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Will We See Mercury 350 V8's This Year?

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Will We See Mercury 350 V8's This Year?

Old 01-04-2021, 06:48 PM
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Default Will We See Mercury 350 V8's This Year?

Thinking about delaying my purchase betting Mercury will roll out a 350 V8 this year.

$10,000 bump?

What are the odds given a 450R already exists?

Last edited by tboylan; 01-04-2021 at 07:00 PM.
Old 01-04-2021, 07:02 PM
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Originally Posted by tboylan View Post
Thinking about delaying my purchase betting Mercury will roll out a 350 V8 this year.

$10,000 bump?

What are the odds given a 400R already exists?
They already make a 360hp version. Itís for Formula 1 race boats and revs to 7000 rpm.


A 350hp version on this platform is..... highly unlikely. Would you even want an engine that has to rev to 6900 rpm to make 350 hp? Reliability and fuel economy would likely suffer.

https://www.mercuryracing.com/outboards/engines/360apx/




Old 01-04-2021, 08:00 PM
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That 360APX is rated 360hp at the prop. So probably closer to 400hp.

350 would not be hard to achieve on the current 300V8 Iím pretty sure we will see it. The 300R is probably pretty close and it revs 6400.
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Old 01-04-2021, 08:06 PM
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Why wouldn't Merc have released the 300 as a 350 off the bat to kneecap Yamaha even further? I would doubt It i think that the headroom is in the boosted version. Much like they did in the past with the 275 Verado being boosted up to 400 now.
Old 01-04-2021, 08:14 PM
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Originally Posted by ucf_motorcycle View Post
That 360APX is rated 360hp at the prop. So probably closer to 400hp.

350 would not be hard to achieve on the current 300V8 Iím pretty sure we will see it. The 300R is probably pretty close and it revs 6400.
Where are other motors rated at? it's a little known THT fact, that all Mercury motors are way over their rated HP.
Old 01-04-2021, 08:19 PM
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Originally Posted by noelm View Post
Where are other motors rated at? it's a little known THT fact, that all Mercury motors are way over their rated HP.
I don't see that. There is little incentive for the mfg to do that when they can take advantage of that headroom and release a "brand new" version with a higher hp and capture more buyers and create another press event.
Old 01-04-2021, 08:21 PM
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Suzuki makes 350hp out of a 4.4L V6 at 6300 RPMs, certainly Mercury can get 350hp out of a 4.6L V8 and not have to rev it to 7000 rpms, if they chose too. Maybe they chose to have a high RPM on there 360APX race motor???
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Old 01-04-2021, 08:33 PM
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Originally Posted by noelm View Post
Where are other motors rated at? it's a little known THT fact, that all Mercury motors are way over their rated HP.
Just about everything is rated crank HP. I noticed the 360HP at prop when I read the specs on that engine when they first released it.
Old 01-04-2021, 08:36 PM
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Originally Posted by ucf_motorcycle View Post
That 360APX is rated 360hp at the prop. So probably closer to 400hp.

350 would not be hard to achieve on the current 300V8 Iím pretty sure we will see it. The 300R is probably pretty close and it revs 6400.
All outboard hp numbers are measured at the prop. Well at least outboards made after the mid 1980s.
Old 01-04-2021, 08:44 PM
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Originally Posted by MUHSFINK07 View Post
Why wouldn't Merc have released the 300 as a 350 off the bat to kneecap Yamaha even further? I would doubt It i think that the headroom is in the boosted version. Much like they did in the past with the 275 Verado being boosted up to 400 now.
Because they already have a 350 that still sells well.

Why compete with yourself?

Adding more boost (or just increasing and decreasing a tune) is waaaaaay easier than trying to get 350 hp out of a 4.6 NA v8.

Show me a single automotive 4.6 L engine making 350 hp at 6000 or less rpm. It doesnít exist without increasing rpm. And that requires much more than a tune to get to 350.
Old 01-04-2021, 08:48 PM
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I would agree with that however from what I recall the thought was that they would no eat into a 350 Verado that they had already paid for and had excess parts built up to continue production until the parts ran out. I realize that this argues against what I said earlier however I would think that there would be little incentive to tease consumers with a different product i.e. the 350 Verado aside from coming out with a dual option, the 300 V8 as well as the 350V8. I guess that is why I am not an executive at Mercury! Lol.
Old 01-04-2021, 09:00 PM
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Originally Posted by 69Mach390 View Post
Because they already have a 350 that still sells well.

Why compete with yourself?

Adding more boost (or just increasing and decreasing a tune) is waaaaaay easier than trying to get 350 hp out of a 4.6 NA v8.

Show me a single automotive 4.6 L engine making 350 hp at 6000 or less rpm. It doesnít exist without increasing rpm. And that requires much more than a tune to get to 350.
To be fair, didnít the 300 Verado V6 sell really well too? So why change that platform to the new V8 and not the 350?
Old 01-04-2021, 09:31 PM
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Originally Posted by PremierPOWER View Post
To be fair, didnít the 300 Verado V6 sell really well too? So why change that platform to the new V8 and not the 350?
Probably because engines have a limited shelf life before they come up with something newer and better.

Either due to market demands, competition, or just innovation. You can only sell the same old product for so long before either you have to or the competition will come out with something better.

The 200-300 market is likely their best sellers so going NA likely opens up more buyers from those people who donít like super chargers.

But getting more reliable NA horsepower (like the 425 from Yamaha) takes some serious engineering and adds some serious weight and $$.
Old 01-04-2021, 10:24 PM
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Originally Posted by ucf_motorcycle View Post
just about everything is rated crank hp. I noticed the 360hp at prop when i read the specs on that engine when they first released it.
wrong........
Old 01-04-2021, 10:56 PM
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Originally Posted by 69Mach390 View Post
Because they already have a 350 that still sells well.

