largest outboard engines ?

[sam111]

I am curious about how large an outboard engine can get in terms of weight and horse power hps.

I have a book that covers the general procedures of 2/4stroke engines from 2 to 300hps.
I am just wondering interms of outboard engines in the world which ones would be out side this range and what the current complete range is now a day's for outboard engines.

My other question is currently now a days are they still producing 2 stroke engines for outboard motors.
I know they are doing less so since the emission on 2 stroke is not as efficient at the time being.
But just wondering if they still produces these for smaller outboard engines or if the trend is slowly moving completely way from 2 stroke engines for all small engines as well like chain saws , lawn mowers , tillers , snowblowers ,...etc

 

[sam111]

Re: largest outboard engines ?

Basically for question 2 will it be all 4 stroke engines in the future for all the engines car , boats , small engines , tractors ,trucks ,...etc?

 

[Bob_VT]

Re: largest outboard engines ?

E tec and optimax yes....... still 2 strokes but fuel injected.

They will probably vanish some day

 

[matt167]

Re: largest outboard engines ?

Tohatsu TLDI's are also in the mix up to 115hp. I actually think they offer the smallest 2 strokes nowadays. However, Tohatsu is teaming up with Honda and Honda will be badging some of their 4 stroke outboards as Tohatsu in the coming year, to make a 4 stroke option for 30+hp in the Tohatsu lineup.

 

[metriccrescentwrench]

Re: largest outboard engines ?

Largest.... 557 HP, supercharged 6.2 liter V8.

Seven Marine 557 Outboard: In-Water Debut | boats.com Blog

 

[roscoe]

Re: largest outboard engines ?

They are still producing plenty of carbed 2 cycle outboards, and other devices.
They just are not selling them in the USA.

Where ever you are located, they may be available.



""I am just wondering interms of outboard engines in the
world which ones would be out side this range and what the current
complete range is now a day's for outboard engines.""

Largest outboard I know about, is the 7 Marine 6.2L super-charged v-8. 557 hp

 

[sam111]

Re: largest outboard engines ?

Largest.... 557 HP, supercharged 6.2 liter V8.

ok is there anything in the range of 300hps to 557hps other then the beast 557 hp you posted?

Or is the general range still 2 to 300hps with a few exceptions

 

[dingbat]

Re: largest outboard engines ?

Largest.... 557 HP, supercharged 6.2 liter V8.

ok is there anything in the range of 300hps to 557hps other then the beast 557 hp you posted?

Or is the general range still 2 to 300hps with a few exceptions

Yamaha builds a 350HP as does Merc in the Verado series.

I see lots of 350 Yamahas. I have not seen a "Beast " or a 350 Verado on the water

 

[seahorse5]

Re: largest outboard engines ?

My other question is currently now a days are they still producing 2 stroke engines for outboard motors.
I know they are doing less so since the emission on 2 stroke is not as efficient at the time being.

I see that you are new here, welcome. Please do not fall into the habit of preconceived notions about 2-strokes. Most of what you hear about and read are years out of date compared to the products available today.

The Evinrude E-TEC is a computer controlled low-emission 2-stroke outboard that has fewer total emissions than most 4-strokes. It is also the only outboard that the EPA bestowed its Clean Air Award to. It is the only outboard to be allowed on some of the most regulated and pristine waters around the world such as Lake Constance (Bodensee) in Europe.

When most people say 2-stroke, they only think of the old carbureted smoky and noisy outboards from many years ago. The high-tech 2-strokes today are a whole different animal with none of the drawbacks that the old fuel injected and carbureted ones had.

 

[Chris1956]

Re: largest outboard engines ?

To add to what Seahorse said, Evinrude e-TEC and Mercury Optimax are two-cycle direct injected outboard motors. Both meet CARB polution standards, and are legal for use in most/all bodies of water. Being that they are 2 cycle motors, they still burn some oil. However, burnt oil is not considered to be poluting, for some reason. The important polutants of 2 cycle motors is unburned hydrocarbons. These are greatly reduced by the Direct Injection fuel injection.

 

[Sea Rider]

Re: largest outboard engines ?

Standard 2 strokes engines are still manufactured and sold to countries that have not banned them, probably 50% of the world still uses them. Can't speak for all mayor brands, Tohatsu currently sells all of it's models in the portable to top range series.-

Happy Boating

 

[sam111]

Re: largest outboard engines ?

I see that you are new here, welcome. Please do not fall into the habit of preconceived notions about 2-strokes. Most of what you hear about and read are years out of date compared to the products available today.

The Evinrude E-TEC is a computer controlled low-emission 2-stroke outboard that has fewer total emissions than most 4-strokes. It is also the only outboard that the EPA bestowed its Clean Air Award to. It is the only outboard to be allowed on some of the most regulated and pristine waters around the world such as Lake Constance (Bodensee) in Europe.

