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366 fuel consumption
Posted: October 24th, 2023, 6:14 pm
by Pcmcguire
Getting ready to move new to me 366 with Volvo penta 8.1s. Can anyone give me fuel consumption rates and most fuel efficient operating speed?
Re: 366 fuel consumption
Posted: October 24th, 2023, 8:19 pm
by bud37
Have a look at this.....not far off imo....just play with it a bit.
https://www.boat-fuel-economy.com/volvo ... us-gallons
Re: 366 fuel consumption
Posted: October 24th, 2023, 10:48 pm
by Pcmcguire
So 34gph per engine or 68gph. That does seem about right at WOT but hoping to get some feedback on rates at less than full throttle.
Re: 366 fuel consumption
Posted: October 25th, 2023, 6:12 am
by Cooler
Click on the engine list, and the tach will show various RPM stops. Might be a little conservative for a 366, but reasonbly close.
er
Re: 366 fuel consumption
Posted: October 25th, 2023, 8:27 am
by bud37
Fred please delete this, not sure what happened with this.
Re: 366 fuel consumption
Posted: October 25th, 2023, 8:30 am
by bud37
bud37 wrote:Pcmcguire wrote:Source of the post So 34gph per engine or 68gph. That does seem about right at WOT but hoping to get some feedback on rates at less than full throttle.
It is interactive.
Just click on the plus or minus under the tach and you can go up or down a few hundred rpm at a time....it shows gph in the window for one engine...make sure to pick your HP engine first.
Re: 366 fuel consumption
Posted: October 25th, 2023, 9:42 am
by buster53
I have a 356 with 8.1 Crusaders, so very close to what you have. Wish I had hard numbers to give you but I don’t…only have a feel for it. If you want long range cruising, hull speed or less, so in the 7 to 7-1/2 knot range, will give you close to double the range over18-20 knots. I find running in the 3000-3100 RPM range to be a very comfortable speed and economy, about 18-19 knots and it is just a guess on my part, but I think I am getting a little less than 1 mpg, maybe .8 MPG. This is of course, assuming you have a nice clean bottom and running gear. Doesn’t take much growth to mess with those numbers.
Re: 366 fuel consumption
Posted: October 28th, 2023, 10:57 am
by Alanna Mo Cree
I made a chart based on
https://www.boat-fuel-economy.com/new/v ... nta-375-hp and the actual speeds I was seeing on my 360. The range and endurance numbers are based on 75% of 280 gallons. None of the numbers account for generator usage. This is the raw data I captured:
Code: Select all
RPM GPH Speed MPG Range End.
600 2.16 3.2 1.5 311 97
1000 4 5.7 1.4 299 53
1500 6.8 7.4 1.1 229 31
2000 13.4 9.2 0.7 144 16
2500 20.6 11.2 0.5 114 10
3000 23 17.4 0.8 159 9
3500 29.4 24 0.8 171 7
3800 32.7 27.5 0.8 177 6
4000 36 30 0.8 175 6
4500 49.4 33.3 0.7 142 4Once I get true fuel flow data I'll be able to confirm if we really do get better economy going faster at 3800RPM than the 3000-3500RPM that seems like it should be better. We typically cruise at 1500-1700RPM, but we're not in any hurry to get anywhere.
Re: 366 fuel consumption
Posted: October 28th, 2023, 11:13 am
by bud37
Remember those interactive charts are based on hp used at x rpm therefore fuel useage to support that HP.
In real use there will be many other factors at play, for example, tides, currents, wind, sea state, canvas/boat design. So the guide numbers in the link are just that, a guide to get an idea.
Remember the accepted rule for safe fuel reserve on board.....1/3 out, 1/3 back and 1/3 in reserve....try to plan your trips accordingly.
Re: 366 fuel consumption
Posted: October 29th, 2023, 10:29 pm
by buster53
Alanna Mo Cree wrote:Source of the post I made a chart based on
https://www.boat-fuel-economy.com/new/v ... nta-375-hp and the actual speeds I was seeing on my 360. The range and endurance numbers are based on 75% of 280 gallons. None of the numbers account for generator usage. This is the raw data I captured:
Code: Select all
RPM GPH Speed MPG Range End.
600 2.16 3.2 1.5 311 97
1000 4 5.7 1.4 299 53
1500 6.8 7.4 1.1 229 31
2000 13.4 9.2 0.7 144 16
2500 20.6 11.2 0.5 114 10
3000 23 17.4 0.8 159 9
3500 29.4 24 0.8 171 7
3800 32.7 27.5 0.8 177 6
4000 36 30 0.8 175 6
4500 49.4 33.3 0.7 142 4Once I get true fuel flow data I'll be able to confirm if we really do get better economy going faster at 3800RPM than the 3000-3500RPM that seems like it should be better. We typically cruise at 1500-1700RPM, but we're not in any hurry to get anywhere.
Thanks for this. It confirms the gut feeling I have had for my 356 with 8.1’s.