Engines Flashcards
What are the four strokes to an Otto cycle?
Intake, compression, power, exhaust
What is the compression ratio?
It is the ratio between the total cylinder volume and the clearance volume
What is the four cylinder inline firing sequence?
1-3-4-2
What are the advantages and disadvantages of a Wankel engine?
Advantages:
- Compact
- Higher engine speed
- Higher power/weight ratio
- Balance
- Smoothness
Disadvantages:
- Higher heat transfer
- Sealing and leakage problems
What is a turbocharger?
It is a compressor -> A turbine that recovers energy from the exhaust and uses it to compress the air that enters the intake manifold
What is mechanical supercharging?
A seperate pump or blower (often electrically powered) to compress the air
What is pressure wave supercharging?
Use of wave actions in the intake and exhaust systems to compress the intake mixture.
What is a distributor used for?
A distributor houses all of the spark timing components that ensures that combustion in the cylinders of a multi-cylinder engine are properly sequenced.
What is a venturi?
A horizontal pipe has a narrowed section called a Venturi. At this section there is a narrow tube that is immersed in a reservoir containing fuel. Air is drawn through the tube as a consequence of low pressure created by the engine. The area of the tube at the narrow section is considerably smaller than that at the entrance to the tube.
How are engines classified?
- Application
- Basic geometry (reciprocating, rotary)
- Working cycle (four or two cycle)
- Valve/port location (overhead etc)
- Fuel type
- Fuel mixture (carburetion, injection directly into cylinders)
- Method of ignition (spark, compression)
- Combustion chamber design (open chamber design, divided)
- Method of load control (throttling of fuel and air)
- Method of cooling
