Sundancer 340 2001 range

[vriceflyer]

This weekend we did some speed runs at different RPM settings with a computer attached to the engines, which gave us fuel flow. Speeds from GPS. Below find my chart. Bottom has a few barnacles from the salt-water days and some scum from our winter fresh water. Sundancer is a 2001 340 with 454 MPI engines and 3 blade props.
Full fuel Вѕ water air temperature 64 water temperature 57.

SEA RAY 340
2001
PERFORMANCE

TWIN 454 MPI

Speeds by GPS
Fuel Flows by computer connected to engines.

RANGE IS 215 GALLONS

RPM MPH GPH MPG RANGE

700 3.9 2.0 1.95 419

1000 6.0 3.6 1.66 358

1200 6.8 4.4 1.55 333

1500 7.9 7.0 1.13 242

2000 12.4

2500 18.6

3000 16.9 24.0 .70 150

3200 20.5 26.6 .77 164

3400 24.1 30.6 .79 168

3500 25.0 31.0 .80 172

3600 26.4 33.4 .79 170

3800 28.0 34.8 .80 172

4000 29.5 38.0 .77 164

4300 32.6 47.6 .68 147

 

[dominic]

Did you try adjusting the trim at each RPM?

 

[vriceflyer]

Yes we adjusted the trim. I have found that I run the tabs down all the time at cruise to lower the bow and to get better performance when heavy (full fuel). With half tanks (700 pounds lighter) we get better speeds and run with less down tab.

 

[skolbe]

Hey - I now have some one I can race with my 320 with 350 Mag's and I could win. Your speed numbers look low compared to my 320 with 350 Mag's.

 

[vriceflyer]

skolbe what are your numbers?

 

[skolbe]

I cruise around 3600 rpm's at 25 mph GPS and burn 24 gph. WOT is around 5000 rpm's and is 37 mph at lots of gallons per hour. Can't remember. My boat is 11'5" beam. Seems like your top end is low.

 

[vriceflyer]

skolbe,

My WOP is 4300 RPM and 32.6 MPH. Your WOP is 5000 RPM at 37 MPH. The 340 might cruise at 37 if it could reach 5000 RPM. The 340 has an 11' 5" beam. Your fuel burn looks low at 3500 RPM.

 

[RamSport47]

his is about right for small blocks