Question

Minimum number of cylinders in in-line 4 stroke engine required to balance completely

• A. 2
• B. 4
• C. 6
• D. 8

Answer 1

The correct option is C 6



2 cylinder
$\text{Phase change is}{180}^{\circ }$
Primary force and secondary force only balanced

4 cylinder
Secondary force is unbalanced

6 cylinder
Firing order 1-4-2-6-3-5
And phase change is 120${}^{\circ }$
Force polygon
$1\to 0^{\circ },$
$2\to {240}^{\circ },$
$3\to {120}^{\circ },$
$4\to {120}^{\circ },$
$5\to {240}^{\circ },$
$6\to 0^{\circ },$