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gph conversions etc.?

Old 02-25-2011, 02:50 PM
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Here's a list of GPH I recorded in a 22' Stoker with a 502/500HP with 5 people aboard:

That's as far as I went. From there up, it was already tuned for 12.8-13.0 air/fuel.

The rule of thumb I use is 1 GPH per 10hp.
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Old 02-25-2011, 05:12 PM
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Originally Posted by fossilx View Post
I like to be 100% educated on ALL my purchases, I want to make sure I get 100% accurate information, the more people that chime in, the more accurate the info will be.
Whenever this topic comes up people always say that gas is the cheapest part of boating, etc. Sure, that's true. But there is nothing wrong with analyzing fuel consumption for a few reasons.

Having a ballpark idea of how much fuel a boat uses BEFORE buying it is a good idea.

NOT running out of gas. Gas guages aren't very accurate. Some don't buy the GPH thing, but when I went to the gas station, I could look at my hr. meter and know within a few gallons how much to fill.

Determiing optimal cruising speeds.

Smartcraft or Diacom software is great for these purposes.
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Old 02-28-2011, 08:42 AM
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what about going slow thru no wake zones.. what should I achieve with the following set-ups?

Baja 272 with 502
Fountain 35' with twin 496, 500, or 502
Fountain 38' with twin 496, 500, or 502
Fountain 42' with twin 496, 500, or 502
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Old 02-28-2011, 10:19 PM
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Smartcraft or Diacom software is great for these purposes. [/QUOTE]

Add one more to dave m's list. Lowrance also has chartplotters and gauges compatible with their fuel flow senders for instant gph, mpg, fuel remaining, fuel used, etc
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Old 02-28-2011, 11:43 PM
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Originally Posted by fossilx View Post
what about going slow thru no wake zones.. what should I achieve with the following set-ups?

Baja 272 with 502
Fountain 35' with twin 496, 500, or 502
Fountain 38' with twin 496, 500, or 502
Fountain 42' with twin 496, 500, or 502
Now would this be heading into the wind or with a cross wind?

I want to make sure my calculations are correct.
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Old 03-01-2011, 06:15 PM
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Outboards use 10% of h.p. @ WOT... 300 h.p. = 30 gph @ WOT "HIGH LIFE"
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