I have twin Cummins 270 on a 3587 and found the most economical cruise is 1100 RPM @ 7 knts. Is this RPM to low to keep the oil flowing through the head. The engines run very smoothly but I am curious whether this may cause eventual damage if I maintain this speed over long term. I do run it up to high speed for 5 minutes at the end of each day after a long cruise to bring it up to temperature and blow out any carbon.
Bruce
Bruce
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