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New Cummins/Mercruiser Project

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Old 09-26-2008, 02:51 PM
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Fuel consumption averages about .36-.38 lbs per Hp hour. The GPH is based on how many horsepower your using at any given time.

The 25 GPH is close, it most likely will be as high as 28 (dyno) but that "1 GPH of diesel fuel for every 20hp" is probably more representative of what you will see in the actual boat.

Maritime_Eng - that's a very good quick little gauge of fuel consumption, thank you!
Your welcome! After three years of engine development and this is still the most useful thing I have learned.
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Old 09-26-2008, 05:48 PM
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What transmissions and drives? Also gear ratios?
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Old 09-26-2008, 06:53 PM
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What transmissions and drives? Also gear ratios?
Ed
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Old 09-26-2008, 06:59 PM
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Can you stagger a diesel boat......never seen it done.
Yes and its been done.
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Old 09-26-2008, 10:09 PM
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NXT
OUCH
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Old 09-26-2008, 10:58 PM
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cool, a cumminapart
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Old 09-26-2008, 11:04 PM
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Yes and its been done.
ok, dumb question. I've just never seen it...even on boats that are always staggard gas setups.

Sure would be neat to have a diesel speed boat that sounded like a loud pipe peterbilt.
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Old 09-27-2008, 05:43 AM
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Originally Posted by HabanaJoe View Post
Fuel consumption averages about .36-.38 lbs per Hp hour. The GPH is based on how many horsepower your using at any given time.

The 25 GPH is close, it most likely will be as high as 28 (dyno) but that "1 GPH of diesel fuel for every 20hp" is probably more representative of what you will see in the actual boat.

Maritime_Eng - that's a very good quick little gauge of fuel consumption, thank you!
Joe wassup! Now the top end may be 500 ponies your not gonna cruise with the sticks jammed wide open. For cruise your gonna back it off to a tad under 3200 rpm. Went through the data captures on my laptop. Found one for a QSB 480 cruising at 3175 rpm it was sucking up 20.3 gph.
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Old 09-27-2008, 07:29 AM
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So at 60+ mph it would get about 1.6 - 1.8 mpg. Not bad. My Black Thunder at the same speed gets about 1.0 and I always thought that was pretty good for a boat that size.
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Old 09-27-2008, 07:32 AM
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Is there more info on the engine on a mercury website somewhere?
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