B3U1 Engine Systems Flashcards
What is the purpose of the engine block?
It houses all of the internal components of the engine.
What are the main journals?
The round surfaces on which the crankshaft rotates.
What two categories do rings fall?
(1) Compression.
(2) Oil.
Why does the cylinder head contain elaborate coolant passages?
To help remove heat from the combustion chamber.
Describe the movement in an engine’s stroke.
It can be in either direction, up or down.
What are the events for an engine?
Intake, compression, ignition, power, and exhaust.
To what does compression ratio refer?
The comparison in the volume of the combustion with the piston at BDC to the volume of the combustion chamber with the piston at TDC.
What does a two stroke engine use to pressurize the air in the air box?
External Blower
To what temperatures does compression causes the air in the combustion chamber to increase?
Above 1000 Degrees F
When is fuel injected into the cylinder?
Just before TDC
Why do four stroke engines not require an external blower?
A four stroke generated vacuum with the downward movement of the piston.
What components make up the battery ignition system?
(1) Battery.
(2) Ignition switch.
(3) Ignition coil.
(4) Breaker points.
(5) Condenser.
(6) Distributor.
(7) High-tension wire.
(8) Spark plug.
What does the secondary coil having more coils than the primary coil cause?
The secondary coil to build up much more voltage, up to about 25,000 volts, than the primary coil.
What does the fuel filters do?
Removes dirt and foreign particles from the gasoline.
What is the venturi?
The venturi is a restriction in the air passage.
What does the throttle valve do?
Regulates the amount of air/fuel mixture entering the cylinders by restricting the passage
Of what materials are gaskets made?
(1) Fiber cork.
(2) Synthetic rubber.
(3) Copper.
(4) Other soft metals.
What conditions are inspected on vibration dampeners?
Chips and cracks