When most people say 2-stroke, they only think of the old carbureted smoky and noisy outboards from many years ago. The high-tech 2-strokes today are a whole different animal with none of the drawbacks that the old fuel injected and carbureted ones had.

Yes I understand 2 stroke can be made as good as 4 stroke but I was under the impression that the emissions for 2 stroke are still a lot poorer then 4 stroke but maybe the fuel injection instead of carburetor solve that problem. I can't see to much differents still same chemicals in large or smaller ratio's going thru the same process from what I am thinking. Though maybe missing a step.

Also curious what is the draw backs or benefits over using a new 2 cycle based engine over the 4 cycle engines?
The must be pro's or con's even with the new based ones

 

[Chris1956]

Re: largest outboard engines ?

Sam, 2 cycle direct injection motors are a lot different than carb or EFI 2 cycle motors. In the DI models, oil and air enter the crancase via a throttle body and oil injection ports. Gasoline is injected into the cylinder after all ports are closed. So, all the gasoline is consumed, and the exhaust scavanging is done by fresh air, not air/fuel. The eliminates most/all of the unburned fuel from exiting the exhaust, and improves fuel eficiency greatly. Obviously DI 2 cycle motors are much more complicated than carb versions, and there is debate about whether 2 cycle DI motors are better than 4 cycle motors.

 

[seahorse5]

Re: largest outboard engines ?

Yes I understand 2 stroke can be made as good as 4 stroke but I was under the impression that the emissions for 2 stroke are still a lot poorer then 4 stroke but maybe the fuel injection instead of carburetor solve that problem.

Sam,

It looks like you have a lot of learning to do about E-TECs and Opti's.

One thing to remember is that a 4 stroke becomes "dirtier" as the engine is used. Normal wear on the cylinder, pistons, and rings allow more oil into the combustion chamber which increases hydrocarbon output and particulate matter as 4-stroke oil contains metallic elements and is not designed to be burned.


Here is the link to the EPA Clean Air award to E-TEC 2004 Award Recipients | Clean Air Excellence Awards | US EPA

 

[kfa4303]

Re: largest outboard engines ?

Not to mention the fact that far fewer parts go into 2-strokes than 4-strokes, which means they fewer parts have to be designed, produced, packaged, shipped, etc.....Even keeping vintage 2-strokes alive, like so many of us do here in the forums, is good for the environment. While they make make a puff of smoke at start up, that's nothing compared the the materials, waste, and pollution used to build even the most efficient modern motors. Don't forget, all those fancy computerized components use rare earth elements that have to be mined somewhere, and that shiny new paint is just another petrochemical in disguise, etc... While 4-strokes certainly have their place, they aren't intrinsically "better" than 2-strokes. Just different.

 

[dingbat]

Re: largest outboard engines ?

Also curious what is the draw backs or benefits over using a new 2 cycle based engine over the 4 cycle engines?
The must be pro's or con's even with the new based ones

The main draw back of the 2 stroke is pouring $35-40 a gallon oil in the tank and watching it go out the exhaust. Even at 100:1, that's the equivalent of paying an additional 35-40 cents a gallon for fuel.

 

[Scott Danforth]

Re: largest outboard engines ?

Eric and Rick Davis at 7 Marine may not be stopping at the 557 LSA motor. the 727hp LS9 fits in the same cowling :happy:

 

[sam111]

Re: largest outboard engines ?

So then what is currently the biggest 727hp or bigger for outboards. As well many different make/models are in the 300 hps + range ?
Most sites have like portables , midsized , large with large getting up to 300hp max normally,midsizes starting around 50 to 90hps , portable anything under 50hp normally.

Also curious on how heavy this are to pickup I know portables you can normally carry by your self , but what about when you get into midsizes , or large do you need special tools to pick these up or move these around? I guess how generally are the outboard engines transported in large sizes boats.

 

[dingbat]

Re: largest outboard engines ?

Also curious on how heavy this are to pickup I know portables you can normally carry by your self , but what about when you get into midsizes , or large do you need special tools to pick these up or move these around? I guess how generally are the outboard engines transported in large sizes boats.

Don't know many people that consider something that weighs #500 to #800 as being portable.

 

[Chris1956]

Re: largest outboard engines ?

KFA, I am not sure that DFI 2 cycle motors have less moving parts than an equivalent 4 cycle motor. The DI motors have belt driven compressors and pumps (Opti) and fancy fuel pumps (e-TEC). The rest of your post may not be exactly accurate as well.

Ding and Seahorse. BRP claims that buring the 2 cycle oil in an e-TEC is an advantage. They reason is that they claim 1/2 of all used 4 cycle motor oil is improperly disposed. So burning it up is more environmentally correct.

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