What is the firing interval of a six cylinder horizontally opposed engine?

What is the firing interval of a six cylinder horizontally opposed engine?

• A. 180
• B. 120
• C. 60
• D. 360

Answer: (B)

The firing interval of a six cylinder horizontally opposed engine is 120 degrees. This specific configuration means that each pair of opposing cylinders fires at intervals that create an even distribution of power strokes. In a six cylinder engine, the total possible rotation of the engine is 360 degrees. To determine the firing interval, divide this total rotation by the number of cylinders, which results in 360 degrees divided by 6 cylinders. This calculation gives you an interval of 60 degrees. However, because of the nature of the horizontally opposed engine, where pairs of cylinders fire simultaneously and balance the engine, they actually produce a firing interval of 120 degrees between each power stroke, providing an efficient and smooth operation. This design optimally balances the engine, reduces vibration, and minimizes the engine's overall footprint, which is beneficial in various automotive applications. Understanding the operation and firing sequence in such engines helps in diagnosing engine behavior and performance.

The firing interval of a six cylinder horizontally opposed engine is 120 degrees. This specific configuration means that each pair of opposing cylinders fires at intervals that create an even distribution of power strokes.

In a six cylinder engine, the total possible rotation of the engine is 360 degrees. To determine the firing interval, divide this total rotation by the number of cylinders, which results in 360 degrees divided by 6 cylinders. This calculation gives you an interval of 60 degrees. However, because of the nature of the horizontally opposed engine, where pairs of cylinders fire simultaneously and balance the engine, they actually produce a firing interval of 120 degrees between each power stroke, providing an efficient and smooth operation.

This design optimally balances the engine, reduces vibration, and minimizes the engine's overall footprint, which is beneficial in various automotive applications. Understanding the operation and firing sequence in such engines helps in diagnosing engine behavior and performance.