22
May
Think about the size of your boat and how you intend to use it. 2-stroke outboards generally have an external oil tank with the oil and fuel mixture injected into the cylinder.
The 4-stroke engine is mechanically more complex relying on four piston strokes to complete its power cycle which gives it lots of torque.
Two stroke vs four stroke outboards. 2 Stroke vs. 4 Stroke Outboard Fuel Economy. In the past 2 stroke motors burned more fuel than 4 strokes.
However the 2 cycle product is now much more efficient in its injection methods used to bring fuel into the engine. Some companies claim to be more fuel efficient than others but in many cases its a matter of splitting hairs. Advantages of Two-stroke Outboards.
Two-stroke outboards fire for each revolution of the engine instead of every other revolution as in four-stroke engines. This makes two-stroke outboards more powerful than the four-stroke variety. A two-stroke engine works in different orientations.
This factor makes it a more robust engine than the four. 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.
Four-stroke outboards generally have better fuel economy than 2-strokes. But again modern technologies have closed the gap significantly. However 2-stroke motors will always be less fuel efficient by design.
A typical 4-stroke motor needs one or two oil changes per boating season. 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.
Typically a 2-stroke engine creates more torque at a higher RPM while a 4-stroke engine creates a higher torque at a lower RPM. The 4-stroke engine is also much quieter a 2-stoke engine is significantly louder and has a distinctive high-pitched buzzing sound. 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.
What is a Two-Stroke Engine. A two-stroke engine is an engine that completes a power cycle with two strokes of the piston during only one crankshaft revolution. What is a Four-Stroke Engine.
A four-stroke engine is an internal combustion engine in which the piston completes four separate strokes while turning the crankshaft. In a 2-stroke engine all the four stages intake compression power and exhaust of a power cycle completes in just two strokes of the piston while in a 4-stroke engine all the four stages intake compression power and exhaust of a power cycle complete in four strokes of the piston. At present four strokes remain up to 50 quieter than most two stroke engines and they are more efficient than two stroke engines.
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.
A 4-stroke engine has a completely sealed cylinder the valves only open at the top into the combustion chamber. So the oil that lubricates the engine is kept away from the combustion chamber. A 2-stroke engine cannot do this.
When the piston passes the intake port the combustion chamber is open to the cylinder. The traditional go-to engine for boats were two-stroke engines. Their zippy throttle response and lightweight makes them perfect for use on the water.
However four-stroke engines have gained a following thanks to their more refined performance and cleaner operation. Think about the size of your boat and how you intend to use it. Earlier in the Engines section we saw how 4 stroke 2 stroke engines work.
We might like to give a thought on which is better one OR which has more advantages. So in this article we are going to discuss about the differences advantages disadvantages of 4 stroke 2 stroke engine. Well most banned 2-stroke areas are just banning the premix motors so an oil-injected 2-stroke will likely be OK.
Otherwise as was noted the weight difference of a 4-stroke may be offset by going down one motor family size. Say for instance getting a 30hp FI TohatsuNissanMerc. There are 2 kind of engines for jet skis.
The 2 stroke is kind of smokey. The 4 stroke costs more but has less smoke. Whether or not you have bought a jet ski before it is common knowledge that engines are one of the most vital parts when it comes to them.
2 Stroke Vs 4 Stroke Outboard Which is better. Two-stroke motors require a mixture of oil and gas to lubricate all of the moving parts which can be expensive and somewhat difficult to formulate. 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. Two-Stroke Outboards Versus Four-Stroke Outboards - YouTube. Two-Stroke Outboards Versus Four-Stroke Outboards.
Others prefer 2 stroke engines when the need for top end performance and acceleration takes precedence. This is not to say that two-stroke engines cannot troll or four stroke motors are not fast. Its just a matter of preferences features and benefits that attract customers.
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. 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.