Understanding the Engines in Coach Buses: A Comprehensive Guide

When it comes to coach buses, the choice of engine is crucial for both performance and efficiency. This guide will explore the different engines in use, focusing on popular models and their specifications.

The Engines Behind Coach Buses

The engine in a coach bus is a critical component that determines its power, fuel efficiency, and overall performance. Here are some common engines used in coach buses, including examples from well-known manufacturers such as Prevost, MCI, and Van Hool.

High-Performance Engines

The Prevost X3-45 showcases a powerful Volvo D13 engine, which produces an impressive 435 horsepower (hp). Similarly, the MCI J4500 is equipped with a Cummins X-12 engine that can deliver 410 hp. These engines are ideal for passenger transport where high power and reliability are essential.

Popular Engine Choices

The choice of engine in a coach bus often depends on the brand, the original buyer, and the time period during which the bus was manufactured. Here are a few notable engines and brands:

Battery Electric and Hybrid Buses

In London, you can find a variety of buses powered by different types of engines, including:

Diesel engines - These are the most common and reliable for urban and long-distance transport. Diesel/hybrid engines - Combining the benefits of both diesel and electric power, these engines offer efficiency and low emissions. Plug-in diesel/hybrid engines - These are powered by both diesel fuel and electrical power from on-board batteries. They are known for their flexibility and reduced environmental impact. Hydrogen-powered engines - These engines are highly efficient and produce zero emissions. They are a promising technology but are less common due to infrastructure limitations. Battery electric engines - These are completely electric and powered by rechargeable batteries. They are gaining popularity due to their environmental benefits and lower operating costs.

It's important to note that there are no petrol (gasoline) engines used in buses in Europe, as they are not compliant with current emissions standards and regulations.

Modern Engine Trends

Most modern bus engines are 6-cylinder turbo diesels. These engines are renowned for their power and efficiency. While city buses tend to have less powerful engines to ensure lower emissions, tour coaches often feature more powerful options to accommodate longer routes and heavier loads.

Historical Engines

In the past, certain types of engines were more prevalent:

Leyland flat 6 diesel - This engine was popular in New Zealand due to its reliability and performance. Detroit two-stroke engines - Specifically, the 6V92 model was widely used, known for its durability and reliability. V6 and V9 Mercedes turbo diesels - These engines were favored in tour coaches for their power and efficiency.

While these engines are still available, their usage has decreased significantly. Today, inline six-cylinder turbo diesel engines remain the dominant choice in the industry due to their performance and efficiency.

Conclusion

Coach buses are equipped with a variety of engines, each designed to meet specific performance and efficiency requirements. Whether you're looking at high-performance engines like the Volvo D13 and Cummins X-12, or more modern turbo diesel engines, the choice of engine plays a crucial role in the overall performance of the bus.