Principles of Two and Four Stroke Cycle Engines

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What is the primary function of the intake event in a four-stroke cycle engine?

To remove the burned and unburned gases from the cylinder

To fill the cylinder with air or air and fuel (correct)

To compress the air or air/fuel mixture into a smaller space

To generate power through the combustion of air and fuel

In a two-stroke cycle engine, how many degrees of crankshaft rotation are required to complete one cycle?

270°

360° (correct)

540°

180°

What is the position of the piston at the beginning of the compression stroke in a four-stroke cycle engine?

TDC

ATDC

BDC

BTDC (correct)

In a diesel engine, what event occurs towards the end of the compression stroke?

Injection Signup and view all the answers

What is the purpose of the power event in a four-stroke cycle engine?

To generate power through the combustion of air and fuel Signup and view all the answers

What is the position of the piston at the beginning of the exhaust stroke in a four-stroke cycle engine?

ABDC Signup and view all the answers

At what crankshaft angle does the fuel injection occur in a diesel engine?

23° BTDC Signup and view all the answers

What happens when the exhaust valve opens in a four-stroke cycle engine?

Exhaust gases escape under pressure Signup and view all the answers

What is the term for the period when both the intake and exhaust valves are open in a four-stroke cycle engine?

Valve overlap Signup and view all the answers

Why does a four-stroke cycle engine produce more power than a two-stroke cycle engine for a given displacement?

Because it has a longer effective power stroke Signup and view all the answers

What is the approximate length of the effective power stroke in a four-stroke cycle engine?

120 to 140 degrees of crankshaft rotation Signup and view all the answers

Why are two-stroke cycle diesel engines being replaced in mobile equipment and truck applications?

Because they have inherently higher exhaust emissions Signup and view all the answers

What is a common characteristic of heavy-duty two-stroke cycle engines?

Use of intake ports machined into the cylinder or liner Signup and view all the answers

What is the primary purpose of scavenging in a two-stroke cycle engine?

To remove exhaust gases from the cylinder Signup and view all the answers

What is the characteristic of crankcase scavenging in small gasoline engines?

Pressurizes air and fuel in the crankcase Signup and view all the answers

What is the function of the exhaust valves in a two-stroke cycle engine?

To allow exhaust gas removal Signup and view all the answers

What is the timing of the injection of fuel in a two-stroke cycle diesel engine?

At 21° BTDC Signup and view all the answers

What is the purpose of a blower in a two-stroke cycle engine?

To pressurize the inlet air Signup and view all the answers

How many revolutions of the crankshaft are required to complete one cycle in a four-stroke cycle engine?

Two revolutions Signup and view all the answers

Principles of Two and Four Stroke Cycle Engines

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Questions and Answers

What is the primary function of the intake event in a four-stroke cycle engine?

In a two-stroke cycle engine, how many degrees of crankshaft rotation are required to complete one cycle?

What is the position of the piston at the beginning of the compression stroke in a four-stroke cycle engine?

In a diesel engine, what event occurs towards the end of the compression stroke?

What is the purpose of the power event in a four-stroke cycle engine?

What is the position of the piston at the beginning of the exhaust stroke in a four-stroke cycle engine?

At what crankshaft angle does the fuel injection occur in a diesel engine?

What happens when the exhaust valve opens in a four-stroke cycle engine?

What is the term for the period when both the intake and exhaust valves are open in a four-stroke cycle engine?

Why does a four-stroke cycle engine produce more power than a two-stroke cycle engine for a given displacement?

What is the approximate length of the effective power stroke in a four-stroke cycle engine?

Why are two-stroke cycle diesel engines being replaced in mobile equipment and truck applications?

What is a common characteristic of heavy-duty two-stroke cycle engines?

What is the primary purpose of scavenging in a two-stroke cycle engine?

What is the characteristic of crankcase scavenging in small gasoline engines?

What is the function of the exhaust valves in a two-stroke cycle engine?

What is the timing of the injection of fuel in a two-stroke cycle diesel engine?

What is the purpose of a blower in a two-stroke cycle engine?

How many revolutions of the crankshaft are required to complete one cycle in a four-stroke cycle engine?

What is the timing of the intake valve opening in a four-stroke cycle diesel engine?

What is the characteristic of the camshaft in a four-stroke cycle engine?

What is the purpose of the compression stroke in a two-stroke cycle engine?

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