Westerbeke 27 max rpm and cruising rpm?

[Jim in NVa]

If I understand the Westerbeke literature correctly, the max WOT of the Westerbeke 27 engine is supposedly something like 3,000 rpms.  And diesels like to run at approximately 80 percent of max rpms,which would be approximately 2,400.  Is that right?  What do you aim for in rpms when doing long distance motoring?

I know it's a sailboat but I just came back from a week long cruise where the winds did not cooperate.  Hence my questions.

Thanks,

Jim Cosgrove
FATE 30U #343
Galesville, MD

[Jack Dokter]

I find that ANY combustible engine just enjoys operating, and is the most fuel efficient, at the 2000 to 2200 rpm  range.  Just consider the engine as nothing more than an air pump with self perpetuating capabilities.
Anything more than that rpm, the engine is working harder unless it was designed to do such a task similar to high output performance engines.
Something to consider is what's coming out of the exhaust.  Blackened exhaust also indicates over work for a diesel engine.    You will even see this condition with transport trucks that push the engine during high rpm and full throttle situations.

The diesel engine can run at 3000 plus rpm, but I wouldn't take it to that level except for short durations.

Jack Dokter
Nine Lives 26C W21 099
Penetang 0n

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[Capt. Mike]

Back when I had a diesel on board 2000. RPM was about the limit I would operate at most of the time. Above that noise and vibration were too annoying for any length of time.

Sent from on board BIANKA
http://biankablog.blogspot.com

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From: Jack Dokter <dokte...@gmail.com>

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Date: Mon, 06 Jul 2015 18:25:38 -0400

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ReplyTo: INA-Nonsuch-Di...@googlegroups.com

Subject: Re: Westerbeke 27 max rpm and cruising rpm?

[Katmando]

I get 5 Knots at 1800 in flat water, Westerbeke 33a with a custom Campbell Prop.

Reasonably quiet, very smooth and gives me time to contemplate no wind and what am I going to do whenever I get to where I'm going. It also gives me time to cogitate why I'm going when there is no wind. Nonsuches open up so many lines of thought..

Katmando NS30u

Whitby.

Sent from my iPad

[Joe Valinoti]

I have a W-27 and fast cruise at 2800.  Slow cruise at 2600.  My prop is a Gori two blade.

 

Joe Valinoti
S/V IL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USA

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[Jim Cosgrove]

Thanks Joe. I have a 3 blade Flexofold. Previous owner said he used 2600 rpm.  In flat water with a cleanish bottom, what speed do you expect from your boat at those RPMs?

Sent from my iPhone

[Joe Valinoti]

In flat water, I can do about 6 to 6.5

 

Joe

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[Joe Valinoti]

My recollection is that 2800 gives me 6.6 in flat water.

 

Joe Valinoti
S/V IL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USA

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From: Jim Cosgrove

Sent: Tuesday, July 07, 2015 2:30 PM

To: INA-Nonsuch-Di...@googlegroups.com