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Old 04-16-2014, 08:17 AM   #41
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We too have just installed a Maretron N2K system on four flat screens. We are monitoring weather, GPS, depth, AC/DC, tankage, raw water flow, EGT, engine data, AIS, fuel filter vacuum, bilge water level, engine room temperature, vessel attitude, etc. We chose not to monitor fuel flow because we have heard the fuel flow monitors have an accuracy issue with low GPH engines like our Yanmar 4JH3-TEs. We instead chose to monitor fuel filter vacuum to be forewarned of fuel filters becoming clogged.

The only real hangup we have had is getting the engine oil pressure monitor to read accurately (it is showing 80 lbs at 2800 RPM 40lbs at idle). And finding the appropriate sender for exhaust gas temperature (we want to measure exhaust hose temperature on the outside of the hose rubber hose so the sender is not exposed to the exhaust gas stream).

Has anyone experienced this and found a fix for the oil pressure gauge or EGT temp sender?


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Old 04-16-2014, 09:38 AM   #42
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Spottsville:

There was no issue with measuring fuel flow on my Yanmar 4LHAs.

At idle the in fuel is about 8 gph, out about 7.5. Net fuel burn .5 gph.
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Old 04-16-2014, 06:54 PM   #43
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Thanks, may add fuel flow too!
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Old 04-16-2014, 07:02 PM   #44
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My Yanmar 3GM30 was showing a low of 0.1- 0.2 gph fuel burn before the raw water impeller let go during a test run. I don't think it reads much lower than that. The senders were rated at 0.5 -26 gph. Should handle a 4 cyl engine just fine.
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Old 04-16-2014, 11:46 PM   #45
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Two engines one unit?

I have two Flowscans on a twin engine boat now, and they drive me crazy because they never agree with each other. I would prefer, on another boat, just to install a Maretron unit on one engine and multiply the net flow by two. Does anyone know whether the Maretron software and/or calibration procedure will allow me to do this?
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Old 04-17-2014, 06:07 AM   #46
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and they drive me crazy because they never agree with each other.

WHY would you think they should?
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Old 04-17-2014, 07:22 PM   #47
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I have two Flowscans on a twin engine boat now, and they drive me crazy because they never agree with each other. I would prefer, on another boat, just to install a Maretron unit on one engine and multiply the net flow by two. Does anyone know whether the Maretron software and/or calibration procedure will allow me to do this?
Seems to me that they are doing their job and providing you information about the condition of the engines.

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Old 04-17-2014, 08:04 PM   #48
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One of them has to be wrong!

Since I installed the Floscan's several years ago, they have never read consistently. I am not talking about 5-10%, which I could live with. I am talking 50-100%. Sometimes the port engine is higher, sometimes the starboard. Small amounts of air, not enough to cause grief to the engines, will make them go haywire.

The major purpose of these things is to keep the throttle back where it belongs. For that, one is sufficient. Two is merely a distraction. In fact, if I had it to do all over again, I would probably post the engine fuel consumption chart right next to the throttles and be done with it.

So, they really don't tell you the "condition of the engines." They tell you the condition of the Floscans and the position of the throttle.

It is a nice luxury to have a realtime picture of gallons per mile, but for that one measurement instrument times two seems sufficient for me.
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Old 04-18-2014, 06:18 AM   #49
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Small amounts of air, not enough to cause grief to the engines, will make them go haywire.

Fix the boat.
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Old 04-23-2014, 06:08 AM   #50
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Recently, my Maretron system indicated I was burning 50% more fuel on the starboard engine. Really odd when both engines were doing the same RPM's. Immediately thought fuel was spewing into the bilge. Couldn't find a leak anywhere and no smoke.
Short story - Turns out that my starboard tacho was failing/losing calibration and it was 200RPM's out from the port engine.
Having 1 is cheaper up front, but having 2 means knowing exactly what is going on with both engines and keeping fuel burn under control.
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Old 04-23-2014, 07:37 AM   #51
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verification

"Sometimes the port engine is higher, sometimes the starboard"

So how do you decide which one to keep? They both are telling you the same inconsistent story. Which I think tells you something else.
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Old 04-23-2014, 07:44 AM   #52
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Recently, my Maretron system indicated I was burning 50% more fuel on the starboard engine. Really odd when both engines were doing the same RPM's. Immediately thought fuel was spewing into the bilge. Couldn't find a leak anywhere and no smoke.
Short story - Turns out that my starboard tacho was failing/losing calibration and it was 200RPM's out from the port engine.
Having 1 is cheaper up front, but having 2 means knowing exactly what is going on with both engines and keeping fuel burn under control.

So what was the fix to bring the tach back to normal?




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Old 04-23-2014, 07:03 PM   #53
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So what was the fix to bring the tach back to normal?




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We confirmed the problem by using a laser tach. Then by setting both engines at the same RPM's with the laser tach whilst underway, we saw that the fuel burn was very similar for both engines across the rev range.
200rpm's does not seem much to a noob like me but on our CAT3208AT's it makes a huge difference to the fuel burn in certain conditions. 1 motor at hull speed - the other trying to push it over the hump.
My point in this waffle is that the fuel flow monitoring does tell you the fuel burn on both motors - but this information also lets you know of any other issues that may be present - ie inaccurate tach in my case.
If people only install 1 monitoring unit they may still unknowingly burn many $$$$ of excess diesel on the unmonitored engine if they had a similar fault to mine. Assuming they manually check their tank levels at the end of each day they will not know they have a problem until they reach their anchorage.
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