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9/22/2017 12:11:25 AM
Posted: 10/21/2011 6:16:34 PM EDT
What is the largest cylinder engine and HP of a merc outboard? anyone know?

And this can include prototypes.

This is a serious question guys as I heard about something but cant reveal any details at this time.
Link Posted: 10/22/2011 6:20:54 AM EDT
[Last Edit: 10/22/2011 6:25:42 AM EDT by KB7DX]
The largest horsepower Merc I have seen was a joint effort between Merc and Marine Turbine. That outboard was reported to have 450+ HP. The largest conventional reciprocating engine is the 3.0l V6 at this time. This displacement is available in the Optimax series. I think they may have made a 3.4l engine, but my memory is foggy.
ETA- You must be in Fon Du Lac..??
Link Posted: 10/22/2011 6:45:36 AM EDT
Oshkosh actually, have looked on their website. The verado series is nice but no hints as to anything really big like 6+ in an inline motor.
Link Posted: 10/22/2011 4:56:32 PM EDT
[Last Edit: 10/22/2011 4:58:46 PM EDT by KB7DX]
The Verado's are nice engines. I-6 supercharged. I installed a few on Triton center console boats this spring. They run smooth and very quiet. They are also pretty heavy. The Verado wouldn't be my choice for a bass boat. I'll take an old 2 stroke carbureted Black Max for a bass boat, maybe an EFI (not DFI).
ETA–– OMC used to make a V-8 2-stroke outboard. I worked on one of those a couple years ago. Man did that thing sound wicked. The boat's name was "The Hellion" and it sure was.
Link Posted: 10/24/2011 10:24:32 AM EDT
This is now the largest outboard....You can thank me later :)

7 marine
Link Posted: 10/24/2011 11:22:10 AM EDT
I was thinking of something closer to an inline 12 cyl monster?
Link Posted: 10/24/2011 2:14:32 PM EDT
WOW! That 7 Marine V-8 is impressive. Definately suited for offshore boats. I still want a turbine though. The turbine powering the Mercury experimental outboard only weighs 140 pounds. There used to be a video of the turbine on a bass boat somewhere. Sounds wicked! I wish 7-Marine would have cut the music and let the engine sound come through for a bit. Other than the turbine, nothing sounds like a V-6 2 stroker at 6200 RPM's.

Me ^^^^

Link Posted: 10/26/2011 5:10:21 AM EDT
[Last Edit: 10/26/2011 5:11:03 AM EDT by eclark53520]
KB...you look like Ron White in that picture...


EDIT: What kind of lower units are on those? They don't look stock...but then, i've never seen a 300hp out board either...
Link Posted: 10/26/2011 10:00:53 AM EDT
Those are Mercury "Sportmaster" gearcases. They come stock on the 300X outboards. By the way...who is Ron White?
Link Posted: 10/27/2011 5:33:16 AM EDT
Originally Posted By KB7DX:
By the way...who is Ron White?

Not sure if serious...
Link Posted: 12/1/2011 7:00:08 PM EDT
Largest production merc right now is the 350 verado! I believe it only comes in 25 and 30 inch lower unit for offshore rigs. Yamaha also has a 350 4-stroke
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