Proper cruising rpm for Yanmars?

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Half Moon 36073
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Joined: Fri Nov 12, 2004 11:07 am
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Proper cruising rpm for Yanmars?

Postby Half Moon 36073 » Fri May 20, 2005 7:49 am

I've not seen published a suggested rpm for the 18 hp Yanmars. Anyone have information? Alex Kehayes 36073

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Joined: Tue May 18, 2004 10:23 pm
Location: Boston, MA (36072)

Postby Loki » Mon May 23, 2005 6:43 pm

I run them a bit under 3000. The redline is 3600, and the wisdom I've heard is to run at about 80-85% of redline. With no load (in neutral), you should be able to rev right up to 3600, but in gear wide open they top out at 3200 with a clean bottom, somewhat less at the end of the season.

I added proper temperature gauges and a while back I noticed the engeins ran very hot over 2700. It turned out the heat exchangers were clogged with eel grass. Flushed out I can run wot and the temp stays under 170.
Jeff Morris, Loki 36072

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