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Sea Ray
 BoatUS Boat Groups/Manufacturer Forums>>Sea Ray
Subject Topic: Cruising RPMs Post ReplyPost New Topic
 
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carlosva19363
"Seaman Recruit"




Joined: June 11 2007
Posts: 5
Posted: September 04 2007 at 15:02 | IP Logged Quote carlosva19363

I have a 2003 240 SD with the Merc 350.  Does anyone know the optimum cruising RPM for this boat?  I've been told 3500....

Thanks!
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Rock Hall
"Seaman Recruit"




Joined: February 18 2006
Posts: 16
Posted: September 04 2007 at 16:06 | IP Logged Quote Rock Hall
Generally, minimum plane speed is considered the most fuel efficient cruise speed. At what speed does your boat come up on plane? I have the same engine and similar size boat. With the wife and I, I run at about 3200. I consider that my cruise speed. If I drop it down a little I'm still on plane but just barely. If I load the boat up, I have to run about 3600 to keep the boat on top of the water.

When I take a long cruise, I run at the minimum speed to keep the boat up. I hope this helps.

Mark
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STIHLBOLTS
"Seaman Recruit"




Joined: July 02 2003
Posts: 18
Posted: September 05 2007 at 23:23 | IP Logged Quote STIHLBOLTS
Does your 03 have SmartCraft technology?  You can dial in by using the gph window and see where your speed is vs gph and get a balance.  I used mine to come up with a speed of 24 mph and gettting 7 gph at that speed.  But for the most part because of the water in the bay, I come off and on plane on a pretty regular basis just to deal with traffic and wave action.     
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Dave SR
"Seaman Recruit"




Joined: December 07 2004
Posts: 10
Posted: September 10 2007 at 19:07 | IP Logged Quote Dave SR
I found that optimum cruising speed with my 2002 240 SD with a 5.0 motor was 3000 RPM. As I recall, the boat was running about 25MPH at that RPM.

__________________
2006 Sea Ray 260 Sundancer
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dpmulvey
"Seaman Recruit"




Joined: August 27 2007
Posts: 6
Posted: September 18 2007 at 11:28 | IP Logged Quote dpmulvey
75-80% of max RPM is the recommended norm.  

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Regards,

David
330 Sundancer / 6.2 Mercruisers
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amiabledave50
"Seaman Recruit"




Joined: November 25 2007
Posts: 2
Posted: November 25 2007 at 11:02 | IP Logged Quote amiabledave50

I have Smartcraft Tech also. What I did, with GPS on and I/O trim at 0, was to start at the lowest speed and be able to get on plane with the trim tabs and making the boat trim ( level ). I logged speed, rpm, gpm and I/O trim. I then increased rpm by 50 to 3500 logging all info. I then went back to the lowest rpm and increased the trim by 1. Made another run, etc. to trim 5 which started to cavitate badly and stopped the testing.

  I found that for my boat 2006 Dancer 260, MPI 300HP is trimmed at 3, rpm at 2750, gps speed average 25mph with a gpm at 2. This is with 2 people, Spanky the dog, all gear and food for an over nighter.
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amiabledave50
"Seaman Recruit"




Joined: November 25 2007
Posts: 2
Posted: November 25 2007 at 11:15 | IP Logged Quote amiabledave50
Please make ghm to gph. Gas is expensive enough
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Rock Hall
"Seaman Recruit"




Joined: February 18 2006
Posts: 16
Posted: November 25 2007 at 11:15 | IP Logged Quote Rock Hall
Are you saying 2 gallons per minute? That cant be right. If it's 2 GPH, thats incredible!
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Rock Hall
"Seaman Recruit"




Joined: February 18 2006
Posts: 16
Posted: November 25 2007 at 11:22 | IP Logged Quote Rock Hall
I have a smaller Dancer. 270hp, new engine and my best is 20mph, 3100 rpm, 10.5 gph. If the water is rough the best is about 3400 at 12 gph.
Of course my best fuel economy is at Idle speed doing about 5 mph.
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