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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   New Cummins/Mercruiser Project (https://www.offshoreonly.com/forums/general-boating-discussion/196140-new-cummins-mercruiser-project.html)

Maritime_Eng 09-26-2008 01:51 PM
Originally Posted by HabanaJoe (Post 2698409)
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.

Comanche3Six 09-26-2008 04:48 PM
What transmissions and drives? Also gear ratios?
Ed

Rik 09-26-2008 05:53 PM
Originally Posted by Comanche3Six (Post 2698607)
What transmissions and drives? Also gear ratios?
Ed
NXT

LostinBoston 09-26-2008 05:59 PM
Originally Posted by tblrklakemo (Post 2698118)

Can you stagger a diesel boat......never seen it done.
Yes and its been done.

mikebrls 09-26-2008 09:09 PM
Originally Posted by Rik (Post 2698654)
NXT
OUCH

03darkshadow 09-26-2008 09:58 PM
cool, a cumminapart :drink:

tblrklakemo 09-26-2008 10:04 PM
Originally Posted by LostinBoston (Post 2698660)
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.

29Firefox 09-27-2008 04:43 AM
Another geezer's 2 cents
 
Originally Posted by HabanaJoe (Post 2698409)
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. :drink:

PatriYacht 09-27-2008 06:29 AM
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.

stainless 09-27-2008 06:32 AM
Is there more info on the engine on a mercury website somewhere?:readinghelp:


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