Compression Systems
What is the function of the compression system in a 4 cycle engine?
It compresses air to increase potential energy resulting from fuel combustion.
What is the main function of the fuel system in a 4 cycle engine?
To provide fuel for internal combustion energy.
What is the primary function of the ignition system in a 4 cycle engine?
To provide electrical energy required for ignition and other devices like lights.
What is the main purpose of the lubrication system in a 4 cycle engine?
To keep internal engine parts coated with oil to reduce friction and enhance cooling.
What is the function of the air intake system in a 4 cycle engine?
To provide a source of clean air necessary for the combustion of the air/fuel mixture.
What are the names of the rings on the piston and their functions?
The top ring is the compression ring, which seals the chamber; the middle ring is the scraper ring, which coats the chamber in oil; and the lower ring is the oil ring, which controls oil on the cylinder walls.
What part of the carburetor controls the flow of fuel into the combustion chamber?
The float and needle control the amount of fuel in the combustion chamber.
What role does the flywheel play in the ignition system?
The flywheel helps to maintain engine speed and provide electrical energy for ignition,
What does the oil filter do in the lubrication system?
The oil filter removes debris like metal shavings or dirt from the oil as it circulates throughout the engine.
What does the air filter do in the air intake system?
The air filter removes debris from the air as it enters the engine, ensuring clean air for combustion.
What connects the piston to the crankshaft?
The connecting rod connects the piston to the crankshaft.
What is the function of the pilot jet in the carburetor?
The pilot jet controls the amount of fuel when the engine is idle.
What is the purpose of the valve tappets in the ignition system?
Valve tappets open and close the valves, being moved by the rotation of the camshaft.
Explain the function of the crankcase sump.
The crankcase sump stores some oil and distributes it to the internal parts of the engine.
Describe the purpose of the muffler in the exhaust system.
The muffler reduces engine noise and minimizes sparks in the exhaust gases.
Describe the role of the valve assembly in the compression system.
The valve assembly works with the piston to perform compression for combustion by opening and closing for air/fuel mixture entry and exhaust waste release.
Describe the role of the emulsion tube in the carburetor system.
The emulsion tube maintains air to fuel ratios at all speeds of operation, ensuring that fuel is mixed properly before entering the combustion chamber.
How does the camshaft affect the operation of the ignition system?
The camshaft times the opening and closing of the valves in relation to the position of the piston.
What is the role of the oil slinger in the lubrication system?
The oil slinger splashes oil inside the crankcase to coat internal parts, and in some engines, it acts as a governor to maintain engine speed.
How does the blower housing contribute to engine cooling?
The blower housing encompasses a cooling fan that directs air to the cylinder block and head, helping to cool components during combustion.
Explain the purpose of the piston pin and piston pin lock.
The piston pin connects the piston to the connecting rod, while the piston pin lock holds the piston pin in place.
How does the main jet function when the throttle is open?
The main jet controls the amount of fuel when the throttle is open, usually at 50-100% power.
Describe how the ignition system contributes to the engine's overall performance.
The ignition system ensures that the air/fuel mixture ignites at the correct time for optimal combustion, improving engine efficiency and power output.
How does the dipstick assist in maintaining the lubrication system?
The dipstick is used to check the amount of oil in the engine, ensuring proper oil levels for effective lubrication.
What is the function of the breather tube assembly in the air intake and exhaust system?
The breather tube assembly directs clean air into the combustion chamber, supporting the combustion process.