Engine Performance
Work Example 21

WorkKey Level: 4
NATEF Automotive Tasks:

Problem:

Using the attached pictures, answer the following questions.

A.	B.

1. How many cylinders would you assume this engine that is being analyzed on the oscilloscope has?
   a. one
   b. two
   c. four
   d. eight
   e. twelve

2. On pattern A, which trace looks more unlike any other?
   (Traces are numbered from bottom to top.)
   a. one
   b. five
   c. six
   d. seven
   e. eight

3. On pattern B, which trace looks more unlike any other?
   (Traces are numbered from bottom to top)
   a. one
   b. five
   c. six
   d. seven
   e. eight

Solution :

1. D, since there are 8 lines, there are 8 cylinders.
2. D, #7 from the bottom is mssing the spark line.
3. D, #7 from the bottom has a longer spark line.