How A Motorcycle Engine Works

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How A Motorcycle Engine Works – Modern bike engines are packed with a lot of technology – sometimes you need a dictionary to translate the manual. But if you don’t know how the motor works, it can be a bit scary.

But the good news is that today’s engines still work on the same principles as the German (who probably knew him) Nikolaus Otto built the first one in 1876. And that’s more than most pub professionals already know, so we’re off to a good start.

How A Motorcycle Engine Works

How A Motorcycle Engine Works

The story begins with a bang in a small closed room. A bang is not an explosion; It is a controlled combustion of a mixture of gasoline and air – gasoline is sprayed into the chamber through an injector and air comes from the atmosphere. Bang/burn is also known as combustion, as in “internal combustion engine”. And the small enclosed space is called the combustion chamber.

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There is a spark plug in the roof of the combustion chamber which creates sparks, i.e. ignites the fuel/air mixture and initiates combustion. This part is called ignition.

Flammable gases spread quickly in small spaces. The floor of the combustion chamber is actually the top of the piston and fortunately it slides down inside the walls of the cylinder – known as the “cylinder”. Say what you will about engineers, but they are logical.

The piston is connected to a rod called a “connecting rod” (see?) – a compressed structure or simply a rod. The rod is connected to a type of large axle called a crank. As combustion pushes down on the piston and rod, they turn the crank.

The momentum of the crank (which is relatively heavy) now moves the control rod and piston back up the cylinder. This is useful because in doing so it pushes all the burnt exhaust gas out of the cylinder through the small valves that are just open and exhaust the exhaust gas. Here’s the tricky part – valve opening and closing is controlled by a chain that runs from the crank to the spindle (or camshaft) above the valves and precisely opens them when needed.

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Ah well, so far so good. But the work is half done. We need to get more gasoline and air into the combustion chamber.

Now we have the piston again at the top of this movement. But the crank still has momentum and is still turning and starts pulling the piston back in the cylinder – a perfect opportunity to open another pair of valves (driven by another camshaft) and pull the descending piston at low pressure. A fresh pulse of fuel/air mixture into the cylinder is like drawing blood into a syringe.

Once again the piston reaches the bottom of its stroke and the cylinder above it is filled with a swirling fuel/air mixture. Still driven by the momentum of the crank, the piston begins to rise again, a second time, which compresses the mixture. When the piston reaches the top, the spark plug sparks again, igniting the mixture and pushing the piston back up the cylinder.

How A Motorcycle Engine Works

So this is a complete cycle of an internal combustion engine. Once you do the math, you’ll realize that the piston actually makes two upstrokes and two downstrokes per cycle – hence the name four-stroke (there are many other types of engines – two-strokes, Wankels, diesels, etc. – but almost all modern bicycle engines are four-strokes) .

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The four beats are often shortened to catchy verbs: bang, hit, suck, squeeze, in the order described above (but more often suck, squeeze, bump, blow, because it rolls off the tongue better).

Now we only have a piston that moves up and down and a crank that rotates. How does this make the wheel move forward?

As you can see, the four-stroke cycle described above happens very quickly. Unbelievable speed. When your bike is ticking, the crank is spinning at about 1,200 rpm. That’s 600 suctions, 600 squeezes, 600 bangs and 600 strokes per minute (because each is half a crank turn). And that’s about the cylinder.

So the crank spins very fast, but if you chain it to the rear wheel, there’s enough power to drive the motorcycle very, very slowly, and to do that, he loosens the nuts. If you imagine yourself shifting into first gear on a pusher, you’re trying to pedal downhill; Same thing.

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We have to shift our scooter into high gear anyway. We need a gear system to reduce the speed of the crank, and then, a phenomenon called mechanical advantage, actually increases the power (also known as torque) to the point where we can ride the bike at decent speeds, but reasonably with more engine. We want to trade high crank speed and low torque for low crank speed and high torque.

Ah, how about a gearbox? So at the end of the crank is a pinion or gear that turns a bunch of other gears of various sizes – and we can choose which one we want using a clever mechanism called a gear lever – before the drive appears, more slowly but much more. Powerfully, in the output gear – and where we can hook the chain around it and drive the rear wheel.

This is a drawing of the Triumph Trophy engine. You will see three pistons in a row, each at the end of the control rod and turning the bottom crank. You can also see the two intake and exhaust camshafts that actuate the valves at the top of the engine. A large gear behind the clutch basket picks up power from the crank and sends it to the gearbox – a collection of gears. The output of the drive is the helical bevel gear on the lower right. The trophy has a shaft drive and you can see its helical bevel gear that takes the output of the gearbox.

How A Motorcycle Engine Works

Of course, all of the above only describes a piston, rod and cylinder process. You know that bicycles can have one, two, three, four, often not five, sometimes six cylinders. They can be arranged in weird and wonderful ways – side by side (parallel twins or inside triplets, fours or sixes), V-shaped (V-twin or V-four) or facing each other (flat twin, flat four, flat even six).

How Does A Motorcycle Engine Work?

The number of cylinders and their arrangement play a big role in determining not only the character of your engine (how it vibrates and delivers its power when you open the throttle), but also handling and size. – from your bicycle. Because of this, certain cylinder configurations are better suited for certain types of riding – so single cylinders work well on dirt bikes, but not so well on touring bikes. V-fours make good sports engines, but lousy off-road engines.

Of course, this is just a basic overview of how your bike engine works. Each engine has its strengths and its design quirks; It can be supercharged or with variable valve technology or a semi-automatic transmission.

The beautiful thing about a four-stroke engine is that you can look at a drawing or animation of it on YouTube and suddenly understand the magical relationship between the piston, rod, crank, camshaft and valves. It’s a special moment that inspires a lifetime of engineering. It was the same eureka moment that inspired the once mighty Soichiro Honda – and every other engine builder, big or small. How it works: In his latest dispatch from the motorcycle clutch shop, Panhead Jim walks us through some tips. And the motorcycle clutch – how it works and why it’s such a complicated subject.

Whether you use your foot or hand to steer it, we all know that when we press the clutch, our motorcycle engines transfer power to the transmission and ultimately to the rear wheel. What actually happens when you engage or disengage the clutch is a mystery, but I’ll walk you through how the clutch works using my 1933 Harley-Davidson VL as an example. Although this machine uses a foot clutch instead of the modern manual clutch, the working principles are still the same.

Crash Course In Understanding How A Motorcycle Engine Works

The heart of the clutch mechanism is a stack of alternating plates. The number of plates varies between different types of clutches, but regardless of the number, you will have a combination of fiber and steel plates. Fiberboards consist of a layer of material bonded or riveted to both sides of a metal core. The material was originally asbestos, but today it has been replaced by organic resins. Any material, its unique

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