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What's the GPH on a Merc 850sci

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Old 12-05-2009, 01:36 PM
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62 gal/hr at constant 850 output is around 0.45 BSFC assuming 6.2 lbs/gal fuel density.
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Old 12-05-2009, 01:55 PM
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62 gal/hr at constant 850 output is around 0.45 BSFC assuming 6.2 lbs/gal fuel density.
exactly what we had figured, and the fuel can vary from 6.0-6.3 depending on region of the country as well.
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Old 12-05-2009, 02:11 PM
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So how would you convert the 60 GPH to miles per gallon(mpg)?

I'm guessing .82 mpg??

Sean/guys do you all calculate mpg in the race boats?

Thanks for all the info
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Old 12-05-2009, 02:21 PM
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.75-.85 probably, really don't calculate that.... obviously would be effected by pace laps, milling, etc... we base fuel off of lap time and laps (total time of race).

Actually we do it more by weight over time to make sure we don't come in light. Cant burn more than 800 lbs or we will be trouble. Usually come in a little heavy which is a good thing. Those scales aren't always the most accurate, so you want a couple hundred lbs on your side.
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Old 12-05-2009, 02:31 PM
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.75-.85 probably, really don't calculate that.... obviously would be effected by pace laps, milling, etc... we base fuel off of lap time and laps (total time of race).

Actually we do it more by weight over time to make sure we don't come in light. Cant burn more than 800 lbs or we will be trouble. Usually come in a little heavy which is a good thing. Those scales aren't always the most accurate, so you want a couple hundred lbs on your side.
when did you join a race team??
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Old 12-05-2009, 02:53 PM
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when did you join a race team??
been helpin out the 850 fury boat for the last year and half or so... been doing the race thing for nearly 10 years now, you need to keep up better.
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Old 12-05-2009, 03:44 PM
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been helpin out the 850 fury boat for the last year and half or so... been doing the race thing for nearly 10 years now, you need to keep up better.
it appears so........
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Old 12-05-2009, 06:11 PM
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What about a 1075sci on GPH? Anybody know?

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Old 12-05-2009, 08:55 PM
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and my notes from Merc say 62 gph for the race 850.
Dumb question here (I don't really follow/read up on all the rules for different racing classes), when you say race 850, you mean just data you have logged from racing, not that there is a pleasure 850 and a race 850 for some reason (rules)?
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Old 12-05-2009, 09:05 PM
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Cat, V or cruiser, does not really matter that much.

For a given engine, if you make constant HP, for a specific period of time, you will burn relatively the same amount of fuel, in any boat. Weather we speak in terms of megajoule (MJ), or British thermal unit (BTU), a gallon of 93 gasoline, has a constant energy content, and can produce a specific amount of HP, in a given engine, regardless of the work the engine is doing. Remember 1 mechanical HP is equal to 550 foot-pounds per second, which is approximately equivalent to 745.7 watts, at does not matter how they are used, they take the same energy to produce.

If you run WOT for a specific period of time, the same engine in the cat, will get farther than the V, and the V will get father than the cruiser, but they will all burn virtually the same amount to fuel.
great information and makes lots of sense
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