Why compete with yourself?

Adding more boost (or just increasing and decreasing a tune) is waaaaaay easier than trying to get 350 hp out of a 4.6 NA v8.

Show me a single automotive 4.6 L engine making 350 hp at 6000 or less rpm. It doesnít exist without increasing rpm. And that requires much more than a tune to get to 350.
I assume you mean NA automotive engines. Didn't Ford get close with those old Cobras or the early 2000's Mach 1?

Edit- looks like a variant of the Northstar engine (LH2) gets close too?

Last edited by novabasstoon; 01-04-2021 at 11:11 PM.
Old 01-05-2021, 04:10 AM
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Originally Posted by 69Mach390 View Post
Because they already have a 350 that still sells well.

Why compete with yourself?

Adding more boost (or just increasing and decreasing a tune) is waaaaaay easier than trying to get 350 hp out of a 4.6 NA v8.

Show me a single automotive 4.6 L engine making 350 hp at 6000 or less rpm. It doesnít exist without increasing rpm. And that requires much more than a tune to get to 350.
My 2012 Ford F-150 5.0L makes 360hp @ 5500RPM. The 2021s make 400hp @ 6000RPM. The Mustang 5.0L makes 80 more HP.

With the Miami show being cancelled, I donít see a new engine being released without the big stage the show usually provides. With the constraints already put on them by the China flu, Iíd expect them to wait until 2022. Demand for them would be through the roof, but the supply would never be able to keep up. I donít think they want to go through the delays again that they went through when the V6s and V8s were released in 2018.

Thatís my opinion on the matter. They could surprise everyone and release them at a Mercury-only event similar to what they did with the 450 release party.
Old 01-05-2021, 04:42 AM
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Here's why I raised the question. Check out the Whaler Conquest 325 performance comparisons between the 300 V8, L6 350 and L6 400.

Note: The 350 and 400 test boats had Seekeepers on them (414 lbs) but cannot imagine they'd have any kind of material impact on the numbers.

Why would anyone want to pay more for the L6 350 after seeing this?

Give me some V8 350's so I can get to 50 mph on 87 octane!

Twin Mercury 300 V8 AMS:
  • TESTING INFORMATION
  • Model: 325 Conquest
  • Hull #: USBWCE0408F920
  • Engine: Twin Mercury 300 V8 AMS
  • Horsepower: 600
  • Gear Ratio: 1.85 : 1
  • Prop: 16" x 18" Enertia Eco
  • Fuel Capacity: 300 gallons
  • Notable Options: Anchor Windlass Chain, 4kW Open Array Radar, Sunshade, Cruising Package, Heater System, Starboard Interior Storage Cabinet, Cockpit Table, Port Cockpit Folding Seat, Cockpit Refrigerator
  • Test Date: 20-Nov-2019

Name:  325-conquest-twin-300-data-table-2.jpg
Views: 2320
Size:  69.3 KB

Twin Mercury 350 Verado (with gyro):
  • TESTING INFORMATION
  • Model: 325 Conquest
  • Hull #: USBWCE0011H920
  • Engine: Twin Mercury 350 Verado (with gyro)
  • Horsepower: 700
  • Gear Ratio: 1.75 : 1
  • Prop: 16" x 17" Enertia Eco
  • Fuel Capacity: 300 gallons
  • Notable Options: Generator, Joystick piloting, Cruising package, Radar, Electronics, Cockpit A/C, Sunshade, Cockpit bench seat, Gyro
  • Test Date: 08-July-2019

Name:  325-conquest-twin-350-data-table.jpg
Views: 2349
Size:  39.6 KB


Twin Mercury 400 Verado (with gyro):
  • TESTING INFORMATION
  • Model: 325 Conquest
  • Hull #: USBWCE0011H920
  • Engine: Twin Mercury 400 Verado (with gyro)
  • Horsepower: 800
  • Gear Ratio: 1.75 : 1
  • Prop: 16" x 17" Enertia Eco
  • Fuel Capacity: 300 gallons
  • Notable Options: Generator, Joystick piloting, Cruising package, Radar, Electronics, Cockpit A/C, Sunshade, Cockpit bench seat, Gyro
  • Test Date: 15-July-2019

Name:  325-conquest-twin-400-data-table-e1572981021683.jpg
Views: 2322
Size:  42.3 KB

Last edited by tboylan; 01-05-2021 at 04:49 AM.
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Old 01-05-2021, 04:49 AM
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Originally Posted by 69Mach390 View Post
Would you even want an engine that has to rev to 6900 rpm to make 350 hp? Reliability and fuel economy would likely suffer.
But imagine the sound!
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Old 01-05-2021, 04:54 AM
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Originally Posted by 69Mach390 View Post
Because they already have a 350 that still sells well.

Why compete with yourself?
To make sure you stay ahead of the competition. If the reason for not replacing a perfectly good engine is a valid one, why did Mercury introduce the current 150 - 300hp line up?

Apart from those that push the hp boundaries, all outboards introduced from all manufacturers are replacing an existing model.
Old 01-05-2021, 06:11 AM
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I am building a 27 center console and have the choice between the 300v8 and the 350L6 and I am going with the v8 , with fuel on water in my area being 87,89, 90 octane I will never get full performance from the 350's. I will give up maybe 2-3mph on the top but increase cruise mpg by .5.

I would love a 350 v8 that ran on 89 and asked the builder if he had heard any rumors about it happening and he said they had heard nothing.

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