Four stroke vs two stroke outboard

They are generally easier to repair and maintain having a comparatively simple design that has been available for almost 80 years. Two-Stroke Outboards Versus Four-Stroke Outboards - YouTube.

A common belief is that a fourstroke outboard has more power than the two-stroke variety.

Four stroke vs two stroke outboard. In comparison to 4 strokes 2 stroke motors were lighter had quicker acceleration and were smaller and more portable. For these reasons 2 strokes dominated the market for many years. Despite this a common concern with 2 stroke motors was the fact that they would use more fuel to operate.

A common belief is that a fourstroke outboard has more power than the two-stroke variety. Hence a four-stroke outboard should be the preferred choice. To begin with this is a misconception as the reverse is true.

Secondly several factors decide which of the two types of outboards will be suitable. A 2-stroke engine doesnt use valves to regulate the fuelair intake or exhaust gas exit so it has fewer moving parts and is smaller and lighter. The 4-stroke engine is mechanically more complex relying on four piston strokes to complete its power cycle which gives it lots of torque.

Boat fuel isnt cheap and outboards can be thirsty beasts. The cost of fueling an outboard throughout boating season can amount to thousands of dollars. Four-stroke outboards generally have better fuel economy than 2-strokes.

Additionally two-stroke engines are less fuel-efficient get fewer miles per gallon and produce more emissions than four-stroke outboard motors. A four-stroke engine works by running one compression stroke followed by an exhaust stroke. Each stroke is followed quickly by a return stroke.

Most four-stroke outboard motors on the market today. It really comes down to how the cylinders are lubricated. 4-stroke outboards have internal oil reservoirs and sumps which need regular oil level checks filter replacements and oil changes at least annually.

2-stroke outboards generally have an external oil tank with the oil and fuel mixture injected into the cylinder. Why is 4 stroke better than 2 stroke. Therefore people would choose 4 strokes because of their fuel efficiency and lower emissions.

4 strokes also tended to run smoother and quieter in comparison to 2 strokes. In the last 15 to 20 years however both 2 and 4 strokes motors have made significant improvements. How fast can a 15 hp outboard go.

4 stoke outboards are heavier than an equivelent 2 stroke with the same power often due to their larger relative size. 4 strokes are more mechanically complex around power block and head so consequently to a higher level of skill to maintain and repair. The 4-stroke engine is also much quieter a 2-stoke engine is significantly louder and has a distinctive high-pitched buzzing sound.

Because 2-stroke engines are designed to run at a higher RPM they also tend to wear out faster. A 4-stroke engine is generally more durable. A third set of tests compared a 135-hp two-cycle DFI outboard against a 130-hp four-cycle outboard on identical 20 boats.

The two-cycle delivered 425 mpg at 208 mph against a best 397 mpg at 204 mph for the four-cycle. Best economy for the two-cycle was achieved at 279 mph. On average 2 stroke outboard motors are lighter than 4 stroke outboard motors.

2 stroke outboard motors have fewer parts and moving pieces than 4 stroke motors. For this reason they tend to be lightweight. Today there are numerous changes and improvements taking place in outboard motor manufacturing and design.

Between about 3000-4000 RPM it looks like the four-stroke consumes a bit less than the two-stroke but at higher revs above 4000 RPM the two-stroke is using less than the four-stroke. In normal use a range of engine speeds would be used so my guess is that the differences between the mid- and high-range consumption figures would cancel out. Cheaper to maintain.

On average maintenance costs for an Evinrude outboard engine are up to 50 less than maintenance costs for a four-stroke outboard over the first three years of ownership. My E-Tec saves me thousands. An Evinrude E-TEC is up to 50 quieter than the old 2-strokes.

Evinrude 2 stroke Mercury Optimax 2 stroke Mercury 4 stroke Yamaha 4 stroke. For example two-stroke motors are lighter faster in most cases and less expensive. Four-stroke motors are cleaner smoother and more economical.

Many people who run in lakes and rivers prefer 4 stroke boat motors because they make great trolling motors and meet the 2006 EPA mandated requirements. 4-Stroke Outboard Performance Final Word. Based solely on the mechanical design and workings the 2-stroke has the edge when it comes to acceleration and top speed while the 4-stroke is better on reliability and durability.

Both engine types have their pros and cons. However modern engineering and technology have closed. Two-Stroke Outboards Versus Four-Stroke Outboards - YouTube.

Two-Stroke Outboards Versus Four-Stroke Outboards. Advantages of four-stroke outboard engines. From a cost perspective four-stroke outboards are much more fuel efficient than two-strokes.

A four-stroke motor can be up to 50 more fuel efficient than a two-stroke motor with the same horsepower. For environmental concerns four-stroke outboards produce far fewer harmful emissions. The classic Sport 13 can handle a 200lb outboard but I dont recommend it.

That is a very light hull and giving it that much stern weight would make it handle badly. I tried several engines on my Sport 13 and found the improved handling with the lighter engines easily made up for the lack of mach 1 speed. Two Stroke verses Four Stroke Outboards - the Reliability and Servicing Issues As noted above the key difference between two strokes and four strokes is that the modern four stroke engines are now all far far more reliable.

When the new generation of engines were introduced and had bedded in reliability massively improved. Contrary to popular belief about 2 strokes new Evinrude E-Tecs are cleaner and quieter than four-stroke outboard motors just as fuel efficient and more imp. When choosing between a two-stroke or four-stroke outboard motor for your boat the features of each must be considered.

Two-stroke outboard motors are lighter in weight less expensive and often faster. They are generally easier to repair and maintain having a comparatively simple design that has been available for almost 80 years.