Toad
New Member
Where can you find boat specific optimal cruising rpm's & gph consumption data? Sea Ray 2002 340AJ 8.1S's
Optimal Cruising rpm's 340AJ
- Thread starter Toad
- Start date
Bodkin Creek George
Member
Trial and error using your own boat is the best way. I have a 340DA 2004 with 8.1's and my best in a moderate to flat sea is 3200 at 24mph. Each boat is different. Hope this helps.
George
George
osd9
New Member
I'm not positive, but I'm pretty sure that your boat didn't come from the factory with a smartcraft monitor installed. However, I am sure that those motors are pre-wired for a smartcraft display. If you buy the smartcraft monitor, and hook it into the motors, you will get your instaneous GPH on each motor. You can then decide for yourself what is maximum.
The dipslay install is pretty much plug and play. You won't get all the same data as a boat from the factory with all the sensors in the tanks, water system, trim tabs, etc, but you will get RPM, engine hours, Sync, oil pressure, water temp, water pressure in the water pump housing, GPH, MPG (if you hook a gps sensor on the 0183 line....not reliable), etc, etc...
The dipslay install is pretty much plug and play. You won't get all the same data as a boat from the factory with all the sensors in the tanks, water system, trim tabs, etc, but you will get RPM, engine hours, Sync, oil pressure, water temp, water pressure in the water pump housing, GPH, MPG (if you hook a gps sensor on the 0183 line....not reliable), etc, etc...
Bodkin Creek George
Member
You're so right. I'm so used to using it that I forgot to mention it. Thanks for bringing that up.
Jimmy Buoy
Well-Known Member
- Dec 3, 2008
- 2,468
- Boat Info
- 2003 Cobalt 293
- Engines
- Twin Volvo-Penta 5.0 270hp & DuoProps
Anybody buy a smartcraft monitor lately that would know what the approximate cost outlay would be??
osd9
New Member
I bought one on ebay in 2005. back then, the going price on ebay for the SC500 monitor was ~$500. The associated cables/junctions were another ~$150-200.
white glove
Member
I would begin by starting with the recommended cruising rpm which is what the engine manufacturer suggests and see what cruise speed you get. This is really where you want to run and a good rule of thumb on a gas engine is 3/4 w.o.t.. On a merc 8.1 I beleive that rpm is somewhere around 3450 . This is the best speed for engine longevity and depending on the drives will yield a fuel efficient speed. As for fuel flow I had installed a floscan computer in my 2001 310 dancer t350 horizon with zf63-4 v drives and at my recommended cruising rpm of 3650 I run at 21-22 kts. By adjusting the throttles and tabs (ever so slightly) I was able to fine tune to my best consumption of 11gph. The floscan is very user friendly in that it is graduated in 1gph readings and provides a good real time visual aid that reflects your imputs however slight very well. I had also installed a system view from smartcraft when I reengined to my new horizons but honestly I use the floscan for fuel consumption. The rig is easy to install and I believe is somewhere around 450.00 I use my smartcraft for reliable digital data from the engines e.g oil pressure and temp but find an analog display for fuel consumption easier.You may find my fuel consumption high but I am in south Texas where we are forced to use ethanol this combined with high ambient temps and humidity really hurt fuel efficiency so much that I had to re prop.
Toad-
Todd Reipe at Buds has a book with the values your looking for in your boat. Have him make a copy and fax to you. I dont believe he can scan and e-mail from office.
Todd Reipe at Buds has a book with the values your looking for in your boat. Have him make a copy and fax to you. I dont believe he can scan and e-mail from office.
HAMBONE2
Member
i have a 2008 330da with smart vewe 2000rpm is 12 gpm 10mph that wre i cruse at with 8.1s
