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Old 08-27-2011, 02:24 PM   #1
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Lehman 120 FloScan readings

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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Old 08-27-2011, 02:31 PM   #2
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RE: Lehman 120 FloScan readings

A few more

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Old 08-27-2011, 03:11 PM   #3
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Lehman 120 FloScan readings

2bucks,

YOU ARE THE MAN!! I've got some of this stuff wrote down here and there but now it's always a click away!

THANKS!!


-- Edited by Daddyo on Saturday 27th of August 2011 06:49:34 PM
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Old 08-28-2011, 06:58 AM   #4
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RE: Lehman 120 FloScan readings

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
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Old 08-28-2011, 10:07 AM   #5
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RE: Lehman 120 FloScan readings

2bucks
great info have those readings been consistent for you At what rpm do you cruise at? THANKS
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Old 08-28-2011, 10:08 AM   #6
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Lehman 120 FloScan readings

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.


-- Edited by SeaHorse II on Sunday 28th of August 2011 10:12:45 AM
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Old 08-28-2011, 10:47 AM   #7
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RE: Lehman 120 FloScan readings

Quote:
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
*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.

I've been out for almost 3 months right now and have been doing most cruising at 1500 - 1550 just because I'm in no hurry. If I'm facing a 40 mile trip that I'm going to make in one shot, then I'll kick it up to 1750.
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Old 08-28-2011, 11:11 AM   #8
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RE: Lehman 120 FloScan readings

Put em on a graph guys.* I won't bother posting the graph because its easy to DIY but its a really good curve, increasing consumption at higher RPM - exactly what you would expect.
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Old 08-28-2011, 04:31 PM   #9
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RE: Lehman 120 FloScan readings

Quote:
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.

__________________________________________________ _____________

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.
*
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Old 08-28-2011, 08:59 PM   #10
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Lehman 120 FloScan readings

Quote:
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.
*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.



*


-- Edited by markpierce on Sunday 28th of August 2011 09:01:37 PM
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Old 08-28-2011, 10:12 PM   #11
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RE: Lehman 120 FloScan readings

Man, I wish mine read 32 MPG. Although I'll bet you meant 32 GPH.

Ken
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Old 08-28-2011, 11:23 PM   #12
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RE: Lehman 120 FloScan readings

Quote:
2bucks wrote:
Man, I wish mine read 32 MPG. Although I'll bet you meant 32 GPH.

Ken
*Doh! * That's the second time in a week I've made a fool of myself.
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Old 08-31-2011, 01:06 PM   #13
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RE: Lehman 120 FloScan readings

Are these shots taken in gear while moving or at the dock in neutral?
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Old 08-31-2011, 03:23 PM   #14
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RE: Lehman 120 FloScan readings

Quote:
Darren wrote:
Are these shots taken in gear while moving or at the dock in neutral? Darren
*In gear, cruising down the water.
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Old 09-01-2011, 12:24 AM   #15
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RE: Lehman 120 FloScan readings

I have been considering Flo Scans, but as I have twins (engines that is)*sucking fuel from*a fuel manifold that serves*both mains + generator there seems to be no way I could calibrate them properly.

Any smart ideas guys?*
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Old 09-01-2011, 04:17 AM   #16
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RE: Lehman 120 FloScan readings

After the supply manifold the sender for each engine is installed.

Before the return is joined to a common return the other sender is installed.

No problem, just paying for 2 systems.

I have long thought that some of the Bosch style injection systems , those that return almost nothing, could use a gas engine system.

Some injection returns basically just return internal leakage , the error would not be meaningful.
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Old 09-01-2011, 11:02 AM   #17
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RE: Lehman 120 FloScan readings

Check out the FloScan web site for installations with twins. IIRC you have the choice of one guage with a switch to look at each engine seperately, or a guage with two readouts.

The sensors for flow need to be installed past where the supply line splits to go to each engine so you can monitor each engines performance seperately. Depending on your engine room, you might want mount the sensors and pulse dampners remotely and then replumb the supply line to the engine rather than trying to find real estate right at the engine.

Ken
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Old 09-10-2011, 07:58 PM   #18
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RE: Lehman 120 FloScan readings

Very interesting, really impressed with fuel burn at lower RPMs.

Thanks Ken for posting these images.

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Old 10-23-2011, 04:30 PM   #19
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RE: Lehman 120 FloScan readings

ok so I have been on the icw for a week now Fueled up today. dropping my RPM to 1600 from 18oo changed my gph from 2.3-2.5 to 1.75 thanks again
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Old 10-23-2011, 05:31 PM   #20
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RE: Lehman 120 FloScan readings

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.
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