at what price do you stop boating
08-25-2005 | 02:59 PM
#91
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Joined: Mar 2003
Posts: 1,044
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From: Montreal,Quebec
Re: at what price do you stop boating
Originally Posted by Chris288
Stock 496 H.O. At cruise burns about 35 gph @ 4,000 rpm, at WOT, 5,000 rpms it burns about 45-50
The following test data where provided within a test of a 25 outlaw with a 496HO: 31.7 GPH at 4800 RPM'S
RPM MPH Knots Total GPH MPG NMPG Range NM
700 4.3 3.7 1.5 2.93 2.55 251 218 69
1000 6.7 5.8 2.5 2.71 2.36 232 202 67
1500 8.5 7.3 4.1 2.09 1.81 178 155 77
2000 9.2 8.0 6.2 1.48 1.29 127 110 77
2500 24.4 21.2 8.4 2.92 2.54 249 217 81
3000 28.8 25.0 10.7 2.69 2.34 230 200 86
3500 41.1 35.7 15.3 2.69 2.34 230 200 89
4000 55.0 47.8 21.0 2.63 2.28 224 195 90
4500 60.8 52.9 30.2 2.02 1.75 172 150 93
4800 65.6 57.0 31.7 2.07 1.80 177 154 93
I hope it makes you happy
Keep smilling 
till it get's to 4$ a gal 
Last edited by JS232; 08-25-2005 at 03:02 PM.
08-25-2005 | 06:09 PM
#93
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Joined: Mar 2003
Posts: 1,044
Likes: 1
From: Montreal,Quebec
Re: at what price do you stop boating
Originally Posted by Chris288
Dave, I saw your #'s in another post and your doing phenominal...
Merc's general rule of thumb is H.P. / 12 = gph @ 80% throttle. which in my case works out to 425 / 12 = 35 @ 4,000 and thats about exactly where i'm at... WOT is 5,000 and im guestimating aroung 45 gph.. which seems about right for my 288.. I don't have a flow scan but at 3,800 I have heard my hull gets approx. 2.5 mpg.
Merc's general rule of thumb is H.P. / 12 = gph @ 80% throttle. which in my case works out to 425 / 12 = 35 @ 4,000 and thats about exactly where i'm at... WOT is 5,000 and im guestimating aroung 45 gph.. which seems about right for my 288.. I don't have a flow scan but at 3,800 I have heard my hull gets approx. 2.5 mpg.
I think that the Merc rule you are reffering to applys to Carb engines. I am not an expert but I have read many times and I believe that MPI engines burns 20-30% less fuel than carb ones. Down side of MPIs is when you break, it's a $%? head ache to fix. Sensor for this, sensor for that... All those tiny cute sensors and computers that allow your engine building the perfect mix of air, fuel ratio...
08-25-2005 | 06:10 PM
#94
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Joined: Mar 2003
Posts: 1,044
Likes: 1
From: Montreal,Quebec
Re: at what price do you stop boating
Originally Posted by Chris288
Dave, I saw your #'s in another post and your doing phenominal...
Merc's general rule of thumb is H.P. / 12 = gph @ 80% throttle. which in my case works out to 425 / 12 = 35 @ 4,000 and thats about exactly where i'm at... WOT is 5,000 and im guestimating aroung 45 gph.. which seems about right for my 288.. I don't have a flow scan but at 3,800 I have heard my hull gets approx. 2.5 mpg.
Merc's general rule of thumb is H.P. / 12 = gph @ 80% throttle. which in my case works out to 425 / 12 = 35 @ 4,000 and thats about exactly where i'm at... WOT is 5,000 and im guestimating aroung 45 gph.. which seems about right for my 288.. I don't have a flow scan but at 3,800 I have heard my hull gets approx. 2.5 mpg.
I think that the Merc rule you are referring to applies to Carb engines. I am not an expert but I have read many times and I believe that MPI engines burns 20-30% less fuel than carb ones. Down side of MPIs is when you break, it's a $%? head ache to fix. Sensor for this, sensor for that... All those tiny cute sensors and computers that allow your engine building the perfect mix of air, fuel ratio...
08-25-2005 | 08:30 PM
#95
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Joined: Jul 2005
Posts: 56
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Re: at what price do you stop boating
I just bought my 38' Scarab kv and I get less than 1mile to a gallon(car borated 496's) last poker run for the year this weekend then it's rafting time.Good thing the best spot on our lake to swim and party and everyone goes to is 60 second from my dock.I'm paying $2.88 a gallon 204 gallons to fill and rising every day.I will always have my boat but think how I drive for now on! this SUCKS!
08-25-2005 | 09:07 PM
#96
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Joined: Jun 2004
Posts: 476
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From: Wichita, KS
Re: at what price do you stop boating
Originally Posted by JS232
I think that the Merc rule you are referring to applies to Carb engines. I am not an expert but I have read many times and I believe that MPI engines burns 20-30% less fuel than carb ones. Down side of MPIs is when you break, it's a $%? head ache to fix. Sensor for this, sensor for that... All those tiny cute sensors and computers that allow your engine building the perfect mix of air, fuel ratio...
I'd believe 20-30% less in a car which has a very broad range of both load and rpm. But a boat's load-rpm relationship is much tighter and skewed towards the higher loaded end of things. Therefore there isn't as much opportunity for fuel savings.
20-30% fuel saving on an engine is enormous.
