the starboard side aft. I am interested to know if Jon’s position high on the transom causes fumes to blow into the cockpit in a following breeze, or due to backdrafts? Having a fitting close to or at the waterline poses a risk of a serious leak.
Jack, I can assure you that the black moustache is not a westerbeke thing. My Universal does the same when I crank her up to 5 knots plus and bury the exhaust. If my engine ever needed to be replaced, I would join Jorgen and Mike and go electric.
It makes far more sense in this climate for the sailing I do. Diesels need to be run to keep them happy and their fuel fresh. I am happy as soon as I shut it off.
John Newell
Mascouche 26C 1
Toronto
Answer : absolutely no problem ever with fumes.
Somehow I knew you’d chip in with an electrifying answer, Mike. Consider using that exhaust port for a relief tube cleverly hidden under the helmsmen’s seat.
Regards,
Joe Valinoti
S/V IL Gatto NS30U #221 (1984)
Sea Harbour Yacht Club
Oriental, NC
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Not sure the Environmental Protection Agency and Coast Guard would approve. BTW what’s an oil filter?
Mike
BIANKA
(Currently under a tornando watch)
http://biankablog.blogspot.com
Jack:
I installed the Cressman exhaust as Murray recommends on the starboard side and have been very happy with the results. For some reason, the 2" exhaust hose had been choked down to 1-1/2" between the water-lift muffler and the transom outlet at some point (perhaps even at manufacture…Amity is a 1986) and when I bought the boat, the engine surveyor said I needed to replace that with 2", so I ordered the 2" size from Murray and bought new hose.
Bob Hutton
N30U “Amity”
Has anyone eliminated the mustache by going with a two inch hose from the
muffler through a new two inch outlet in the transom? Bob Horne, 1989 26C,
ENCORE
I have never had a mustache but I changed to the larger exhaust to reduce back pressure. My original water exchanger went from 2" to 1 1/2 all the way to stern. Replaced the entire system with vetus parts 2".
I do have a 18 HP westerbeke and wonder if its the size of the engine that makes the stache. I feel my engine is undersized for storm running conditions but everyday motoring I think she is sized just right. Maybe boats the the larger engines are not working at their design capacity and thus not burning all the fuel fully and thus leave a mustache? Any comments from boats with engines 18hp and under?
As far as I can determine, the moustache is the result of the stern digging in and the exhaust being submerged or partially submerged. This happens at around 5 knots on Mascouche in fresh water. A larger outlet or extension has not solved the problem. I have a 16 hp Universal which weighs as much as a Westerbeke 21.
After hearing from Jon Mathews of Evensong., I believe the best solution is to raise the exhaust outlet on the stern by a foot or two so it does not come become submerged. In a previous post, I thought a side location would be best, but this is a compromise and more prone to being damaged than being located on the transom. Jon assures me that fumes do not bother him. His exhaust is mounted high on the transom.
John Newell
Mascouche 26C 1 1981
Toronto
I added an extension to the existing transom outlet on my NS 30 U with a W27. It reduced the amount of black mustache significantly.
John Ferrero
Puffin 30U #297
Huntington NY
Thanks, Bob.
I did notice the downsizing of exhaust hose after the muffler, but I suspected the reasoning behind that was to accelerate the water flow to ensure it can be lifted up through the loop created just inside the wall of the stern. Too bad we can’t contact someone from the design team to inquire why they chose some of these peculiarities.
A previous response had mentioned that the exhaust port, being relocated to the side, should consider mounting the thru-hull a reasonable distance above the water line, but if you notice that some vessels “such as Hunters” actually have their exhaust below the water line. I wonder if this needs to be a critical choice as the top of the exhaust loop is way above the water line no matter how much the vessel is heeled.
I have to say, I appreciate everyone’s responses. And, the use of this discussion board is a fantastic way to help each other out. Bravo!
Jack Dokter
Nine Lives 1983 26C W21 #099
Penetanguishene, Ont
I installed a Cressman fitting in the position he recommends (turn of the bilge on the starboard side) several years ago and have been very happy with it. No more mustache. The only downside being that very occasionally, when tacking from a broad reach, in light air, the mainsheet will snag on the exhaust fitting as the sail goes across.
David Young
Bay Cat, 30U #402
Suttons Bay, MI
The boats that I’ve delivered that had the exhaust port below the waterline concerned me in that I could not determine if they were pumping cooling water or not. Next time I’m hauled, I’ll try the extension.
Joe Valinoti
S/V IL Gatto NS30U #221 (1984)
Sea Harbour Yacht Club
Oriental, NC
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Me too.
At first I used a piece of Jose but I replaced that this year with a chrome extension purchased from the Canadian Tire auto section. Not only does it look good but it goes a long way in dissipating the backwash that causes the moist ache.
Dictated to my iPhone 4S which still has not mastered the subtle aspects of a Scottish accent but should be able to get most of it right.
Bob: Personally, I think that part of the reason for the mustache is the air turbulence caused by the Nonsuch square stern. One would presumably be motoring in calm conditions, and the air slips past the boat and creates a vortex behind the transom. Most of the time my original exhaust outlet was above the water, yet I had terrible problems with black particulates from the diesel exhaust on the stern. I have had absolutely no problem since I installed the Cressman on the starboard quarter. And now I rarely smell the exhaust at all, whereas it was a frequent (but not intolerable) problem before the relocation.
Also, for those who have registered concern with cored hulls, it was very easy to drill the hole with a hole saw and epoxy inside the circumference of the hole while sitting in the starboard lazarette, since the new exit point is located just above the shelf about a foot shy of the transom. I did the whole retrofit in the water with no problem.
Bob Hutton
1986 N30U “Amity”
I share the same experience that Bob has had with the installation of
the Crossman exhaust outlet. I also installed the outlet while
Serenity was in the HOH and other than the problem with the backing
plate that I spoke about previously, the installation was relatively
easy.
ron<<
Serenity II
NS U 30 479
