question_answer

Which of the following factors increase detonation in the SI engine?

1. Increase spark advance.

2. Increased speed.

3. Increased air-fuel ratio beyond stoichiometric strength.

4. Increased compression ratio.

Select the correct answer using the codes given below:

Codes:

A) 1 and 3            

B) 2 and 4

C) 1, 2 and 4                     

D) 1 and 4