Lesson 1/Learning Event 1
FIGURE 5. I-HEAD ENGINE.
I-Head. In the I-head engine, both valves are in the cylinder head, and for this reason, it is sometimes called
an overhead valve engine. The valves may be arranged in a straight line, one directly behind the other as
shown in the picture. In this case, a straight line can be drawn through the valves and cylinder to form the
letter I. In other engines, the valves may be staggered with one on the right side of the cylinder and the other
on the left side. The letter I is no longer formed, but the classification is still the same.