engine tech

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Carburetor

A device for automatically mixing fuel in a proper proportion with air to produce a combustible gas.

Acceleration Well

A reservoir of fuel, located inside the nozzle, for use during rapid acceleration.

Lower

Since blade tip speed is a function of blade length and engine rpm, longer blades require ____________ engine speeds.

Venturi

What is a restriction in a passage, which causes incoming air to increase in velocity called?

To maintain a constant level of fuel in the float bowl

What is the purpose of the carburetor float?

They should be discarded and replaced with a new filter

What should be done to dry type air filter elements when they become dirty?

Centrifugal (mechanical)

What type of governor utilizes pivoting flyweights?

Updraft

Which type of carburetor would normally require a smaller air passage than the other two types?

Load Adjustment

A needle that regulates the amount of fuel entering the main nozzle.

Fuel & Air

11. A carburetor's primary function in to mix proper proportions of _________________________ to operate the engine.

diaphragm

A flexible partition or wall separating two cavities.

Primer

A hand operated plunger, which, when depressed, forces additional fuel through the main nozzle prior to starting a cold engine.

Natural Draft

A type of carburetor that has the air flowing horizontally into the manifold.

Downdraft

A type of carburetor that is placed high on the engine, and has the air flowing downward into the manifold.

Updraft

A type of carburetor that is placed low on the engine, and has the air flowing upward into the manifold.

Manual

A type of throttle control that consists of mechanical linkage or a flexible cable, which is used to open and close the throttle valve.

Governor

A type of throttle control that uses a mechanical, hydraulic, or electrical device that controls and regulates speed.

choke

A valve that is placed in a carburetor air inlet to restrict the volume of air admitted.

Vacuum

A(n) _______________ type of governor is usually used on farm and industrial engines.

Oil Wetted

A(n) ___________________ type of air cleaner element can be used again by washing it in soapy water.

Vent

A(n) ________________________ in the float bowl is used to equalize the air pressure above the fuel in the float bowl and the air pressure entering the carburetor.

Updraft

Air velocity must be highest in the _______________ carburetor.

Absolute Vacuum

An ____________________ is any area completely free of air or atmospheric pressure.

Vacuum

Any pressure less than atmospheric pressure.

needle valve

As fuel is used from the float bowl, the float lowers and unseats a(n) __________________ which lets fuel enter the bowl.

atmospheric pressure

As soon as the intake valve opens or the intake port is uncovered in a gas engine, _________________ forces air through the carburetor and manifold to fill that vacuum.

richer

As the air filter fills with dirt, the air-fuel mixture will become

Hunting

Centrifugal governor ______________ is when the engine speeds up and slows down repeatedly under a constant load condition.

Manifold vacuum

Diaphragm carburetors are operated by ____________________________.

Inoperative

During idle and fast idle conditions, the main discharge nozzle is __________________________.

25

For average applications such as normal yard lawn mowing, the air cleaner should be cleaned every __________ hours per season.

Vaporized

Gasoline must be ________________ by the carburetor.

Every time the engine is serviced or repaired

How often should an engine air cleaner be examined?

Spring

If an engine is designed to run at a constant speed, the speed is adjusted with the governor ___________.

Upstroke

In a diaphragm type carburetor on two-cycle engines, the fuel is drawn into the crankcase during the upstroke or downstroke of the piston?

Greatest

In a venturi, air pressure is greatest where velocity is ____________________.

Idle Discharge

In diaphragm carburetor operation, during intermediate speeds, fuel flows from the _______________________ ports only.

Air Vane Centrifugal Vacuum

List the three types of governors discussed in the chapter.

Neoprene Brass

Needle valve points in the carburetor float chamber are usually made from one of two materials. The two materials are what?

15 to 1

Normal air-fuel mixture by weight is what ratio?

Open the throttle valve

On a governor installation, the governor spring is attached to the throttle lever. The governor spring is intended to do what?

Spring tension

On an air vane governor, controlling speed is accomplished by balancing air pressure with ________________.

The float level

On some carburetors, the amount of fuel that enters the main discharge nozzle is regulated by ___________________.

Starting of the engine

Richest air-fuel mixture takes place during _________________.

Downdraft

The ____________________ carburetor can provide larger volumes of fuel for high speed and power requirements.

Acceleration Well

The ____________________________ stores fuel for use during rapid acceleration.

Stability

The ability of a governor to maintain a preset speed without fluctuating is called __________________.

Stability

The ability to maintain a desired engine speed without fluctuating.

Idling

The acceleration well fills when the engine is _____________________.

pleated

The air filter that is similar to air filters used in modern automobiles is the ______ paper type.

Flywheel

The air vane governor is operated by the stream of air created by the ____________ cooling fins.

Choke

The carburetor ________________ is a round disc mounted on a shaft located at the intake end of the carburetor.

Nearest the intake end of the carburetor

The choke valve in the carburetor is always located where?

Main discharge Nozzle

The diaphragm in a carburetor forces fuel through the ____________________________.

Part throttle

The economizer circuit is design to retard fuel flow to the engine at ____________________.

Flat pleated paper cartridge filter

The newest type of air cleaner for small gasoline engines is the ______________.

Sensitivity

The percent of engine speed change required to produce a corrective movement of the fuel control mechanism is called ______________.

Sensitivity

The percent of speed change required to produce a corrective movement of the fuel control mechanism.

Increase the air-fuel ratio

The primary purpose of air bleeds is to _______________________.

Air Pressure

The primer on a float-type carburetor pumps ___________________ into the float bowl forcing fuel up the nozzle.

Shaking it with the external side down

The proper way to clean an air filter cartridge of the pleated paper type is what?

Detergent & Water

The safest solution in which to wash an air cleaner plastic foam element is what?

15

The usual normal air-fuel mixture is a ratio of ____________ part(s) of air to 1 part of fuel.

Throttle

This controls speed by regulating the amount of fuel delivered to the engine.

Air Cleaner

This is a device that is used to clean incoming air.

Venturi

This is a restriction in a passage, which causes air to move with an increased velocity.

Float

This is a small, sealed vessel made of brass or plastic.

Economizer Circuit

This is designed to retard fuel flow to the engine at part throttle.

Atmospheric Pressure

This is the weight of air at sea level.

Oil Wetted Dry types Dual-element

What are the three types of air cleaners that are widely used in small gasoline engines?

Maintain Speed Prevent Over-speeding Limit high & low speeds

What are three basic functions that governors are designed to serve?

Dual-element

When an engine is designed for use in greater than normal dusty/dirty conditions, a(n) ________________ air filter is installed.

Richer

When closed, does the choke provide a leaner or richer air-fuel mixture, which is needed to start a cold engine?

Use more fuel Lose power Accumulate carbon

When the air filter becomes dirty, the engine will do what?

Dry type

__________________ air cleaners pass the airstream through treated paper, felt, fiber, or flocked screen.


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