The reasons why motorbikes do not use Diesel engines

Why Motorcycles Don't Use Diesel Engines

Hello everyone, I wish you a very lucky day, nice to see you again in this video. Friends, today, I would like to raise a problem that as you all know, in Vietnam in particular and in developing countries in general, the percentage of motorbikes is still quite high. is high in the total means of transportation of the people.

And it is forecasted that in the coming years, this rate will still be quite high, but one thing we have noticed is that motorcycles usually only use gasoline engines, while Diesel engines are also known as diesel engines. As a diesel engine, it has higher efficiency than gasoline engines, the price of Diesel fuel is cheaper than gasoline.

Diesel fuel also does not ignite at normal temperatures, so it is less dangerous than gasoline, in addition, the Diesel engine is less prone to minor damage. Because it doesn't have an igniter and carburetor…etc... a lot of reasons, in general, a Diesel engine has many advantages over such a gasoline engine.

But why do manufacturers not install diesel engines on motorcycles? Well, this is also a question asked by a friend on the automobile and motorcycle forum, I followed it the other day, so today I would like to give you some of the main reasons why Diesel engines are not used on the internet. motorbike, saying it is not used is not correct. Because in fact, in the past, there were also motorcycle models equipped with Diesel engines, but now it will be very difficult for us to find a motorcycle that uses Diesel engines, then the following Here are a few of the main reasons:

• Firstly, because the diesel engine works on the principle that the air is compressed at high temperature and pressure, then the new Diesel fuel is injected into the combustion chamber, when Under such high pressure and high temperature, the Diesel oil itself ignites and does work. It doesn't need an ignition system like a gasoline engine does, so it needs a very high compression ratio. Normally, the compression ratio of diesel engines falls between 15 and 24, while for gasoline engines it is only about 8 to 13.

Well, first of all, I would like to talk about the compression ratio a bit, when the piston works in the cylinder, it has 2 limit positions that are the upper dead center position and the lower dead center position, then When the piston is at the bottom dead center, the volume that the combustion chamber is then it will be the largest, and when the piston goes to the upper dead center, the volume of the combustion chamber at this it is the smallest. Then the compression ratio it will be equal to the largest volume divided by the smallest volume, so to have a high compression ratio, it must be the volume of the combustion chamber when its piston is at the point position. the dead bottom must increase, then as that volume increases one can increase the diameter of the cylinder, or increase the length of the cylinder.

Therefore, it will lead to an increase in the size and mass of the Diesel engine, which is also why the same power is produced, the Diesel engine is always heavier and larger. gasoline engine. That's why, the integration of such a large engine on a small motorcycle is not suitable compared to our use of gasoline engines.

• Secondly, due to the problem of needing a high compression ratio of the Diesel engine, the length of the cylinder also increases, the length of the cylinder increases, it will lead to a groaning arm. and the length of the crankshaft also increases, then in terms of mechanics, the piston of a Diesel engine will fluctuate in a wider range than it does for a gasoline engine, that's why is that it will vibrate more and noisier than the gasoline engine. In cars today, there is technology that can handle this vibration and high noise, but to handle this noise of Diesel engines that are installed on motorcycles or motorcycles. a small car is very difficult.

• The third is the problem of the cost of Diesel engine and the cost of repairing it will be higher than that of gasoline engines, so why is that? Because the diesel engine will operate at a very high temperature and pressure, that's why the material that makes up the Diesel engine, it needs to be better and more durable than the diesel engine. gasoline engine. The second is that although the structure of the diesel engine is simpler than that of the gasoline engine, some parts and details require higher precision, such as the fuel pump system. The data of the diesel engine requires more sophisticated precision, so it is also more expensive than the ignition system on the gasoline engine.

• Also due to the structural nature of the diesel engine, when it works, the piston it will have to work over a longer distance, hence the crank arm and crankshaft, the length. of the crankshaft it will be larger than that of the gasoline engine, then the traction or more precisely the torque of the diesel engine will be greater than that of the gasoline engine. But since the acceleration of the diesel engine is lower than that of the gasoline engine, that is, its power is lower than that of the gasoline engine, then the diesel engine in general is more suitable than the gasoline engine. For large motor vehicles, a large towing capacity is required. For example, a truck or a large SUV, but for a small car or a motorbike, the… it is not suitable, especially for motorbikes, motorbikes are not. it needs acceleration more than traction.

• Diesel engine operates at high pressure and high temperature, so its cooling mode should be better than gasoline engine. If you do well the problem of heat dissipation for the diesel engine, then the diesel engine is quite bulky and the cost increases a lot.

• Diesel engine though does not have the spark plug system like a gasoline engine, or it doesn't have a carburetor like a gasoline engine. However, the system that pumps fuel for the diesel engine is usually more expensive than the gasoline engine, so if you consider the cost, it is more expensive.

• Currently, the diesel engine wants to work well in extreme weather conditions, especially when the weather is cold, the diesel engine is often difficult to start, so on modern cars today it is they equipped the system to dry the air so that it heats up during startup. It is not appropriate to install such a kit for motorbikes, because a motorbike is a vehicle that requires a cheap price and meets the majority of consumers, so it is If you want a diesel engine that works optimally on motorcycles and yet needs to install so many things, then in terms of cost alone, it's already unreasonable. Not to mention that it will make our engine system cumbersome and much more complicated.

• Currently, Diesel engines want to operate efficiently, usually car manufacturers often have a turbocharger to pump more air into the cylinder, increasing the efficiency of fuel combustion. Well, like the one I mentioned above, if it is integrated with so many things, it will be very cumbersome, but its price is quite high, especially for these turbochargers, its price will be quite high.

• One last reason that I think is that for developing countries like Vietnam, it is not very demanding, that is, diesel engines emit more toxic fumes than gasoline engines, Therefore, in some countries it has a high requirement for environmental laws, if you want to use a diesel engine on vehicles, the engine needs to be fitted with a catalyst, so that If you want to install this catalyst on a motorcycle, it's not reasonable anymore.

So above, I mentioned a few reasons, which in my opinion can explain the question of why diesel engines are not used on motorcycles today, I took a wallet. For example, the German motorcycle company Royal Enfield, they were very successful in the past in producing motorcycles using Diesel engines, but later due to the limitation of Diesel engines, they were have replaced all of their motorcycles with gasoline engines.

Then my video comes here, I would like to pause, sincerely thank you for watching, if you have any suggestions, please comment below vi-di- oh, hello and see you in my next video clips!