Fuel consumption variance

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Jorgegg
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Fuel consumption variance

Postby Jorgegg » Sun Oct 11, 2015 7:21 pm

What would cause an engine to go thru about 10% more fuel than the other? Suk's df175, equal number of hours and runed in tandem all the time. This is the second time filling the tanks with the starboard taking 10g more? They run great and I have no problems with the boat, but this is puzzling me. I appreciate any insights.

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jeff6513
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Re: Fuel consumption variance

Postby jeff6513 » Mon Oct 12, 2015 5:16 am

check your props....could of hit something?....does not take much.
I would have the motors scanned if under warranty also, if not a prop problem.
"Killin Time",.... 1999- 266 SC,Twin Yamaha F200 I4's)
Simrad AP/ Furuno 1870 /Furuno Radar

Jorgegg
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Re: Fuel consumption variance

Postby Jorgegg » Mon Oct 12, 2015 10:35 am

I'll have them checked during the 200 hr. service then. The engines only have 170 hrs. I appreciate the guidance.

Hellcat
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Re: Fuel consumption variance

Postby Hellcat » Mon Oct 12, 2015 1:24 pm

I have df140s with the same issue in the Starboard motor. Same amount even 10%. I am going to switch the lowers to see if it's the props. Also I hear could be from transducers causing turbulence or ignition system issues.

dicksboat
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Re: Fuel consumption variance

Postby dicksboat » Mon Oct 12, 2015 1:40 pm

If your engines are still under warranty, I would have your technician connect each engine in turn and do a comparison fuel flow test on the service computer at cruise rpm. If there is a measurable difference between the engines, the computer can show if an injector is staying open too long, etc.

Daybreaker
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Re: Fuel consumption variance

Postby Daybreaker » Mon Oct 12, 2015 5:44 pm

Your engine's will not burn the exact same amount.One will alaways use slightly more.On our Yamahas and our Suzukis one burns a little more.One outdrive turns a different direction than the other?When you put it on plane check your guages..Example when we're on plane ABOUT4000 rpms the port motor will say aprox.10.27 gal per hour.The starboard will say aprox.10.54..This is just an example.In a deep v you will have one or two tanks but both engine's draw from the same tanks at the same time.At the end of the day if you use 60 gallons.You really don't know that one motor might have used 32 and the other 28,because it's the same tank.On a Worldcat with separate tanks for each engine.You can really tell.I can tell by the way the boat sits in the water.Even if both fuel gauges say the same amount.If the boat lists slightly you can tell.I routinely and 10-15 gallons to one side.I have for 14 years.I don't do it every trip,but if one motor burns 3-4 gallons more a trip .After 5 trips you Will have to add a little extra on one side.I wouldn't get to worked up over it.Capt.Mike
2005 Worldcat 33TE 2008 Suzuki 300 Fly by wire,power assist steering,Raymarine evolution auto pilot,Raymarine RMK 9,C125,C95,CP570,M265,Digital radar, Viking Rescue You 8 man,ACR,Global fix,pro mariner quad charger.

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Daybreaker
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Re: Fuel consumption variance

Postby Daybreaker » Mon Oct 12, 2015 5:50 pm

Actually my Honda 130's,Yamaha 150's and the Suzuki's 300..All four stroke .One has used a little more.Capt.Mike
2005 Worldcat 33TE 2008 Suzuki 300 Fly by wire,power assist steering,Raymarine evolution auto pilot,Raymarine RMK 9,C125,C95,CP570,M265,Digital radar, Viking Rescue You 8 man,ACR,Global fix,pro mariner quad charger.

http://daybreakercharterfishing.com

SeaBiscuit
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Re: Fuel consumption variance

Postby SeaBiscuit » Tue Oct 13, 2015 7:20 pm

same as daybreaker said, one burns more than the other. On my past boat and this one, my counter rotating prop burns a little less. When livebaiting, I troll with just the counter rotating engine to make up for the extra fuel.
2008 270SF, 225 Yamaha's,Simrad NSS12-EVO2, 4G radar, B175M

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NO REGRETS
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Re: Fuel consumption variance

Postby NO REGRETS » Wed Oct 14, 2015 7:37 am

A lot of what was said is correct, I did not see where anyone included trim. Trim makes an engine run with less or more effort affecting fuel as well. If you go down to idle speed and check the burn, it is closer. The fact still remains, normally the engine trimmed lower will burn more. ;) at any given speed
X-1998 246 150 2006 SUZUKIS,3x16x20 suzuki props top speed 44 at @ 5700 rpm, HULL#84, ORIGINAL OWNER
BOYNTON BEACH,FL---

wdlfbio
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Re: Fuel consumption variance

Postby wdlfbio » Fri Oct 16, 2015 1:23 pm

I get a slight difference between my two motors. Maybe 2-3% greater burn on my port motor. Not close to your 10%
2011 290CC with twin F250s, Garmin 5212, 24HD, GHP10, and full spray curtains. Float-On HD tandem axle trailer
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