Piston 2 - Week 4C
What kind of fuel injection system is the Continental system?
An on demand high pressure system that provides fuel to the nozzles installed in the cylinder head spraying directly into the cylinder
An on demand low pressure system that provides fuel to the nozzles installed just outside the intake valve
A continuous flow low pressure system that provides fuel to the nozzles installed just outside the intake valve
A continuous flow high pressure system the provides fuel to the nozzles installed just outside the intake valve
Where does fuel vaporization take place in the Continental fuel injection system?
In the cold intake valve chamber
In the venturi housing
In the fuel metering unit
In the hot intake valve chamber
What kind of fuel pump does the Continental fuel injection system use?
A mixed displacement pump
A variable displacement pump
A constant variable displacement pump
A constant displacement pump
Where is the fuel sprayed in an Continental fuel injection system?
Into the intake valve chamber, just behind the valve
Into the combustion chamber, just between the spark plugs
Into the intake valve chamber, just in front of the valve
Into the exhaust valve chamber, just behind the valve
What is the advantage of using a variable displacement pump in a fuel injection system?
It allows control of fuel pressures at idle and mid range RPM
It allows control of fuel pressures at idle
It allows control of fuel pressures at idle and maximum RPM
It allows control of fuel pressure at maximum RPM
Why does fuel vaporization take place in the intake valve chamber in the Continental fuel injecton system?
Because the intake valve chamber is hot, so there is no possibility of fuel boiling
Because the intake valve chamber is cold, so there is no possibility of ice forming
Because the intake valve chamber is hot, so there is no possibility of ice forming
Because the intake valve chamber is cold, so there is no possibility of fuel vaporization
What is added to the fuel to improve vaporization in the Continental fuel injection system?
Air
Alcohol
Tetraethyl lead
Engine oil
What does the Continental fuel injection system use to determine the amount of fuel sent to the nozzles?
Air pressures and engine RPM
Air pressures
Engine RPM
Air pressures and fuel pressures
Which of the following is a part of the Continental fuel injection system? #3
The economizer pump
The fuel injector
The fuel manifold valve
The accelerator pump
Which of the following is a part of the Continental fuel injection system? #2
Fuel-air control unit
The accelerator pump
The float bowl
The fuel injector
Which of the following is a part of the Continental fuel injection system? #4
The fuel nozzle
The accelerator pump
The economizer pump
The needle valve
Which of the following is a part of the Continental fuel injection system? #1
The main discharge nozzle
The float assembly
The idle nozzles
The engine driven pump
What other function is sometimes included in the fuel pump of a Continental fuel injection system?
Mixture
Engine speed governing
Throttle
Mechanical supercharger compensation
Which of the following is a function of the fuel pump in the Continental fuel injection system? #2
It provides fuel flow that self adjusts with engine speed
It prevents any other pumps from providing fuel to the engine
It removes vapors from the fuel and returns them to the engine
It provides a constant fuel pressure to the fuel injection system under all normal conditions
Which of the following is a function of the fuel pump in the Continental fuel injection system? #1
It provides a constant fuel pressure to the fuel injection system under all normal conditions
It removes vapors from the fuel and returns them to the engine
It removes vapors from the fuel and returns them to the fuel tank
It prevents any other pumps from providing fuel to the engine
How is high un-metered fuel pressure controlled in a non-turbocharged Continental fuel injection pump?
With a low pressure relief valve
With a high pressure relief valve
With a variable orifice
With an aneroid controlled variable orifice
How is high un-metered fuel pressure controlled in a turbocharged Continental fuel injection pump?
With a high pressure relief valve
With a variable orifice
With an aneroid controlled variable orifice
With a low pressure relief valve
How many adjustments does the fuel pump in the Continental fuel injection system have?
2, low and high un-metered fuel pressure
2, mixture and throttle
2, low and high metered fuel pressure
1, mixture
What kind of pump is used in the Continental fuel injection system?
Gear
Diaphragm
Gerotor
Vane type
How is low un-metered fuel pressure controlled in a Continental fuel injection pump?
With a high pressure relief valve
With a low pressure relief valve
With a variable orifice
With a variable relief valve
Which of the following is a function of the fuel pump in the Continental fuel injection system? #3
It provides a constant fuel pressure to the fuel injection system under all normal conditions
It incorporates a bypass valve to allow fuel from other pumps to flow in the event of pump failure
It prevents any other pumps from providing fuel to the engine in the event of pump failure
It removes vapors from the fuel and returns them to the engine
In the Continental fuel injection system what is done to compensate for turbo lag?
The adjustable orifice will be moved by an aneroid to vary the fuel pressure to maintain the correct mixture
Nothing, turbo lag does not need to be compensated for
The adjustable orifice will be moved by a bourdon tube to vary the fuel pressure to maintain the correct mixture
The adjustable orifice will be moved by a centrufigal governer to vary the fuel pressure to maintain the correct mixture
In the Continental fuel injection system what is done with the "extra fuel" from the mixture valve when the mixture is leaned out?
It is returned back the the fuel tank
It is returned back the the fuel pump
It is sent to the cylinders
It is returned back the the fuel selector
In the Continental fuel injection system what will happen to the metering valve as the thottle opens?
It will open, increasing fuel flow
It will close, decreasing air flow
It will close, decreasing fuel flow
It will open, increasing air flow
What controls are typically contained inside the fuel portion of the fuel-air control unit in the Continental fuel injection system?
