Consider the following statements for a four stroke CI engine.
1. Combustion starts at 10 - 20° crank angle before the top dead center.
2. Exhaust valve opens at 40 to 30° crank angle before bottom dead center.
3. Intake valve opens at 5 -20° crank angle before top dead center at the end of the exhaust stroke
Which of the following statements are correct?
1
1 only
2
1 and 3 only
3
2 and 3 only
4
1,2 and 3