Page 124 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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108 Automobile mechanical and electrical systems

Figure 2.47 Firing order: 4-cylinder (left) and 6-cylinder (right) engines

Figure 2.48 V6 crank

V6 engine cylinder numbering is generally implemented in one of two ways.
The fi rst is that one bank has 1, 2 and 3 and the other bank has 4, 5 and 6. The
alternative numbering sequence uses alternate banks with 1, 3 and 5 on one side
and 2, 4 and 6 on the other. The fi ring orders are either one bank followed by
the alternate bank or one cylinder from one bank followed by a cylinder from the
other bank.

A V8 engine has four paired journals placed at 90° intervals to each other
( Fig. 2.49 ). Each journal carries one connecting rod from each of the opposite
banks. The cylinders can be numbered in a similar method to the six-cylinder
engines with either odd numbers on one side and even numbers on the other,
or 1–4 on one cylinder bank and 5–8 on the other bank. Typical fi ring orders are
shown in Fig. 2.50 .