Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

[Jasonc43]

Hi there - we're looking to get back in to boating now the kids are a little older!! i have the opportunity to buy (on a really good deal!) an old but very tidy 1994 Rinker 260. its running a Merc 5.7 Bravo, assuming all is well for it's age, has anyone got any estimated consumption figures for a boat this size running that engine set up - the boat weighs in at around 6100lbs! any guidance much appreciated. all the best, Jason.

 

[achris]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

That is an awful lot of boat for that engine. Most boats that size have around 350-400hp across 2 engines, not 250hp from a single. I would be budgeting around 30-35 litres per hour at cruising speed (which is not going to be too quick either).... and as high as 75lph at WOT....

 

[MarkSee]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

....any guidance much appreciated....

Welcome to IBOATS

As Chris mentioned, that's under powered and should have a 7.4/454 like Sea Ray 260's and my 270 does--minimum.

Since you're looking for guidance, if you're worried about spending money on fuel consumption then you might want to consider a smaller boat that is very thrifty at the pump then trade up when the time is right to spend $100-200+ every trip.

Mark

 

[beermak]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

I have a 25ft which weighs 3,5 tons. its powered with a 350 rated at 290hp. Running steady at 3200rpm uses 40 45 litres an hour (11 gals aprox)

 

[tazrig]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

I have a 25ft which weighs 3,5 tons. its powered with a 350 rated at 290hp. Running steady at 3200rpm uses 40 45 litres an hour (11 gals aprox)

Just curious is that a fuel injected engine or a carbureted one and I/O or inboard?

 

[achris]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

....its running a Merc 5.7 Bravo.........

Just curious is that a fuel injected engine or a carbureted one and I/O or inboard?

"Bravo" makes it an I/O... and if the manufacturer/dealer has gone to such a small engine in that boat, probably to make it 'affordable', then I would doubt it is Injected....

JMO

Chris......

 

[tpenfield]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

Since it is small engine for that size/weight of boat . . . it will use a lot of gas . . . maybe 2 mpg at best.

 

[tazrig]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

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"Bravo" makes it an I/O... and if the manufacturer/dealer has gone to such a small engine in that boat, probably to make it 'affordable', then I would doubt it is Injected....

JMO

Chris......

I know the OP has a Bravo I/O but Beermak didn't mention what type of set up he had only that he burned 11 gallons an hour in a 25 foot boat that weighed 7,000 lbs. which sounded a bit off so I was curious as to what set up he had.

 

[beermak]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

Its an 1980 vp 290a with a 280. Its a 4bbl rochester feeding

I tested 2 weekends ago with a full tank of 300 litres of gas, 50 l of water and 3 on board.

Tested 45 min each way up river and down river going 3200 3300 almost all trip.

68 litre at the pump and bruned and 5 large notes

 

[HT32BSX115]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

I have a 25ft which weighs 3,5 tons. its powered with a 350 rated at 290hp. Running steady at 3200rpm uses 40 45 litres an hour (11 gals aprox)

Howdy,

And by comparison, I have a 21ft Four Winns that weighs approx 5500lbs loaded with fuel and 5 people.

When cruising (30 mph) at 3000 RPM I burn 10 gallons per hour.

[carbureted, 454 cu-in Mercruiser, 300 prop-shaft HP, Bravo III]

Cheers,


Rick

 

[Friscoboater]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

Man that boat has got to be a dog out of the hole, and use a ton of fuel. Even with my 4400 pound 22ft sea ray I would not have anything else besides a 454.

I am of the belief that you cannot worry about fuel when boating. If you do, get rid of the boat.

 

[achris]

Re: Mercruiser 5.7 V8 Bravo 1994 Fuel consumption

If we're posting up consumption figures, here's mine... 17" 'Vengance' SS prop... Boat in signature...

The pink line is litres/hour
The blue line is speed in knots
The yellow line is the result of integrating them, litres/nautical mile...