Fuel Flashcards
What is fuel metering?
Is the adjustment of the fuel input based on the air intake
What are the standard mixture ratios?
Rich = 8:1
Lean = 16:1
What does the float device do?
Controls the level of fuel in the float bowl
__________ _________ _____________ is more useful for acrobatic fighter airplanes
______ _________ _________ is used to eliminate the drawbacks of carburetors
Fuel Injection System
Fuel ______/_____ provides provision for draining/sampling
Strainer/bowl
On the mixture control, how do you achieve full rich and full idle?
Full Rich-Push Forward on Knob
Idle Cutoff-Pull mixture control aft
As aircraft climbs, you heve to ______ mixture
Lean
_________ = Uncontrolled combustion, usually caused by using fuel with too low octane
Detonation
Hot spots cause ____ - ________
Pre-Ignition
__________: Ignition of fuel inside the induction system caused by very lean mixture burning
Backfire
___________ is caused by unburned fuel mixing with air in exhaust and reigniting, usually a sign of excessively rich mixture
Afterfire
The _____ _______ is known as a last chance fuel filter
Inlet Screen
_____ & ______ _______ opens and closes to allow or stop fuel into float bowl
Seat & Needle Valve
During Idle, sometimes the venturi effect isn’t strong enough, and relies on ______ _________. There are also holes upstream used to add fuel to the engine
Engine Suction
In automatic mixture control, ______ _________ reacts to atmospheric air pressure changes to drive the ________ ________
Sealed Bellows, Variable Orafice
__________ _______ is used during rapid engine acceleration, preventing mixture from leaning out as the venturi effect catches up
Accelerator pump
______ ________ _________ represrents the air pressure above the surface of the fuel required to prevent evaporation
Reid Vapour Pressure
To promote a fine spray pattern, a ________ _____ _______ is installed beside the main discharge nozzle and below the fuel level in the float bowl to break surface tension
Metered Air Bleed
Carburetor is limited to: _______ and ______ _____
Weather, Carb Ice
R Question: Where in the carb does the discharge nozzle sit?
In the thinnest point of the venturi
R Question: How do we shut the engine off?
Starve engine of fuel (Mixture to idle cutoff)
R Question: How do mags assist on startup?
Through the use of Impulse couplers
Low operating pressures can result in _________ __________ of fuel
incomplete vaporization
What type of pump do we use on the Continental Fuel Injection system?
Constant Displacement Vane Pump
T or F: A Pressure Injection Carb (Pressure Carb) doesn’t have a float bowl
True
Subsystems of Carburetor system:
Metering System
Mixture System: Automatic or Manual
Idle Valve
Accelerator Pump
Power Enrichment
_____ _______ __________ changes the throttle valve position at idle
Idle Speed Adjustment
______ ___________ ___________ changes the amount of fuel that enters the cylinders at idle
Idle Mixture Adjustment
When rigging engine controls, make sure that the control is at either extreme.
After installing the carb, there’s three independant control checks: _____ _____
- _______*
- __________*
Carb Heat
Mixture
Throttle
Checking for Bounce, Assembly/Installation, Orientation
What does the first number mean in 10W30?
Viscosity at low temperature
What does the last number mean in 10W30?
Viscosity at Operating Temperature
What does the ‘W’ mean in 10W30?
Winter grade
What if the ‘W’ is at the front?
Ashless Dispersent oil
