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Old 11-04-2013, 04:21 PM   #19
timjet's Avatar
Join Date: Apr 2009
Posts: 1,912
Running single engine on a twin has been discussed thoroughly before on this forum. Do a search going back 2-3 years and you'll find a lot of info and opinions on this. Provided you can get past the dripless seals and free wheeling tranny problems there is an easy way to determine if single engine operation is cost effect from a fuel stand point.

Operate your boat with both engines running at whatever speed you want to compare, but likely just below displacement speed. Note the GPS speed and engine rpm. Now operate single engine at the same rpm as before and note the GPS speed after the boat is trimmed for the single engine. If the GPS speed single engine is more that half the speed with both engines running then there is a fuel saving running single engine.

At about 7.5 kts my boat drops only about 1.5 kt on one engine.
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Carver 355 ACMY Twin Cummins Diesels Sold
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