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Old 09-05-2022, 08:15 PM   #1
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Default After 22 years and lots and lots of hours time to have the repower talk...

Nobody wants to talk about it but it has to be done when it has to be done.
Time to replace the venerable Mercury 300hp 350 mag MPI's.
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Old 09-05-2022, 08:18 PM   #2
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Default This is gonna leave a financial mark!!

The old girls served us very well. Blown head gasket from corrosion on port engine.
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Old 09-05-2022, 08:29 PM   #3
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Default When it comes to horsepower and boats we made the only logical choice...

More, is BETTER! After discussing all of our options and what we wanted out of a repower, we went with the Mercury Reman 383 Stroker MAG MPI's. 350 HP ea. With just about 400 pounds feet torque. The motors are amazing and Mercury Smart Craft equipped which gives you all the engine vital statistics on your cell phone real time with Mercury Vessel View Mobile app. With the extra horsepower and torque the boat leaps out of the water now on launch. :-)
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Old 09-05-2022, 11:10 PM   #4
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Yes all boats need to be repowered at some time. Great choice on the repower thatís what I would have went with for your boat.
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Old 09-07-2022, 03:08 AM   #5
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Do not want to think about it seriously for a while, but the extra hp sounds fun!

What outdrive and did you change pitch? We have Bravo 2 and our 19 pitch props were dinged up pretty good. I did not want any down time while being rebuilt so bought what I could get my hands on immediately, which happened to be 23. I was kind of surprised how well it still came out of the hole, but max rpm was down about 300. I would think they would be perfect for your new power!

Enjoy!
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Old 09-07-2022, 03:00 PM   #6
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Default Repowering = B.O.A.T. ◊ 32 then, ◊ 42 now!

Yeah spending $32k to repower will raise an eyebrow or two with the wifey! Lol! This repower was actually one year ago. Sadly with 40 year record high Bidenflation included, the same complete motors from Mercury are now $5k more than they were before, which would bring current repowering total to a whopping $42k with installation labor! We feel very lucky we pulled the trigger when we did!

As far as the Bravo III outdrives, they were gone through completely at that time and no gearing changes were made. I'm not sure about the OD gear ratio we have, it's the standard for the power package we had. As far as performance, the boat cruises at 36 miles per hour at 3800 RPM. WOT is 5000. Which is right in the sweet spot of the motors intended max RPM operating range of 4800 to 5200. So the stock OD gearing and 22" pitch screws are matched perfectly. Since these motors are Smart Craft equipped, I have instant fuel consumption on my cell phone. Cruise Fuel burn has improved by an incredible 10%, to 1.3 GPM which is considerable because these motors are higher displacement From 5.7l to 6.3l. One final note, these motors are designed to run on regular gas and still put out their rated 350 horsepower and 400 foot pounds torque with Mercury's anti-knock control. I'm almost tempted to try a tank of premium gas to see what she'll do then? :-)

Couldn't be happier, my hats off to the engine builders at Mercury. They breathed improved life into my to our wonderful Maxum cruiser.
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Old 09-08-2022, 10:48 PM   #7
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Default A 350 block with a 400 crank; what a concept!💡

The Mercury 383 MAG Stroker Bravo MPI Specifications.
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Old 09-17-2022, 05:44 AM   #8
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Old 09-17-2022, 06:32 AM   #9
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Bella Sera Over and OUT
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Old 09-19-2022, 02:20 PM   #10
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