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Old 10-26-2018, 06:38 PM   #21
firehoser75's Avatar
City: Nanaimo
Vessel Name: former owner of "Pilitak"
Vessel Model: Nordic Tug 37
Join Date: Feb 2018
Posts: 1,656
Hi Gordon,
Even though you "solved your issue", and I have had similar "brain farts", you might want to check out It is a website run by Seaboard Marine in California, but Tony posts tons and tons of free, really good information, particularly for Cummins engines (which I have , 6BTA). At wide open throttle, you should really aim for about 2950 rpm. Check out his site, he explains why way better than I could, and describes the full process to check this out properly.


Nanaimo, BC
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Old 10-26-2018, 08:49 PM   #22
City: Hampton, va
Vessel Name: Didi Mau
Vessel Model: 2003 Ocean Alexander 456
Join Date: Jul 2015
Posts: 1,041
Thanks Tom. I have been to his site plenty and subscribed to boat diesel when Tony was moderator. I’ll go back and look, but the manual calls for 2800 top rpm.


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Old 10-26-2018, 09:45 PM   #23
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City: Vallejo CA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 12,274
I rarely operate, even briefly, at wide-open throttle [2400 RPM] (usually operate at 43% [1800 RPM] load and occasionally at 72% [2200 RPM]. The only time max RPM wasn't achieved was when the fuel filter needed replacement.

Kar-KEEN-ez Koot
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