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Old 12-09-2011, 12:45   #1
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Universal Engine RPM

25hp universal in a Catalina 30MKII --- can someone provide a max sustainable engine speed for long distance cruising?
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Old 12-09-2011, 13:15   #2
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Re: Universal Engine RPM

Which model, and/or what year?

According to MarineDieselDirect:
http://www.marinedieseldirect.com/universal/200157/
M12 Maximum RPM 3600; Cruising Range (Approx.) 2600 - 3300 RPM
M20 Maximum RPM 3600, Cruising Range (Approx.) 2600 - 3300
M35 Maximum RPM 3200; Cruising Range (Approx.) 2600 - 3300
M28 Maximum RPM 2800; Cruising Range (Approx.) 2000-2400
M40 Maximum RPM 2800; Cruising Range (Approx.) 2000/2500 RPM
M50 Maximum RPM 3000; Cruising Range (Approx.) 2000/2500 RPM
etc ...
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Old 12-09-2011, 13:26   #3
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Re: Universal Engine RPM

Universal M-25; 1993 Catalina MKII WK,TR.........
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Old 12-09-2011, 13:31   #4
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Re: Universal Engine RPM

Let me Google that for you:

Universal M-25 Images and Specifications - Universal Diesel Engine Owners Manual - Marine Diesel Direct / Torresen Sailing Site

Redline 3000; cruising speed 2100-2600 RPM.
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Old 12-09-2011, 13:39   #5
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Re: Universal Engine RPM

Thanks for the quick response. I generally keep engine speed to 2200, but in heavy weather really need more power. Seems 2500 into steep chop is sustainable.......though experience has shown that fwd progress (SOG) slows to <1kt with head winds exceeding 25kts in anything over 3' chop
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Old 12-09-2011, 13:50   #6
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Re: Universal Engine RPM

Universal M25 (Oddly, 21 H.P. @ 3200RPM)
Maximum RPM 3000 - Cruising Range (Approx.) 2100/2600 RPM

I see Dockhead beat me to it.
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Old 12-09-2011, 13:56   #7
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Re: Universal Engine RPM

Quote:
Originally Posted by valinor30 View Post
Thanks for the quick response. I generally keep engine speed to 2200, but in heavy weather really need more power. Seems 2500 into steep chop is sustainable.......though experience has shown that fwd progress (SOG) slows to <1kt with head winds exceeding 25kts in anything over 3' chop
Most diesel engines actually like to be run near redline and full load for a certain percentage of their duty cycle, and many manufacturers recommend it. So if you need the power in bad weather, I would say don't hesitate to run it up to 85% or more of redline -- 2800 RPM or so. Should be perfectly ok for an hour at a time, or so, and possibly even beneficial for the engine.

My Yanmar 4JH3HTE is redlined at 3800; max continuous is 3700. Although my usual cruising range is 2200 to 2500 RPM, I try to run it at 3500 to 3600 for an hour every twenty or thirty hours. Usually when trying to punch through head seas -- the situation you are talking about.
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Old 12-09-2011, 14:05   #8
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Re: Universal Engine RPM

Quote:
Originally Posted by valinor30 View Post
Thanks for the quick response. I generally keep engine speed to 2200, but in heavy weather really need more power. Seems 2500 into steep chop is sustainable.......though experience has shown that fwd progress (SOG) slows to <1kt with head winds exceeding 25kts in anything over 3' chop
I've got a Catalina 30 Mk1, previously with an M20 diesel.

I've since converted to electric and sold the diesel, but when I did have it, the heat exchanger was torn up, so it overheated at anything over 2200 rpm. I would run at 2200 all day long, but bump it up to 2300 and needle would start to rise and the alarm would sound in minutes. Even so, with the 2 blade Campbell Sailor prop, I would easily hold 5 kts SOG in the harbor (smooth water) into an average 10-15 kts headwind. The max I ever tried was 2500 rpm, and that sounded like the thing wanted to explode, so I was always too chicken to run it up there. When the wind is up we generally sail, so I didn't very often motor into those conditions, but it seems a bit on the low side.

Do you clean the bottom regularly? I am consistently amazed at the performance difference between a clean and fouled bottom (I pay a lot of attention to performance now doing a lot of data logging as I play with the electric). Also, are you perhaps under-propped?

I'd suggest you ask over at the yahoo groups Catalina 30 group. There's something like 800 members, 799 of whom are a lot smarter than I am. The archives there are a real treasure trove of Catalina 30 knowledge.

JRM
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Old 12-09-2011, 14:06   #9
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Re: Universal Engine RPM

Quote:
Originally Posted by Dockhead View Post
Most diesel engines actually like to be run near redline and full load for a certain percentage of their duty cycle, and many manufacturers recommend it. So if you need the power in bad weather, I would say don't hesitate to run it up to 85% or more of redline -- 2800 RPM or so. Should be perfectly ok for an hour at a time, or so, and possibly even beneficial for the engine.

My Yanmar 4JH3HTE is redlined at 3800; max continuous is 3700. Although my usual cruising range is 2200 to 2500 RPM, I try to run it at 3500 to 3600 for an hour every twenty or thirty hours. Usually when trying to punch through head seas -- the situation you are talking about.
Thanks! I got similar advice from Diversified Marine in Annapolis - super folks - concerning putting diesels under load.
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Old 12-09-2011, 14:16   #10
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Re: Universal Engine RPM

Quote:
Originally Posted by JRM View Post
I've got a Catalina 30 Mk1, previously with an M20 diesel.

Do you clean the bottom regularly? I am consistently amazed at the performance difference between a clean and fouled bottom (I pay a lot of attention to performance now doing a lot of data logging as I play with the electric). Also, are you perhaps under-propped?

I'd suggest you ask over at the yahoo groups Catalina 30 group. There's something like 800 members, 799 of whom are a lot smarter than I am. The archives there are a real treasure trove of Catalina 30 knowledge.

JRM
Irene provided a great test case - no I didn't sail in her, but did take the opportunity to haul (with a little $help from BoatUS) for bottom paint and a thru hull valve replacement. New bottom with clean three blade prop added a bit over 1kt under power and almost as much under sail, and the bottom was in pretty good shape to start.
[see http://backcreekcatalina.blogspot.com]
I;m always surprised by the difference - despite the weekly cleaning lesson from the racing community
In any event, planning to head south next month and looking at close to 3000nm in the next 6 months - a lot under power, so I try to treat my engine right!
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