I would much prefer to do a waterlift, and the bilge is deep enough to position such a muffler below engine level. However, the side discharge means that the top loop of such a system would have to go up to almost saloon overhead level (to prevent siphoning when heeled). This would result in excessive backpressue in the exhaust
, I fear. Although the authorities seem to be divided on this point; some feel back pressure is a critical issue, while others advise that it is essentially a NON-issue!
This boat, an S&S 30 was built by Aquafibre, Ltd., of Rackheath, England in 1971. The S&S 34s (e.g. Fastnet racer Morning Cloud of Prime Minister Edward Heath fame) also have this side exhaust
(See Good Old Boat cover, issue before last. That boat, Redline, is an S&S 34, and you can see smoke exiting just above the bootstripe on the port side. (I wonder if they flipped the negative over - my boat has the exit on the starboard side.))
The other problem with a waterlift setup is the potential to siphon through the water pump
. The engine is located dead center in the middle of the saloon (under the table). There is no room above the engine for an anti-siphon loop unless it penetrates the dinner table!
Therefore I have reluctantly decided on a long hot/dry run to the head/saloon wall where the standpipe is located.