Final answer:
Parts found in an Otto engine but not in a diesel engine include spark plugs, carburetors or gasoline fuel injectors, and a throttle body. This is because diesel engines use compression ignition and have no need for spark-ignition components.
Step-by-step explanation:
The question pertains to the differences between Otto engines and diesel engines. Parts that you will find on an Otto engine, or a gasoline engine, but not on a diesel engine include:
- Spark plugs: Used in Otto engines for igniting the air-fuel mixture.
- Carburetor or Fuel Injectors (for a gasoline engine): In modern Otto engines, fuel injectors are more common, but older ones could use a carburetor to mix air and fuel.
- Throttle body: Controls the amount of air entering the engine in gasoline engines.
The Otto cycle consists of four strokes: intake, compression, power, and exhaust, which are different from the diesel cycle. Diesel engines use compression ignition rather than requiring a spark to ignite the fuel-air mixture, which is one of the main distinctions between these two types of engines. Therefore, a diesel engine does not contain spark plugs or a system designed for spark ignition.