Mixture and idle valves
Mixture valve
Metering valve
Mixture and metering valves
What controls are typically contained inside the fuel portion of the fuel-air control unit in the Continental fuel injection system installed on the Piper Seminole?
Metering valve
Mixture and idle valves
Mixture and metering valves
Mixture valve
What parts are contained inside the air portion of the fuel-air control unit in the Continental fuel injection system?
Venturi, impact tubes
Butterfly valve, venturi, impact tubes
Butterfly valve, venturi
Butterfly valve
What is the purpose of the diaphragm in the fuel manifold valve of the Continental fuel injection system?
To turn the fuel on when idle cut-off is selected
To turn the fuel off when idle cut-off is selected
To adjust the air/fuel mixture as the aircraft climbs or decends
To turn the fuel on at full power
What is the fuel manifold valve also known as? #2
Mixture valve
Fuel distribution valve
Fuel metering valve
Idle valve
What is the fuel manifold valve also known as? #1
Idle valve
Fuel metering valve
Spider valve
Mixture valve
What are the purposes of the fuel manifold valve in the Continental fuel injection system?
To evenly distribute fuel and control the mixture ratio
To atomize the fuel and provide a positive fuel shut off during idle cut-off
To evenly distribute fuel and provide a positive fuel shut off during idle cut-off
To aid in consistent idling, evenly distribute fuel and provide a positive fuel shut off during idle cut-off
Why are the fuel nozzles in a turbocharged engine shrouded?
Because manifold pressure will be higher than ambient pressure, leading to fuel leaking out the bleed holes
Because manifold pressure will be higher than fuel pressure, leading to air leaking out the bleed holes
Because manifold pressure will be lower than ambient pressure, leading to fuel leaking out the bleed holes
Because manifold pressure will be higher than fuel pressure, leading to fuel leaking out the bleed holes
Why do unshrouded fuel injection nozzles include a screen in them?
To clean the fuel before it is used
To improve the atomization of the air by creating a turbulent flow
To improve the atomization of the fuel by creating a turbulent flow
To clean the air before it is used
What kind of engine would use a shrouded fuel injector?
A naturally aspirated horizontally opposed engine
A supercharged V-type engine
A turbocharged horizontally opposed engine
A supercharged radial engine
What kind of engine would use an unshrouded fuel injector?
A naturally aspirated horizontally opposed engine
A supercharged V-type engine
A supercharged radial engine
A turbocharged horizontally opposed engine
Why are there holes in the sides of fuel injection nozzles?
To allow more fuel in to maintain the correect air/fuel ratio
To allow air in to reduce the surface tension of the fuel casing better vaporization
To allow excess fuel out to maintain the correect air/fuel ratio
To allow fuel in to reduce the surface tension of the air casing better vaporization
What would you be looking for when inspecting fuel nozzles installed on the engine?
Damage and fuel stains
Fuel stains
Damage
Wear & fuel stains
What kind of service is normally performed on a fuel injection nozzle?
Cleaning and inspection
Cleaning, inspeciton, adjustment & reinstallation
Inspection and overhaul
Cleaning, adjustment & reinstallation
How are fuel nozzles dried after cleaning?
They are air dried, leaving them to sit overnight
They are towel dried
They are air dried, blowing shop air in the normal flow direction
They are air dried, blowing shop air in the reverse flow direction
Which of the following would NOT be applied to the threads of a fuel injection nozzle?
Copper anti-seize
Thread sealant
Lead anti-seize
Engine oil
Which of the seals in a turbocharged fuel injection nozzle would not be lubricated?
The cylinder head to nozzle seal
The o-rings
The upper deck to shroud seal
The rubber washer on top
Where are lubricants applied to the threads of a fuel injection nozzle? #1
To the threads at both ends of the nozzle and to the middle
Only to the threads that go to the fuel line
Only to the threads that go into the cylinder head
To the threads at both ends of the nozzle
How much lubricant would be applied to the threads of a fuel injection nozzle?
No lubricants are used
Lubricants are applied .040" thick
Lubricants are applied generously
Lubricants are applied sparingly
Where are lubricants applied to the threads of a fuel injection nozzle? #2
To all the threads that go into the cylinder head
To all the threads that go into the cylinder head except for the first 2 threads
To all the threads that go to the fuel line
To all the threads that go to the fuel line except for the first 2 threads
Once a fuel nozzle is dried, what would you do next?
Do the special nozzle inspection
Lubricate the threads
Install it before it gets lost of misplaced
Check it for obstruction
What must be done first after the fuel injection nozzles are installed?
Complete the annual
A log entry
Lubricate the threads
A leak test
What should you never do when removing fuel injection nozzles?
Mix them and their parts up between cylinders
MEK wash them
Rinse them after cleaning
Solvent wash them
How are fuel nozzles cleaned?
Using a special brush and detergents
Using a tooth brush and detergents
Using solvents in an ultrasonic cleaner
Using a piece of lockwire and Varsol
What should you always do do when removing fuel injection nozzles?
Lubricate them to prevent corrosion
Remove them using only the manufacturer specified special tool
Rotate the nozzles and their parts in the same manner as spark plugs are rotated
Keep each nozzle and its parts separate and identified by cylinder
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