Was wondering if there is a cruising rpm point that would provide the most efficient fuel consumption, knowing that there are a number of variables that impact this. Have a 25' C/C with gas 8.1 Volvo. Thanks....
Announcement
Collapse
No announcement yet.
Most efficient RPM's for 8.1- 25'
Collapse
X
-
I can't give you any factual numbers on this. While researching the boat I did come across some fuel burn numbers for a Crusader 8.1 in a comparable boat (can't recall the boat anymore). Crusader is the same basic engine. I doubt Volvo fuel burn would be significantly different. FWIW, here are the numbers.
RPM GHP
3000 12
3400 15
3600 18
4200 28
4550 35 (Volvo max 4400rpm)
I'm running C-5 stainless props on my boat in fresh water. There seems to be a sweet spot between 3400 and 3600 rpm where the boat is moving very nicely and the engine seems in a groove. I think at 3600rpm that I'm right at 30 knots (gps). Need to spend some time to build myself a chart showing rpm and boat speed then refer it back to these fuel burn numbers. Hope this helps.--Mike
2004 Carolina Classic 25 - Little Dandy
Volvo 8.1 DuoProp
ocimaya.org
-
-
--Mike
2004 Carolina Classic 25 - Little Dandy
Volvo 8.1 DuoProp
ocimaya.org
Comment
-
Comment