Rpms
- Thread starter KEVMAR
- Start date
The friendliest place on the web for anyone who enjoys boating.
If you have answers, please help by responding to the unanswered posts.
If you have answers, please help by responding to the unanswered posts.
jleonard
Guru
- Joined
- Jun 25, 2008
- Messages
- 5,063
I usually run 1650 to 1750 and get roughly 6.5 knots in no current.
I have been known to run 1900 at times, but I prefer to keep the rpms down.
Not a fuel thing for me as there's not enough difference to even consider, just thinking longevity.
I have been known to run 1900 at times, but I prefer to keep the rpms down.
Not a fuel thing for me as there's not enough difference to even consider, just thinking longevity.
High Wire
Guru
Should have room for another 100 to 200. Wont hurt to try it.
Make a simple rpm/speed table 100 rpm increments. When you get to where 100 rpm boost only raises speed 0.1 knot, no point in going further.
Make a simple rpm/speed table 100 rpm increments. When you get to where 100 rpm boost only raises speed 0.1 knot, no point in going further.
Pete Meisinger
Guru
- Joined
- Oct 7, 2012
- Messages
- 3,145
- Location
- USA
- Vessel Name
- Best Alternative
- Vessel Make
- 36 Albin Aft Cabin
I always ran at 1750, doing about 7 - 8 kn. I met another owner with a basically identical boat, He said he runs his W.O.T., up around 2,400, close to 10 knots. American Diesel seems to agree with him. He said it improves speed and barely changes mpg which is so high anyway that what difference does does it make if it's a little worse. I get about 1 to 1.5 gls per hour which translates to around 4 -5 mpg. My problem is not burning enough fuel to keep it fresh, maybe this year, now that I am retired...
Ski in NC
Technical Guru
Second post #5. Start at 1200 and write down speed. Go up 50 or 100rpm and write down speed. Somewhere around 7-8kts an additional 50rpm will net almost zero speed increase. Your optimal rpm will be like 100rpm below.
16, 17, 1800 are all within the happy spot for that motor.
I would not recommend running it at full power continuously (post #6). It's a tough engine, but not that tough.
16, 17, 1800 are all within the happy spot for that motor.
I would not recommend running it at full power continuously (post #6). It's a tough engine, but not that tough.
swordfish
Senior Member
33 ft boat
120 ford bowman
cruising speed
1350 rpm
5.5/6 knots (no current)
max speed
2000rpm
8 knots
120 ford bowman
cruising speed
1350 rpm
5.5/6 knots (no current)
max speed
2000rpm
8 knots
