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Page 1: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Engine

Cycles

Engine

Cycles

Engine

Cycles

Engine

Cycles

Page 2: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

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Page 3: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Introduction to Engine Cycles

•For an engine to operate,

a series of events must occur in a “specific sequence”

Page 4: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

This “Series of Events” is as follows:

1.Fill the cylinder with a combustible mixture. This is referred to as “INTAKE”.

2.Compress this mixture into a smaller space. This is referred to as “COMPRESSION”

3.Producing Power, the mixture ignites which causes it to expand. “POWER”

4.Exhaust the burnt gases from the cylinder. “EXHAUST”

Page 5: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

The result of these events is power.

• To produce sustained power, the engine must repeat this sequence over and over again.

•One complete series of these events in an engine is called a cycle.

Page 6: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Engine Cycles

• Most engines have one of the two types of cycles:

–Four-Stroke Cycle

–Two-Stroke Cycle

Page 7: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Four-Stroke Cycle

What are those 4 parts to the cycle again?

Page 8: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Four-Stroke Cycle

• In the four-stroke cycle engine, there are four strokes of the piston, up & down then up & down again during each cycle.

• Then it starts over again on another cycle of the same four strokes.

• This cycle occurs during two revolutions of the crankshaft.

• Most engines today operate on the four-stroke cycle.

Page 9: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Four Stroke Cycles

Page 10: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

4-Stroke Cycle Engine in Action

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Page 11: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Intake Stroke• The intake stroke starts with the piston

near the top and ends shortly after the bottom of its stroke.

• The intake valve is opened, allowing the cylinder to receive the fuel-air mixture as the piston moves down.

• As the piston moves down, it creates a vaccuum

• The valve is then closed, sealing the cylinder.

Page 12: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Compression Stroke

• The compression stroke begins with the piston at the bottom of the cylinder and rises up to compress the air-fuel mixture.

• Compressed air-fuel is easier to ignite!

• Since the intake and exhaust valves are closed, there is no escape for the fuel-air mixture and it is compressed to a fraction of its original volume.

Page 13: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Power Stroke• The power stroke begins when the

piston almost reaches the top of its stroke and the fuel-air mixture is ignited.

• As the mixture burns and expands, it forces the piston down.

• The piston being pushed down creates power!

• The valves remain closed so that all the force is exerted on the piston.

Page 14: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Exhaust Stroke

• The exhaust stroke begins when the piston nears the end of its power stroke.

• The exhaust valve is opened and the piston rises, pushing out the burned gases.

• When the piston reaches the top, the exhaust valve is closed and the piston is ready for a new four-stroke cycle.

Page 15: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Advantages of 4-Stroke

• good fuel economy

• quiet

Page 16: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Dis-advantages of 4-Stroke

• more moving parts

• expensive to make

Page 17: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Examples of Four-Stroke Cycle Engines

• Cars

• Trucks

• Tractors

SCOOTERS!!!

Page 18: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

So, that was the theory. Let’s see

these engines work

Page 19: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

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Page 20: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Camshaft & OHV

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Page 21: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

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Page 22: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

OHV with pushrods.

No Overhead Cam

Note: Electrical

Points, Condenser, Coil,

and Battery QuickTime™ and a

decompressorare needed to see this picture.

Page 23: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Engine Cam

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Page 24: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”
Page 25: Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Any Questions


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