to those who are thinking of new 2 stroke outboards

BFC

Senior Member
How does this fit in the Mix ??
 

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have any of you looked at engine specs?

I recently noticed that the two strokes compression ratio were about 6:1

a 4 stroke runs on 10:1 "normally"

so I essence, you are running a 2 stroke on less internal force.

so it lasts longer.................

ek te lui om nou alles te tik, sien hier kom n ding oor so n stelling
 

Fanie

Sealiner
Hier is beslis die geleentheid waar jy nie 'n 2-slag enjin wil he nie !
https://www.youtube.com/watch?v=LvHOo1q-TDQ
 

Seadoc

New member
willem wikkel spies wrote:
have any of you looked at engine specs?

I recently noticed that the two strokes compression ratio were about 6:1

a 4 stroke runs on 10:1 "normally"

so I essence, you are running a 2 stroke on less internal force.

so it lasts longer.................

ek te lui om nou alles te tik, sien hier kom n ding oor so n stelling

What is the compression ratio in a diesel? So you are saying a 2 stroke will outlast a diesel ?


It is generally accepted that 2 strokes will last about 2000 hours and 4-strokes about 5000 hours with commercial use.

No manufacturers that I am aware of are developing new coventional 2 strokes. The models still for sale are all ancient designs and will die a natural death- sorry!@
 

Gone.fishing4

New member
:::S

I have posted this before on this link on Sealine asking for your guys opinions before I upgraded from 2x90hp Mercury’s to the 4S lean burn 115HP SUZUKI, and Man I am not one Bit sorry, all round could not of got any better. on the link.
http://www.sealine.co.za/view_topic.php?id=84092&forum_id=19

WELL here is somthing i also found on this matter, between 2 or 4 stroke motors.

When the time comes to repower Old Faithful or to spring for a new boat, what kind of outboard are you going to buy? Tough question, given the dozens of innovative choices from the various engine manufacturers.
One of the biggest decisions is whether to invest in a two-stroke or four-stroke engine. With the proliferation of misinformation regarding this subject, it’s easy to confuse fact and fiction. Not to worry. We’ll walk you through the fundamentals and add some clarity to the subject.
TWO-STROKES
In a two-stroke engine, the fuel-air mixture enters the combustion chamber via a opening in the side of the cylinder. The exhaust exits through another port in the cylinder.
Initially, two-stroke engines used carburetors to control the fuel-air mixture. But carbureted outboards aren’t particularly efficient. They also use a lot of fuel, and tend to be cantankerous creatures.
Today’s top-of-the-line two-stroke engines use a computerized Direct Fuel Injection (DFI) system to precisely regulate the fuel-air mix to suit the operating conditions. That results in amazing performance gains as well as great fuel economy and low emissions.
Typically, a two-stroke outboard is lighter than a similar-sized four-stroke engine because the two-stroke’s method of operation doesn’t require a valve train — camshafts, valves, belts or chains. Since the two-stroke isn’t encumbered with a valve train, the engine has fewer moving parts. Thus, it has less rotating mass. A two-stroke outboard can often accelerate faster than the same horsepower four-stroke.
The engine’s internal components receive lubrication from oil mixed into the fuel.
Contrary to popular belief, two-strokes aren’t a dying breed. The fact is, carbureted two-strokes are going away due to their inability to comply with increasingly stringent emissions legislation. However, the DFI two-stroke outboards are thriving and remain popular.
FOUR-STROKES
Four-stroke outboards use an engine very similar to an automobile’s. The air-fuel mixture flows into the combustion chamber through intake valves, and the exhaust leaves the engine via exhaust valves.
Because of these intake and exhaust valves (the valve train), a four-stroke outboard is usually heavier than a two-stroke outboard of the same horsepower. But, we see that changing: four-stroke manufacturers continue to pursue new ways to lighten the engines and extract more horsepower.
A four-stroke outboard’s lubrication system is like a car’s, complete with oil pan and filter — and the engine needs periodic oil changes to keep things running smooth.
The majority of four-stroke outboards feature sophisticated computer engine management systems and fuel injection for good performance across the power band, low emissions, and unparalleled fuel economy.
CHOOSE YOUR OUTBOARD
From an angler’s perspective, a boat is nothing but a means to get to where the fish are — a fishing platform — and the outboard is the driving force behind the boat. Tools of the trade, so to speak.
Taking that point of view, how do you pick the right outboard for your boat? Two-stroke or four-stroke — the broad answer is, it depends.
It depends on how you fish, where you fish, what kind of boat, and how much gear you carry with you.
If you’re a dedicated tournament angler, then you need an outboard that will pop the boat up on plane quickly and maximum top-end speed to get to the honey-holes before your competition does. In this case, a two-stroke might fill the bill nicely.
Fishing situations that require long periods of idling through no-wake zones, or pursuing bass in large impoundments where you’ll need to go several miles to find the fish, calls for an engine that’s quiet and stingy on fuel. A four-stroke could do well here.
The kind of boat also dictates the best engine. For example, every boat has a placard stating the boat’s weight capacity; a smaller boat may not be able to tolerate the additional weight of a four-stroke outboard. On the other hand, if your rig is one of the newer mega-boats — 21 feet plus, or if you fish alone and don’t take a bunch of extra stuff with you — then you can start looking at four-strokes.
A big boat or heavily loaded boat can benefit from the torque of a four-stroke outboard.
On the economic and practicality front, it’s important to consider who is going to service the engine and be there for you to take care of any potential warranty issues. The type of engine that your local dealer carries is a major consideration in choosing your new outboard.
Your local dealer will often work with you and perhaps make you a better deal at trade-in time, in addition to being available when trouble rears its ugly head.
BOTTOM LINE
Fuel economy and speed are comparable between two-strokes and four-strokes. Two-strokes tend to weigh less but can accelerate faster. Four-strokes tend to be quieter and have more torque than two-stroke outboards.
Both technologies are solid and highly evolved. Each has advantages an disadvantages.
Now you have a better idea which is the best for the transom of your fishing boat.


Read more: http://www.gameandfishmag.com/2011/07/25/how-to-decide-between-a-two-or-four-stroke-outboard-boat-engine/#ixzz2US9Blql3

So at the end of the day its YOUR choise.
 

Seadoc

New member
I agree in broad terms what was written above although the author does make a few debatable statements. The two strokes they are referring to are the modern high pressure fuel injected 2 strokes though like the Etecs, Optimaxes and HPDI's.

I was saying conventional 2 strokes are dying a slow death and will probably eventually only be built under license (or just copied) by Chinese manufacturers. I agree that there could be an argument for them in small horsepower applications while legislation in the bigger markets still allow them to be sold new.

When last did one of the major manufacturers release a newly designed conventional 2 stroke?
 
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