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Forums28
Topics3,983
Posts19,061
Members1,018
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Most Online238 Feb 9th, 2024
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Re: Preferred cruising RPM ?
[Re: lakesailor]
#9582
05/24/10 01:16 PM
05/24/10 01:16 PM
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Joined: May 2007
Posts: 2,668 Portsmouth, RI
Rhapsody #348
Past J/30 Class President
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Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
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The 2GM original version was 13hp. There are also versions that are 15, 18 and 20hp. The 2GM20 is 20 HP and installed on some J/30s. if there is an "F" suffix (e.g. 2GM20F), the engine was installed as fresh water cooled, although some without the "F" suffix have been converted to fresh water cooling.
ps - Not all the Yanmars in the J/30 are 2GM series. They also installed 2QM and 2YM series engines.
Last edited by Rhapsody #348; 05/24/10 01:34 PM. Reason: more Yanmar engine types added.
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Re: Preferred cruising RPM ?
[Re: NaturalHigh]
#9589
05/27/10 03:43 AM
05/27/10 03:43 AM
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Joined: Oct 2007
Posts: 160 Vancouver, BC, Canada
dlabrosse
Senior Member
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Senior Member
Joined: Oct 2007
Posts: 160
Vancouver, BC, Canada
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Bill, Thanks for the tip about fuel consumption. I had my suspicions that fuel consumption was considerably greater at high rpms but really had no idea it was that significant. This makes alot of sense though and I will have to keep it in mind the next time the wife pushes me to do 6.5 knots to get the next crossing over with.
Dominique Labrosse Red Five, #92
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Re: Preferred cruising RPM ?
[Re: dlabrosse]
#9590
05/27/10 07:32 AM
05/27/10 07:32 AM
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Joined: May 2007
Posts: 2,668 Portsmouth, RI
Rhapsody #348
Past J/30 Class President
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Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
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Dominique - there is an older post that has the Yanmar power curves. Look at the slope of engine power at the prop versus RPM. Going from approximately 2400 to 2900 RPM doubles the power output. In fluid flow, (depending on the type of flow and some other factors), power is related to the speed cubed and fuel consumption is linearly related to the power output. Theoretical hull speed on the J/30 is about 6.7 kts. Once you get close to that speed (in calm water), you're really burning fuel fast trying to go any faster.
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Re: Preferred cruising RPM ?
[Re: Rhapsody #348]
#9695
06/18/10 06:09 PM
06/18/10 06:09 PM
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Joined: Oct 2009
Posts: 381 Squamish, British Columbia
NaturalHigh
Senior Member
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Senior Member
Joined: Oct 2009
Posts: 381
Squamish, British Columbia
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On my delivery to Swiftsure I ran Natural High at 2100 RPM which is nice and easy on the ears. She sipped a cool 0.46 gph (US) or 1.75 Lph
Last edited by NaturalHigh; 06/18/10 06:12 PM.
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