Reciprocating Engine Induction Systems

The system of ducts that directs outside air to the carburetor.

The intake that forces air into the induction system.

Measures fuel based on air, mixing fuel and air.

Controls the air flow through the carburetor.

Air flow that influences engine power.

A system that measures air temperature near the carburetor.

Temperature of the fuel and air combined.

The system of ducts, carburetor, and throttle that intakes and controls fuel/air flow.

Ice formation in the engine's intake system, which can restrict airflow and cause engine failure.

Using heat to prevent ice formation in the carburetor.

Ice formation on the throttle plate due to low pressure. This ice reduces airflow to the engine.

Removal or prevention of dust and dirt from entering the engine intake system, vital for engine longevity and performance.

A condition in which the exhaust gases and unburnt fuel/air mixture are forced back into the engine's cylinder during the power stroke. Can damage the heater valve.

Ice forming from snow or ice particles entering and clogging the induction system or filter.

Ice formed when fuel vaporizes, cooling air inside the induction system, hindering airflow and causing engine to quit if not corrected.

A cockpit control used to regulate heat applied to the carburetor.

Dust particles can wear down engine components, contaminate oil, and disrupt fuel-air mixture, leading to reduced engine performance and lifespan.

Avoid using carburetor heat during ground operations to minimize backfire risks

The system that brings air into the engine, including air filters, ducts, and the carburetor.

Regular cleaning or replacement of foam air filters is crucial for maintaining optimal engine performance and preventing damage.

Dirty air filters restrict airflow, reducing engine power and efficiency. They also allow contaminants into the engine.

Remove the filter, clean it thoroughly, allow it to dry, and reapply oil. Avoid excessive squeezing or wringing.

Loose fasteners can be dangerous, potentially causing engine damage if they enter the engine.

The combination of fuel and air that is necessary for combustion in an engine. The correct ratio of fuel to air is crucial for engine performance.

The proportion of fuel to air in a fuel/air mixture, expressed as a ratio. This ratio directly affects engine performance.

Oxygen from the air is the key component that reacts with the fuel to produce heat energy during combustion.

Nitrogen is the largest component of air, but plays no active part in combustion. It primarily absorbs heat and expands, contributing to power production.

The correct weight ratio of fuel to air is vital because it affects engine performance, efficiency, and emissions.

Heat energy is produced during the combustion of the fuel/air mixture, which is essential for powering the engine.

The expansion of hot combustion byproducts (including nitrogen) drives the pistons, generating power for the engine.

The amount of air available for combustion decreases as altitude increases, which affects the fuel/air mixture and impacts engine performance.

The principle that the velocity of a fluid increases as it passes through a narrow portion (throat) causing the pressure to drop. This pressure drop is proportional to the airflow.

The narrow section within the carburetor that creates a pressure drop, allowing for fuel to be drawn into the air stream for combustion.

The carburetor is placed on the engine in a way that forces the air passing through the venturi towards the cylinders.

As air velocity increases through the venturi's throat, pressure drops proportionally. This lower pressure is used to draw fuel into the air stream for combustion.

The carburetor's placement ensures that air flows efficiently through the venturi and towards the engine cylinders, maximizing the fuel-air mixture for combustion.

The venturi, a narrowed section in a carburetor, uses the Venturi principle to draw fuel into the airstream. The venturi's size and shape depend on the engine's power requirements.

Updraft carburetors have air flow upwards, while downdraft carburetors have air flow downwards. This difference in airflow direction affects the design and positioning of the carburetor.

The throttle valve controls the amount of air flowing into the engine, regulating the power output by adjusting the air passing through the venturi.

Carburetors automatically adjust fuel delivery, maintaining a proper fuel/air ratio regardless of throttle opening, by leveraging the Venturi principle.

As the throttle is opened, airflow increases, causing a greater pressure drop in the venturi, therefore drawing more fuel into the airstream.

The float chamber in the carburetor holds fuel, maintaining the correct level by using a float-operated needle valve.

The discharge nozzle, where fuel is released into the air stream, is positioned in the venturi's throat, where the lowest pressure occurs.

The fuel in the carburetor is pushed out of the discharge nozzle due to the lower pressure at the nozzle as compared to the atmospheric pressure in the float chamber.

When the throttle is opened wider, the airflow increases, leading to a greater pressure drop in the venturi, which in turn causes more fuel to be discharged.

The metering jet regulates the amount of fuel flowing to the discharge nozzle, influencing the richness or leanness of the fuel/air mixture.

A larger metering jet allows more fuel to flow, resulting in a richer (more fuel-heavy) air/fuel mixture.

A smaller metering jet restricts fuel flow, resulting in a leaner (more air-heavy) air/fuel mixture.

To ensure proper operation at different engine speeds and loads, carburetors have multiple systems that regulate fuel/air mixture.

Proper fuel/air mixture is vital for engine performance and efficiency. It's the combination of fuel and air that burns to create power.