Understanding Diesel Engine Cycles and Revolutions

[mech-eng]

Homework Statement

In a diesel engine each cycle takes two revolutions and there are 6 cylinders.

Homework Equations

what does " each cycle takes two revolutions" mean and are there a relation or equation between
cylinder number and calculation of engine power?

The Attempt at a Solution

 

[SteamKing]

In the four-stroke diesel cycle, it takes two revolutions of the crankshaft to:
1. Draw in the air for combustion. (piston goes down)
2. Compress the air (piston goes up)
3. Fuel ignites and expands (piston goes down)
4. Exhaust combusted fuel from the cylinder (piston goes up).

There is also a two-cycle process, where all of the above can be accomplished during one revolution of the crankshaft.

http://en.wikipedia.org/wiki/Diesel_cycle

http://en.wikipedia.org/wiki/Two-stroke_engine

http://en.wikipedia.org/wiki/Four-stroke_engine