### Valve Timing Diagram of Diesel Engine

Valve Timing Diagram for a Four Stroke Cycle Diesel Engine - The diesel engines are also known as compression ignition engines. The valve timing diagram for a four stroke cycle diesel engine is shown in Figure below:

The following particulars are important for a four stroke cycle diesel engine regarding valve timing diagram:

(a) The inlet valve opens at 10° — 20° before TDC and closes at 25° — 40° after BDC.

(b) The fuel valve opens at 10° — 15° before TDC and closes at 15°— 20° after TDC.

(c) The compression starts at 25° — 40° after BDC and ends at 10°— 15° before TDC.

(d) The expansion starts at 10° — 15° after TDC and ends at 30° — 50° before BDC.

(e) The exhaust valve opens at 30° — 50° before BDC and closes at 10° —15° after TDC.

Note: In diesel engines, the fuel is injected in the form of very fine spray into the engine cylinder, which gets ignited due to high temperature of the compressed air.

1. what changs are required in the 4 stroke diesal engine

### Are Engineers Favourite Among Girls?

What do girls think about men who are engineers and what type of engineers are most favourite among girls? A survey was conducted by a team of aboutmech with members chosen from different countries. Each team member carried out a neutral survey in his/ her country to evaluate what females think about most of the engineers from different engineering branches. An overview of different questions asked in survey is given below: Question: Which male engineers do you find more attractive as a husband? Almost 50% women voted for mechanical engineers to be the most attractive husbands among other engineers. So mechanical engineers are most favourite among girls as a husband. They find them more trustworthy, intelligent, and creative. A married women from California said, “If your husband is a mechanical engineer, he will help you in everyday tasks. Because mechanical engineers are good team players and they have creative ideas about everything.” Which male engineers do you find more