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15-08-2011, 14:07
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#1
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Registered User
Join Date: Dec 2006
Boat: Looking for a new boat
Posts: 2,552
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Gallons / Hour Discussion
How many gallons per hour does your engine get?
I will start!
I have a 325Hp Isuzu
pushing a 34 ft 10 ton boat at 13.5 knots I get approximately 4 Gal/hr.
I used to live on a boat with a Yanmar I think it was a 3gm30f propelling a 10 ton 38 ft hull at appx 6knots I think we would get appx .5 gal/hr. Does that sound right or am I dreaming?
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15-08-2011, 14:16
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#3
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cat herder, extreme blacksheep
Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 18,967
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Re: Gallons per hour discussion
my formosa uses approx .8 gal per hour. i have a perkins 4-108. i run it at approx 2200-2500 rpm and attain 5-6 kts without breezes. with breezes, she gets more efficient, as i turn off the engine and run with the wind.
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15-08-2011, 14:19
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#4
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Registered User
Join Date: Oct 2008
Location: Northern British Columbia, part of the time in Prince Rupert and part of the time on Moresby Island.
Boat: 50-ft steel Ketch
Posts: 1,884
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Re: Gallons per hour discussion
I get about .7 to .8gph with my OM636 diesel without pushing it into the red, so the .5 sounds in the ball park
__________________
'Tis evening on the moorland free,The starlit wave is still: Home is the sailor from the sea, The hunter from the hill.
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15-08-2011, 14:20
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#5
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Registered User
Join Date: Oct 2005
Posts: 6,185
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Re: Gallons per hour discussion
~1 gallon/hour at cruising speed. 52 horse yanmar, big heavy keel.
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15-08-2011, 14:21
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#6
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Registered User
Join Date: Aug 2007
Location: Clear Lake Marine Services - Seabrook, Texas
Boat: Gulfstar, Mark II Ketch, 43'
Posts: 2,359
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Re: Gallons per hour discussion
About the same as Zee, pushing UD @ 6 kts..
Perkins 4-108, 50 HP.
__________________
Formerly Santana
The winds blow true,The skies stay blue,
Everyday is a good day for SAILING!!!!
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15-08-2011, 14:23
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#7
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Registered User
Join Date: Apr 2011
Location: Satellite Beach Florida
Boat: Bruce Roberts 434
Posts: 716
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Re: Gallons per hour discussion
Heavy displacement boat 16 tonnes with 4-108 I burn about .75 gals an hour at 6 knots, if I have wind indefinite the tank never goes down haha
__________________
Capttman
"When the bow be in the trees we'll be running out of seas"
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15-08-2011, 14:24
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#8
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cat herder, extreme blacksheep
Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 18,967
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Re: Gallons per hour discussion
capttman --we have similar fuel consumption..mine wasnt worked on mathematical skills but guestimations. LOL.
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15-08-2011, 14:30
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#9
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Registered User
Join Date: Apr 2011
Location: Satellite Beach Florida
Boat: Bruce Roberts 434
Posts: 716
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Re: Gallons per hour discussion
Quote:
Originally Posted by zeehag
capttman --we have similar fuel consumption..mine wasnt worked on mathematical skills but guestimations. LOL.
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Yes we do Zee.. same engine and what do you weigh? 
__________________
Capttman
"When the bow be in the trees we'll be running out of seas"
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15-08-2011, 14:34
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#10
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CLOD
Join Date: Jul 2007
Location: being planted in Jacksonville Fl
Boat: none
Posts: 20,415
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Re: Gallons per hour discussion
54 HP Yanmar on my Hunter 410 and I use about .5 gph at 5 knots boat speed at around 1400 rpm
__________________
Don't ask a bunch of unknown forum people if it is OK to do something on YOUR boat. It is your boat, do what you want! 
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15-08-2011, 15:24
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#11
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Registered User
Join Date: Sep 2008
Location: Western KY
Boat: Morgan 321, BELIEVE
Posts: 203
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Re: Gallons per hour discussion
My Yanmar 3GMD running at 2000 rpm gets about 0.5 gal / hr.
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15-08-2011, 16:23
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#12
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Registered User
Join Date: Jul 2009
Location: Lviv, Ukraine
Boat: Ohlson 38
Posts: 691
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Re: Gallons per Hour Discussion
I think something must be seriously wrong with mine. I have a Yanmar 20ymsomething with roughly 1000 hours on it, I run it at 26-2800 rpms and I use 1.5 gallons/ hour! It runs great just burns a lot of fuel. Could a feathering prop cause such a large increase in fuel consumption?
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15-08-2011, 16:27
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#13
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Registered User
Join Date: Feb 2011
Location: Palm Beach and the Conch Republic
Boat: Gibson 50', Columbia 8.3, Harbor 20, Hunter 14, Trac 16, Several Lasers
Posts: 308
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Re: Gallons per Hour Discussion
.33 to .5 gph with a Yanmar 2QM pushing 27' at 8500 - 9000 lbs.... I think I've used 20 gallons over the past 8 months...
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15-08-2011, 16:32
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#14
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Registered User
Join Date: Jan 2010
Location: 3rd wave passed the sea wall
Boat: private yacht always moving
Posts: 1,388
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Re: Gallons per hour discussion
Quote:
Originally Posted by capttman
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YOU NEVER ask a women what she weighs 
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15-08-2011, 17:00
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#15
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Registered User
Join Date: Oct 2010
Location: Md, USA
Posts: 433
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Re: Gallons per Hour Discussion
Yanmar 4gm... 54HP .7GPH @2700RPM 19000LB 43 Bene
__________________
ShaunJ
I get knocked down...But get up again...
You're never going to keep me down....
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