question_answer

Consider the following measures:

1. Increasing the compression ratio.

2. Increasing the intake air temperature.

3. Increasing the length to diameter ratio of the cylinder.

4. Increasing the engine speed.

The measures necessary to reduce the tendency to knock in CI engines would include:

A) 1, 2 and 3                     

B) 1, 2 and 4

C) 1, 3 and 4                     

D) 2, 3 and 4