About This Quiz
What's more powerful - a two-stroke engine or a four-stroke engine? Think you know? Prove your engine expertise by acing this quiz!
So, let's start with the basics. All engines have pistons that perform a specific number of strokes to complete a power cycle. Four-stroke engines complete the cycle with four strokes of the piston, resulting in two revolutions of the crankshaft. Two-stroke engines complete the cycle with two strokes of the piston, resulting in one revolution of the crankshaft. Two-stroke engines get the job done with fewer parts and are therefore lighter, which in turn makes the engine more efficient.
Because two-stroke engines are lighter, they are perfect for smaller gasoline engines, such as those used in lawnmowers, chainsaws and even model airplanes and motorcycles. But even when the weight factor does not come into play, two-stroke engines are more efficient, making them ideal for many applications. Even if you aren't particularly familiar with the difference between a two-stroke engine and a four-stroke engine, you'll know that you're operating a two-stroke engine when you are required to mix together the fuel and the oil.
So, you think you know enough about engines to ace this quiz? Let's get started.
Less ash makes burning the oil a little bit cleaner.
Hence the name.
The crankshaft makes one complete turn.
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It gets its blue tint from the oil that's blended into the fuel.
Dugald Clerk invented it in Scotland and patented his creation in England in 1881.
It combined compression with ignition during each revolution. Clerk succeeded where other inventors had already failed.
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They're often used in small power tools and light vehicles because of their power-to-weight ratio.
They are both open. Air pressure differences cause a fresh fuel/air mix to move into the combustion chamber.
Scott also had about 50 other patents to his name.
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Petroil, or two-stroke oil mixed with gasoline, makes the total-loss oiling system work
The lower number of parts in a two-stroke engine is the primary reason they tend to be lighter.
The 6-1 ratio is fairly low for small engines.
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The typical compression ratio is 12-to-1. Higher compression ratios generally mean more power.
It only fires once per revolution. This trait helps two-stroke engines produce more power, by weight, than four-stroke engines.
Gasoline ignition is especially common in the smallest two-stroke engines.
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Staying on top of lubrication is especially important in two-stroke engines.
Asymmetrical engine timing often results in better power output.
The emissions are higher in large part due to the oil that's mixed with the gasoline.
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Two-cycle oil is used in many small engines, from boat motors to chainsaws.
The point of the direct fuel injection is to reduce the amount of unburned fuel in the emissions, making them cleaner.
The 1970s saw significant improvements in piston-controlled inlet ports.
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You need 4 ounces of oil per gallon of gas, and it can be pricey, too.
The oil-fuel mixing process is mainly for smaller and cheaper two-stroke engines.
Their inefficient oiling methods mean less effective lubrication shorter engine life
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The upward stroke is the compression stroke, and the downward stroke is called the power stroke.
They leave clouds of smoke and trails of oil in the water.
The oil originates in the carburetor. It is mixed directly into the fuel.
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Two-stroke engines aren't really fuel efficient.
It seems bigger is better when it comes to the efficiency of two-stroke engines.
Peak power on these bikes occurs in a very limited range.
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