Fundamentals of the Diesel Cycle

Question 1

A diesel engine is a type of heat engine that uses the internal combustion process to convert the energy stored in the chemical bonds of the fuel into useful mechanical energy. This occurs in two steps

Answer 1

1. Fuel reacts chemically and releases energy in the form of heat
2. The heat causes gasses trapped in the cylinder to expand, and the expanding gases, being confined by the cylinder, must move the piston to expand.

Question 2

To convert the chemical energy of the fuel into useful mechanical energy all internal combustion engines must go through four events.

Answer 2

1. Intake
2. Compression
3. Power
4. Exhaust

Question 3

All diesel engines fall into two categories, what are those?

Answer 3

Two-stroke engine
Four-stroke engine

Question 4

This engine requires four strokes of the engine (intake, compression, power, and exhaust) to complete a one full cycle

Answer 4

Four-stroke engine

Question 5

In this engine, it only takes two-stroke to complete a one full cycle

Answer 5

Two-stroke

Question 6

_____ is required to move exhaust gas out of the cylinder and fresh air into the cylinders, to compress the air, to fuel inject, and to burn the fuel.

Answer 6

Time

Question 7

if a four-stroke diesel engine is running constant at _____, the crank would be rotating at ______ or _____ per second.

Answer 7

2100 rpm
35 revolutions
12,600 degrees

Question 8

In a four-stroke engine, the camshaft is geared so that it rotates at half the speed of the crankshaft (1:2). This means that the crankshaft must make ______ before the camshaft will complete ______.

Answer 8

two complete revolutions
one revolution

Question 9

Before top dead center (BTDC), as measured by crankshaft rotation, the camshaft lobe starts to lift the ___?

Answer 9

Cam follower