Engine Systems Parts Review
Engine systems Compression Fuel Governor Ignition fuel
Compression system
Compression System Parts: Block Piston Piston Rings Cylinder head The compression system includes all of the parts that create, contain and manage the engine compression. Parts: Block Piston Piston Rings Cylinder head Valves Valve Springs Connecting rod Crankshaft Gaskets Camshaft
Piston Rings Compression Wiper ring Oil ring Subject to to greatest amount of chemical corrosion & highest temp Transfers 70% of combustion heat from piston to cylinder walls. Wiper ring Meters oil film on cylinder walls Must be installed correctly. Oil ring Constructed of two thin rails with holes or slots cut in-between. Has the highest pressure against the cylinder wall of the three rings. Wiper Ring Oil Ring
Fuel System
Fuel System Fuel system parts: Supply (tank) Lines Shut off valves Filter Pump Carburetor The function of the fuel system includes: storing metering atomizing vaporizing mixing fuel and air delivering fuel air mixture to intake manifold Failure in any part of the system results in an engine that is hard to start and/or will not produce rated power.
Vaporization Vaporization is the process converting a liquid to a vapor. Fuel must be vaporized because liquid fuel will not burn. The rate and efficiency of vaporization is improved when the liquid is reduced to small droplets (atomized). Heat
Carburetor
Governor System
Governor system The function of the governor system is to maintain the desired engine speed regardless of engine load. The governor is attached to the throttle on the carburetor and supplies a force that attempts to close the throttle. The governor spring is attached to the governor linkage and applies a force that attempts to open the throttle. A constant engine speed means these two forces are balanced.
Governor parts
Ignition System
Ignition System The ignition system provides a high voltage spark in the combustion chamber at the proper time. Magneto Magneto systems must produce the current, transform the voltage and time the spark plug. Most small engines use the magneto system
Magneto Ignition System Parts Magnets Points (Breaker point only) Trigger coil Conductors Spark plug Condenser (Breaker point only) Lamination stack Primary winding Secondary winding