Subtopic: Selection, operation, maintenance and repair of I.C. engines
Question Statement:
For an in-line 4-cylinder four-stroke tractor diesel engine, which of the following represents the most widely used standard firing order to ensure dynamic balance and uniform torque pulses?
Options:
(A) 1-3-4-2
(B) 1-2-3-4
(C) 1-4-3-2
(D) 4-3-2-1
Answer Key:
A
Step-by-Step Solution & Explanation
In standard in-line 4-stroke 4-cylinder engines with a flat-plane ($180^\circ$) crankshaft (cylinders 1 and 4 moving together, and 2 and 3 moving together), the firing order 1-3-4-2 provides symmetrical torque impulses every $180^\circ$ of crank rotation with optimal dynamic balancing.