Having replaced the CV Midget on A49 with the larger engine, I followed the original Midget exhaust line through the aft cabin using fabricated S/S injection exhaust stubs feeding into high temperature exhaust hoses, hence into a Y junction and thence into a deep Silent Flow silencer and a pipe, carrying, or at least attempting to carry, both exhaust gas and water, passing along the aft cabin sole to a goose neck on the transom outlet.
When the engine was run no water emerged at the transom. No doubt, I assume, because the push of the exhaust was insufficient to carry the water the full distance ,and past the obstacles, to the transom and so it is flooding the system
The cunning of the original twin wall pipe system, which separates water and gas by injecting water into the narrow space between the tube walls, so the water merely cools without losing its velocity, is now apparent.
I am conscious that the low siting of the flat-twin engine design places the exhaust valves close to any retreating exhaust water or advancing sea, if the exhaust outlet were resited closer to the engine to permit the exhaust to carry the cooling water more readily
I would be very grateful for any advice.
Other work goes well; the new keel pins and alloy rudder, afterthe rebuilding of the keel support system, have
allowed me to join the ranks of the swingers. I don’t dare fit the new cabin sole before sorting the bigger engine, given the marginal accesibility.