2bucks
Guru
- Joined
- Oct 6, 2007
- Messages
- 698
Here is a series of pictures from my 1980 Lehman 120. Your engine may burn the same of different amounts of fuel at these rpm.
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*I toyed with taking shots of the speed to go with the gph, but with tides, boat length, clean or dirty bottom, prop size, etc.*it would be pretty difficult to get an exact match to anyone else's boat. For my 40 trawler 1750 rpm is about 7 knots, 1600 about 6.5 and 1500 about 6.1. I almost always travel with the tide, so my actual speed will be higher for each rpm range.Tony B wrote:
This is great stuff and is exactly what I have been wanting since I am in the trawler buying mode.
One more question......do you have any speed data that could be turned into MPG or any out and out MPG figures at various RPM's?
Thanks in advance
Tony B
*2bucks wrote:
*I toyed with taking shots of the speed to go with the gph, but with tides, boat length, clean or dirty bottom, prop size, etc.*it would be pretty difficult to get an exact match to anyone else's boat.
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Not to mention nicked prop, partially fouled injector, fuel leak and other gremlins that affect your gph reading. Remember, A FloScan will tell you much more than just your fuel flow but having accurate fuel flow info is enough reason to have one.
*Walt, I have*a similar*gauge as you*but it doesn't read nearly as high as 32 MPG.* We just need to look at our separate*tachometers also.SeaHorse II wrote:
2bucks:
That's about the best AD for FloScan that I've ever seen! I must admit, I like your gage much better than mine.
*Doh!2bucks wrote:
Man, I wish mine read 32 MPG. Although I'll bet you meant 32 GPH.
Ken
*In gear, cruising down the water.Darren wrote:
Are these shots taken in gear while moving or at the dock in neutral? Darren
*all i can say* is it gave me the info to help me save a little fuelnomadwilly wrote:
While you guys are roll'in around on the ground think'in how clever you are you should consider the fact that all your numbers are meaningless without knowing if Ken's boat has been propped properly. If he's overpropped even 100 rpm ...fuel burn at 1750 on your boat could be way different than his. Ken's numbers will only be valid if you're propped just about exactly the same as he is and have a boat very very similar in displacement and shape. On the bright side you can tell quite a bit about what happens to the burn rate if you increase or decrease say 100 or 200 rpm.