When I first got Calypso, I installed a water lift muffler on the exhaust of the 10 HP single cyclinder Sabb engine she has. However, a few months into cruising I had problems with the exhaust valve sticking open (no compression when trying to start). There were heavy carbon deposits jamming the valve in the guide. I assumed it was backpressure related. I removed the waterlift muffler and have not had any valve problems since. But my ears ringing!
In retrospect, I think the problem may have been overload related. I may have been running the engine with too much pitch on the prop (variable/reversable pitch).
Do other Sabb owners use a muffler? What type and what has been your experience.
I do have a new set of valves and guides. I have a compression leak - I presume it’s the valve/seat.
Second topic: transom exhaust fittings. Calypso originally had a 1.5" mushroom through hull for the exhaust. This seemed to do an optimal job of splattering the exhaust all over the transom. I replaced it with an ugly plastic fitting which had a built in rubber flapper valve. This has since turned to dust. So I’m looking for a good replacement fitting. I’d like to get something that protrudes a good inch or two from the hull - to limit how much splatter gets on the hull. The single cyclinder Sabb slugs the exhaust flow more than multi-cylinder engines, which seems to aggravate the splatter issue. I have not found any decent looking fittings from mainstreem sources. I have seen the drawings for the custom-fab SLM fitting. Does anyone have any recommendations?
I do have a 2" Vetus fitting with corresponding internal plastic goosneck (recovered from a wreck in Puerto Rico), but this size is overkill for my engine - I’d like to avoid mixing and matching exhaust hose/fitting sizes. 1.5" is what I need.