2-Stroke Engines Diagram Quiz

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Questions and Answers

What is Top Dead Center (TDC)?

Position where the piston is closest to the cylinder head and spark plug and the combustion chamber is smallest.

What is Bottom Dead Center (BDC)?

Position where the piston is farthest from the cylinder head and spark plug and the combustion chamber is largest.

What is a Fuel/Air Mixture?

Explosive mixture in engines consisting of atomized fuel and air, created in the carburetor and enters the engine at the intake port or intake manifold.

What is a Spark Plug?

A device for igniting the fuel/air mixture in an internal combustion engine. Signup and view all the answers

What is Combustion?

The process of burning something; in engine theory, it is the explosion of the fuel/air mixture. Signup and view all the answers

What is an Engine Block?

Casting of iron or an aluminum alloy designed to keep all engine parts in alignment. Signup and view all the answers

What is a Piston?

An engine part found in the cylinder that is driven by the combustion of the fuel/air mixture and moves up and down to turn the crankshaft. Signup and view all the answers

What is a Crankcase?

The housing for the crankshaft and other related internal parts. In a 2-stroke, the fuel/air mixture is drawn into this space before transferring to the combustion chamber. Signup and view all the answers

What is a Combustion Chamber?

The enclosed space in which combustion takes place in an engine. It is located in the cylinder between the piston and cylinder head and spark plug. Signup and view all the answers

What is an Intake Port?

In 2-cycle engines, the opening to the crankcase where the fuel/air mixture enters. Signup and view all the answers

What is an Exhaust Port?

The opening from the cylinder where spent gases leave the engine in a 2-cycle engine. Signup and view all the answers

What is a Connecting Rod?

Link that attaches the piston to the crankshaft and transfers the up and down movement of the piston to rotational movement in the crankshaft. Signup and view all the answers

What is a Transfer Port?

In 2-cycle engines, it is the opening that allows the fuel/air mixture to pass into the combustion chamber from the crankcase. Signup and view all the answers

What is the Intake/Compression Stroke?

(2-cycle) Stroke where the piston is traveling from BDC to TDC. The piston travel creates negative pressure in the crankcase and draws fuel/air/oil mixture in through the intake port and reed valve. Fuel/air mixture in the combustion chamber is compressed. Signup and view all the answers

What is the Power/Exhaust Stroke?

(2-cycle) Stroke where the piston is traveling from TDC to BDC. The spark plug ignites the compressed fuel/air mixture in the combustion chamber forcing the piston downward. The exhaust port is uncovered allowing exhaust gases to escape through the exhaust port. Downward piston travel creates positive pressure in the crankcase which forces the fuel/air/oil mixture into the combustion chamber through the transfer port. Signup and view all the answers

What is Ignition?

The action of setting something on fire or starting to burn. In engines, the spark plug lights the compressed fuel/air mixture in the combustion chamber. Signup and view all the answers

What is a Crankshaft?

The major rotating part of the engine. It converts the reciprocating (back-and-forth) motion of the piston into rotary (circular) motion. Signup and view all the answers

What is the Fuel/Air/Oil Mixture?

(2-cycle) What is drawn into the crankcase, through the transfer port, and into the combustion chamber where it explodes to cause movement of the piston. Signup and view all the answers

Where is oil added to lubricate a 2-cycle engine?

In the fuel tank mixed with the fuel before being drawn into the engine. Signup and view all the answers

Study Notes

2-Stroke Engine Components and Processes

Top Dead Center (TDC) is the position of the piston closest to the cylinder head, resulting in the smallest combustion chamber.
Bottom Dead Center (BDC) is where the piston is farthest from the cylinder head, leading to the largest combustion chamber.
The fuel/air mixture is an explosive combination of atomized fuel and air created in the carburetor, entering through the intake port or manifold.
The spark plug ignites the fuel/air mixture within the combustion chamber of an internal combustion engine.
Combustion refers to the burning process, specifically the explosion of the fuel/air mixture in the engine context.
The engine block is a casement of iron or aluminum alloy that ensures proper alignment of all engine parts.
The piston moves within the cylinder, driven by combustion, facilitating the rotation of the crankshaft.
The crankcase houses the crankshaft and related internal components, drawing in the fuel/air mixture before combustion.
Combustion chambers are enclosed spaces in the engine where the burning of the mixture occurs, located between the piston and cylinder head.
The intake port is where the fuel/air mixture enters the crankcase in 2-cycle engines.

Engine Functionality

The exhaust port allows spent gases to exit the engine in 2-cycle engines.
The connecting rod links the piston to the crankshaft, transferring the piston’s vertical motion into rotational movement at the crankshaft.
Transfer ports enable the fuel/air mixture to pass from the crankcase into the combustion chamber in 2-cycle engines.
The intake/compression stroke occurs as the piston moves from BDC to TDC, creating negative pressure in the crankcase and drawing in the fuel/air mixture while compressing it in the combustion chamber.
The power/exhaust stroke happens when the piston travels from TDC to BDC, igniting the mixture and forcing the piston down, also uncovering the exhaust port to release gases.
Ignition is the process of starting combustion, initiated by the spark plug lighting the fuel/air mixture in the combustion chamber.
The crankshaft is crucial for converting the piston’s reciprocating motion into circular motion.
The fuel/air/oil mixture is drawn into the crankcase, then into the combustion chamber, where it explodes to produce piston movement.
Oil is added to the fuel to lubricate a 2-cycle engine, ensuring proper function and reducing wear.

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Description

Test your knowledge on the key components of 2-stroke engines. This quiz covers essential terms like Top Dead Center, Bottom Dead Center, and the Fuel/Air Mixture. Perfect for those looking to understand engine mechanics in detail.