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Old 11-29-2020, 07:26 PM
Blackfin26 Blackfin26 is offline
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Join Date: Feb 2008
Location: Brewster, MA
Posts: 381

Great job on the project and those fuel numbers are impressive. As is 2.6 on the old 225. Best of luck with the Merc. These V8's seem like real winners!
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Old 11-30-2020, 08:25 AM
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kmoose kmoose is offline
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Join Date: Jul 2006
Location: Ocala, Florida
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Originally Posted by 77SceptreOB View Post
Thanks Ken. When I repowered with a new fuel efficient 4-stroke 300 HP motor my goal was 3.2 mpg cruise. My old 2-stroke Yamaha 225 was around 2.6. So I'm VERY happy with the ~ 3.4 mpg I'm seeing now at 30 mph cruise. That's a 30% improvement in fuel mileage vs. 2 stroke. Does that sound about right?
Yes, that seems about right and completely expected considering the tech in these new motors. I ran the numbers on my 300 after converting everything to nautical MPH and you are almost 5% better across the board in average speeds we run. Make sure to keep tabs as you start to run trips with an average fishing load as it will be interesting how the numbers hold. The Rev 4 is a great prop with lots of stearn lift and looks like a good match for your set up.

I'm not sure how it will go with Merc but my Suzuki gained fuel economy after the the beak in timers hit. I think that is when the ECM allowed the motor to go into lean burn mode. Keep us posted as you put more hours on it.
1974 23 Tsunami w/ 300 Suzuki
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Old 12-01-2020, 04:48 PM
bgreene bgreene is offline
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Join Date: Oct 2007
Posts: 377

Congratulation .....great achievement .
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Old Yesterday, 12:41 AM
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Snookerd Snookerd is offline
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Join Date: Feb 2002
Location: Bradenton, FL.
Posts: 2,589

Incredible motor! Great execution on the transom and dialing it in! Bahamas 2021!!

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