POR QUE Motor DIESEL tem mais torque que motor a gasolina? - Alta RPM

Summary

This video script discusses why diesel engines are preferred for heavy-duty trucks in Brazil. It explains that diesel engines produce more torque than gasoline engines, which is crucial for moving heavy loads. The script also touches on the technical aspects of diesel engines, such as longer piston strokes, high compression ratios, and direct fuel injection, all contributing to greater torque output. Additionally, it mentions that diesel engines are designed to be more robust and efficient, making them ideal for long-haul transportation and heavy-duty applications.

Takeaways

• 🚚 Diesel engines are preferred in heavy trucks in Brazil due to their higher torque output compared to gasoline engines.
• 🔧 Torque, not horsepower, is crucial for moving heavy loads, which is why diesel engines are more common in such vehicles.
• 📊 Diesel engines typically have a longer stroke and larger pistons, which contributes to their greater torque output.
• 🗜️ High compression ratios in diesel engines, along with turbocharging, lead to more efficient fuel use and increased torque.
• 💧 Direct diesel injection allows for better fuel-air mixture and more precise ignition timing, enhancing torque production.
• 🔥 Diesel fuel contains more energy per kilogram than gasoline, which contributes to the higher torque output.
• 🏭 Diesel engines are designed to be more robust to handle the high pressures and temperatures associated with their operation.
• 🔩 Diesel engines usually have lower RPMs and are optimized for maximum torque at lower speeds, making them ideal for heavy-duty applications.
• 🛣️ Companies often re-map diesel engines in buses to extract more torque for better performance under load and to reduce fuel consumption.
• ♻️ Remapping a diesel engine can lead to increased emissions if it's taken out of its optimal operating range for more power or fuel efficiency.

Q & A

Why do trucks in Brazil primarily use diesel engines?

Trucks in Brazil primarily use diesel engines because diesel engines produce significantly more torque compared to gasoline engines, which is essential for transporting heavy loads.

What is torque, and why is it more important than power for heavy transportation?

Torque is the force that causes rotation, and it is crucial for moving heavy loads because it helps the engine generate the necessary pulling power at lower speeds. Power, on the other hand, measures how fast work can be done, which is less critical for transporting heavy loads.

Why do diesel engines produce more torque than gasoline engines?

Diesel engines produce more torque due to several factors: they have longer piston strokes, higher compression ratios, turbocharging (increasing air intake), direct fuel injection, and diesel fuel itself contains more energy per unit of mass than gasoline.

How does the piston stroke length affect the torque in diesel engines?

Diesel engines typically have a longer piston stroke compared to gasoline engines, which creates a larger crankshaft lever arm. This longer stroke generates more torque by increasing the rotational force applied to the crankshaft.

What role does compression ratio play in a diesel engine’s torque production?

Diesel engines have much higher compression ratios than gasoline engines. A higher compression ratio allows the engine to compress more air into a smaller space, which increases the efficiency of the combustion process, resulting in greater torque.

What is turbocharging, and how does it affect diesel engine performance?

Turbocharging is the process of forcing extra air into the engine’s cylinders. In diesel engines, turbocharging increases the engine’s volumetric efficiency by allowing it to burn more fuel and air, which results in higher torque production.

Why do diesel engines generally operate at lower RPMs compared to gasoline engines?

Diesel engines are designed to produce high torque at lower RPMs, which makes them ideal for heavy loads and commercial vehicles. The longer piston strokes and higher compression ratios of diesel engines limit their ability to reach higher RPMs compared to gasoline engines.

How does direct fuel injection improve diesel engine torque?

In direct injection, diesel fuel is injected directly into the combustion chamber at high pressure. This allows for more precise timing and more complete combustion, which improves fuel efficiency and increases torque output.

What makes diesel fuel more energy-dense compared to gasoline?

Diesel fuel has a higher energy density than gasoline, meaning it contains more energy per unit of mass. This greater energy content allows diesel engines to produce more torque for the same amount of fuel burned.

Why do some companies 'remap' diesel engines in buses, and what are the benefits?

Companies remap diesel engines in buses to reduce engine torque, which helps save fuel and reduce wear on the engine and other components like the clutch and transmission. This leads to lower maintenance costs and increased longevity of the vehicle.