Ignition
The vacuum that sucks in the air/ fuel mixture is caused by what?
Downward stroke of the piston
Small engines convert linear energy into what kind?
Rotary energy
What are the valves doing on the intake stroke
Intake open
Exhaust closed
Connects piston to crankshaft
Connecting rod
the precise moment spark occurs is called
Ignition timing
What type of engine is defined as an engine where the air/fuel are burned within the engine?
Internal combustion
What is mounted to the block to cover the combustion chamber?
Head
What are the valves doing on the compression stroke
Intake closed
Exhaust closed
the top half of the engine block is called
Cylinder block
what 3 categories can a small engine's operation be divided into
Ignition
Compression
Carburation
What is the total distance the piston moves from TDC to BDC?
Stroke
These provide a tight seal between piston and cylinder?
Compression rings
What are the valves doing on the power stroke
Intake Closed
Exhaust Closed
the bottom half of the engine block is called
Crankcase
TDC stands for what
Top Dead Center
What happens when you compress the air/fuel mixture?
Increases the temperature
What is considered the backbone of the engine?
Crankshaft
What are the valves doing on the exhaust stroke
Intake closed
Exhaust open
Mounts to the engine block to cover the combustion chamber
Head
What is the job of the valve springs
To hold the valves in the closed position
List the 4 strokes in order of the 4 stroke engine
give piston position and valve position
Intake stroke, down, Intake open Exhaust closed
Compression stroke, up, Both closed
Power stroke, down, Both closed
Exhaust, up, Intake closed Exhaust open
What 2 things are used to reduce friction between moving parts?
oil and bearings
What is it called when both valves are open at the same time
Name 4 parts that keep the combustion chamber air tight
Head and gasket
Valves
Piston head and rings
Spark plug
What causes the piston to continue moving during all strokes except the power stroke
Momentum of the flywheel and crankshaft