what is the difference between 2 stroke and 4 stroke outboards?
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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.
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A four-stroke engine separates the intake, compression, power and exhaust strokes with the use of poppet valves, but it only makes one power stroke every 720 degrees of rotation of the crankshaft. A two-stroke engine makes power every 360 degrees of rotation.
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As a general rule, fewer parts equals less potential for failure and easier maintenance. Overall, the 2-cycle engine is typically smaller in displacement and size as compared to 4-cycle which, many times, is almost double the displacement and overall size to achieve the same power.
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At cruising speed the outboard manages 5.0 mpg, 25 percent better than the sterndrive and 52 percent better than the jet. We don't have a good explanation for this beyond the fact that the sterndrive boat weighs 600 pounds more than the outboard, and the jet drive system is less efficient than the outboard's propeller.
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A 2-stroke engine relies on both the cylinder and crankcase to make this happen. ... For its part, a 4-stroke engine requires four strokes of the piston to complete a power cycle. The four strokes are intake, compression, power and exhaust.
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Is Evinrude E-TEC a 2-Stroke or a 4-Stroke technology? ... The technology is considered 2-Stroke, Direct Injection. Evinrude E-TEC in fact, has cleaner exhaust emissions than a 4-stroke, it produces 5 to 10 times less Carbon Monoxide (CO) while idling or trolling.
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What Is The Difference? A 4 cylinder engine contains 4 pistons while a 6 cylinder contains 6, all driving the power of your engine. The easy answer would be more cylinders equals more power. ... These engines are larger in size, and weigh more than a 4 cylinder, and offer more power, but less fuel economy.
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Essentially one complete cycle in a two-stroke engine demands one full crankshaft revolution or two piston strokes, whereas in a four-stroke engine the piston has to complete four strokes or two full crankshaft revolutions.
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A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction.
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Four Stroke Cycle Engines. A four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle. The piston make two complete passes in the cylinder to complete one operating cycle.
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A 4-pole motor has about 3.0 ft. -lbs of torque per horsepower where a 2-pole motor has 1.5 ft. ... At 60 Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm. Thus, the 4-pole motor provides higher efficiency, higher torque per unit of volume and weight.
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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. That being said, 2-stroke engines are more powerful. ... Two-stroke engines require pre-mixing of oil and fuel, while the 4-strokes do not.
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The two stroke oil will not hurt your four stroke mower in the least. Might make it last longer. There is no difference between "2-cycle" and "4-cycle" fuel except that 2-cycle engines use the fuel as a lubricant, so oil has to be mixed in with the fuel (gasoline).
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If you're in the market for a 50cc, 80cc or even a 125cc scooter, the question of whether to get a 2-stroke or 4-stroke scooter may be on your mind. ... So in a 2-stroke engine, the motor breathes in fresh air/gas, squishes that, ignites the mix and then expels the exhaust all in just two strokes.
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The two stroke engine is the main reason why PWC's are being banned around the nation. ... The combination of light weight and twice the power gives two-stroke engines a great power-to-weight ratio compared to many four-stroke engine designs.
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Simple science. The two stroke oil will not hurt your four stroke mower in the least. ... There is no difference between "2-cycle" and "4-cycle" fuel except that 2-cycle engines use the fuel as a lubricant, so oil has to be mixed in with the fuel (gasoline).
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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. That being said, 2-stroke engines are more powerful. Two-stroke engines are a much simpler design, making them easier to fix.