detroit 71 series

Detroit Diesel 71 Series: A Legendary Engine Explained

The Detroit Diesel 71 Series is a two-stroke diesel engine known for its distinctive sound, durability, and widespread use in various applications. Introduced in 1938, these engines were a staple in trucks, buses, construction equipment, and even marine applications for decades. Their modular design, with individual cylinder heads, contributed to their ease of maintenance and adaptability.

What is the Detroit Diesel 71 Series?

The Detroit Diesel 71 Series refers to a family of two-stroke diesel engines manufactured by Detroit Diesel Corporation (now Detroit Diesel). The “71” denotes the cubic inch displacement per cylinder. These engines were available in inline (2, 3, 4, and 6 cylinders) and V configurations (6, 8, 12, and 16 cylinders), offering a wide range of power outputs. Unlike four-stroke engines, two-stroke engines complete a power cycle with each revolution of the crankshaft, resulting in a higher power-to-weight ratio.

Key Features and Characteristics

Several features contributed to the popularity of the Detroit Diesel 71 Series:

• Two-Stroke Design: Provides high power output for its size.
• Unit Injectors: Each cylinder has its own fuel injector, contributing to efficient combustion.
• Blower: A mechanically driven blower provides air to the cylinders for scavenging and combustion.
• Modular Design: Individual cylinder heads allow for easy maintenance and repair.
• Distinctive Sound: The engine’s unique two-stroke cycle and blower create a characteristic “Detroit Diesel” sound.

Applications of the 71 Series

The versatility of the 71 Series made it suitable for a wide array of applications. Here are some notable examples:

• Trucks and Buses: Provided reliable power for commercial vehicles.
• Construction Equipment: Used in bulldozers, excavators, and other heavy machinery.
• Marine Applications: Powered boats, yachts, and work vessels.
• Industrial Equipment: Employed in generators, pumps, and compressors.

Legacy and Impact

Although production of the original 71 Series ended in the 1990s, its impact on the diesel engine industry is undeniable. Its simple yet robust design and widespread use cemented its place in history. Enthusiasts still maintain and operate these engines today, appreciating their reliability and iconic sound. For more information, you can check out the Detroit Diesel Series 71 Wikipedia page.

Frequently Asked Questions (FAQs)

What does the “71” in Detroit Diesel 71 Series mean?

The “71” refers to the cubic inch displacement of each cylinder in the engine.

What is the difference between a two-stroke and four-stroke diesel engine?

A two-stroke engine completes a power cycle in one revolution of the crankshaft, while a four-stroke engine requires two revolutions.

Why did the Detroit Diesel 71 Series have a blower?

The blower provided air to the cylinders for scavenging exhaust gases and ensuring proper combustion in the two-stroke cycle.

Are Detroit Diesel 71 Series engines still being manufactured?

The original Detroit Diesel 71 Series is no longer in production, although parts and support may still be available.

What made the Detroit Diesel 71 Series so reliable?

Its simple design, unit injectors, and robust construction contributed to its reputation for reliability and longevity.

Summary

The Detroit Diesel 71 Series is a legendary two-stroke diesel engine renowned for its durability, distinctive sound, and widespread use. Its modular design and high power output made it a popular choice for trucks, buses, construction equipment, and marine applications. Although no longer in production, the 71 Series remains a significant part of diesel engine history.