Opinions on the new Mercury 300 v8 outboard

Tater

Tater

New Member
Looking for any information or opinions on the Mercury v8 outboards. Haven’t found a ton of information on the motor as far as reviews, reliability or common problems with them. Researching this motor and the 300 Yamaha for a repower with mechanical controls.
 
More displacement means more torque, means bigger prop at lower speeds, which means potentially more usable rpm range and a lower minimum plaining speed. Can translate to better efficiency at lower speeds. I'm running a supercharged inline 6 350.. super curious how a v8 would stack up.. but noone publishes their torque curves. If you can.. find two performance tests with the same hull and both those motors. Will give you the most information to work with.
 
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If you're wondering about the standard V8 merc has been making since 2018, they are great. Certainly not new... I have had 3 sets of them starting 6 years back between a few hulls. I have a good local merc shop (rpm) so they are the only 300 class engine I buy. I've replaced a handful o2 sensors and cowling trim switches between the various motors (both simple warranty items that can wait until convenient to get fixed). Great fuel economy and torque from the v8s.
 
macro said:
More displacement means more torque, means bigger prop at lower speeds, which means potentially more usable rpm range and a lower minimum plaining speed. Can translate to better efficiency at lower speeds. I'm running a supercharged inline 6 350.. super curious how a v8 would stack up.. but noone publishes their torque curves. If you can.. find two performance tests with the same hull and both those motors. Will give you the most information to work with.
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Boston Whaler publishers this type of comparison data for their boats. Mercury engines only though. This is an example:

 
So no one’s really heard of any issues with the Mercury? What about opinions on the sea pro vs the fourstroke models?
 
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Mercury is one of the top brands around now, all new engines are good but in my history with mercury they stand behind their products and have the quality and reliability you want.
 
For me, its the ability to easily get parts since I do my own work. That and I havent had any major issues on mine.
 
So is there a reason to go with a seapro over the standard fourstroke model? Other than being de rated some in power and I think being able to change the lower unit oil while in the water are there any other differences?
 
Tater said:
So is there a reason to go with a seapro over the standard fourstroke model? Other than being de rated some in power and I think being able to change the lower unit oil while in the water are there any other differences?
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I do not see any reason to go seapro unless it is cheaper.
 
Tater said:
So is there a reason to go with a seapro over the standard fourstroke model? Other than being de rated some in power and I think being able to change the lower unit oil while in the water are there any other differences?
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That is not a feature on the Merc 300

SeaPro™ 200-350hp Outboard Motor

SeaPro™
www.mercurymarine.com www.mercurymarine.com

Easy to Maintain​

The industry-exclusive top-cowl access door eliminates hassle, allowing you to check or top off oil without removing the cowl. And gearcase oil can easily be drained from the torpedo.
 
I just wasn’t sure if there was some major differences I was missing between the two. Like if it had a stronger lower unit heavier transom bracket or something. I’ve tried researching these things and haven’t been able to find much. And I see I was mistaken on the lower unit oil change.
 
Tater said:
So is there a reason to go with a seapro over the standard fourstroke model? Other than being de rated some in power and I think being able to change the lower unit oil while in the water are there any other differences?
Click to expand...
The seapro is mostly targeting the commerical crowd. I believe you get a better warranty for the rec side if you buy a normal 4 stroke. I think it’s 5 years for the 4 stroke (maybe more when they are on promo).
 
Tater said:
I just wasn’t sure if there was some major differences I was missing between the two. Like if it had a stronger lower unit heavier transom bracket or something. I’ve tried researching these things and haven’t been able to find much. And I see I was mistaken on the lower unit oil change.
Click to expand...
Just call RPM and ask. Why not ask the guys that sell them by the dozens. They will know.
 
Pineapple Express said:
That is not a feature on the Merc 300

SeaPro™ 200-350hp Outboard Motor

SeaPro™
www.mercurymarine.com www.mercurymarine.com

Easy to Maintain​

The industry-exclusive top-cowl access door eliminates hassle, allowing you to check or top off oil without removing the cowl. And gearcase oil can easily be drained from the torpedo.
Click to expand...

You dont have to take the props off to drain the gear case on a seapro so it is definitely possible to perform in season gear case changes without haul out...just brace for a ton of judgement across the docks if you get the shakes, and have a life time supply of gear case screws for when they slip out of your hands forever more.
 
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