Question

The common firing order of a 4-stroke, 6 cylinder diesel engine is

• A. 1-2-3-4-5-6
• B. 6-5-4-3-2-1
• C. 1-5-3-6-2-4
• D. 2-1-4-3-5-6

Hint:

For 6 cylinders: 1-5-3-6-2-4. For 4 cylinders: 1-3-4-2.

Answer 1

The Correct Option is C

Step 1: Concept Firing order is the sequence in which the power stroke occurs in the cylinders of a multi-cylinder engine.

Step 2: Meaning The order is chosen to minimize vibration and ensure smooth engine operation by balancing the forces on the crankshaft.

Step 3: Analysis For an in-line 6-cylinder engine, the firing strokes are timed to occur every $120^{\circ}$ of crankshaft rotation. The most standard and widely used sequence is 1-5-3-6-2-4.

Step 4: Conclusion 1-5-3-6-2-4 is the common firing order.
Final Answer: (C)