Fuel Injection System Flashcards
How does the fuel injection system work?
Measures the volume of air flowing into the engine to determine the amount of fuel -uses RPM
What are the 4 basic components to the fuel injection system?
Engine Driven Injector Pump (Usually Vane type)
Fuel/Air Control Unit
Fuel Manifold Valve
Injector Nozzles
Boost Pump (For startup, and as an aux pump)
In a turbocharged fuel injection system, what is different?
No manually adjusted variable orafice
there is an Aneroid assembly exposed to the upper deck
T or F: In the Fuel Air Control Unit, there is a venturi
False
What is the advantage of a fuel injection system over a carb and pressure carb?
Even distribution and continuos flow of metered fuel
Positive shutoff during idle cutoff
What type of injector nozzle has a filter screen and a steel shroud?
Normally Aspirated Nozzle
Where does fuel and air mix?
Inlet of the Intake Valve Port
What will an absolute pressure gauge read at sea level?
14.7 psi
What will gauge pressure be at sea level?
0 psi
WHAT IS THE 4 STROKE PRINCIPLE?
INTAKE, COMPRESSION, POWER, EXHAUST
DURING A COMPRESSION TEST, WHAT CONDITION AND POSITION SHOULD THE ENGINE BE IN?
Oil warm for sealing TDC compression
HOW DO THE SHOWER OF SPARKS OPERATE AND TURN OFF?
START SWITCH GROUNDS NORMAL BREAKERS AND ACTIVATES RETARD BREAKERS FOR STARTING (TO DELAY KICKBACK)
DURING A COMPRESS. TEST, IF THERE’S HISSING IN THE BREATHER TUBE / CRANKCASE VENT, WHERE IS THE LEAK LIKELY?
PISTON RINGS, PISTON, COULD ALSO BE COLD OIL
DURING A COMPRESS. TEST, IF THERE’S HISSING IN THE EXHAUST, WHERE IS LIKELY THE LEAK?
VALVE (HYD LIFTERS USE OIL FOR ZERO CLEARANCE ON VALVE TIP AT OPERATING TEMP), VALVE SEAT
WHAT CONNECTS THE PISTON TO THE CRANKSHAFT
CONNECTING ROD (CONVERTS LINEAR MOTION TO ROTARY)
WHAT IS THE MOST COMMON OIL PUMP?
CONSTANT DISPLACEMENT GEAR PUMP
WHAT IS A METHOD OF REDUCING VISCOSITY UPON SHUTDOWN TO ALLOW FOR EASIER STARTS IN COLD WEATHER CONDITIONS?
OIL DILUTION
WHICH IS HIGHER VISCOSITY? SAE50 OR SAE100?
SAE100
WHAT DOES THE BOLDED PART MEAN?
W20W50
ASHLESS DISPERSENT ADDITIVE
WHAT DOES THE BOLDED PART MEAN?
W20W50
20 VISCOSITY FOR LOW TEMPERATURE OPERATIONS
WHAT DOES THE BOLDED PART MEAN?
W20W50
WINTER GRADE
W20W50
VISCOSITY AT HIGH TEMPERATURE OPERATIONS/OPERATING TEMP
WHAT DOES A VERNOTHERM DO?
PREVENTS OIL FROM ENTERING THE OIL COOLER ON STARTUP, UNTIL OIL HEATS UP
WHAT DOES A BACK SUCTION MIXTURE CONTROL DO?
CHANGES AMOUNT OF FUEL BASED ON AIR DENSITY
SEALED BELLOWS REACTS TO ARMOSPHERIC AIR PRESSURE CHANGES TO DRIVE THE VARIABLE ORAFICE
RICHENS AT LOW ALTITUDE
LEANS AT HIGHER ALTITUDE
WHERE IS THE MAIN DISCHARGE NOZZLE IN A CARBURETOR?
IN THE THINNEST POINT OF THE VENTURI
WHAT CONTROLS THE MIXTURE OF THE FUEL AT IDLE?
IDLE MIXTURE SCREW/IDLE CIRCUIT
TO CHECK IDLE MIXTURE, WHAT SHOULD YOU LOOK FOR?
AN INCREASE IN 25-50 RPM DURING IDLE CUTOFF (CORRECT STOICHIOMETRIC RATIO)
WHAT CONTROLS FUEL FLOW IN FRONT OF THE FLOAT BOWL?
FLOAT AND NEEDLE SEAT
IF THE NEEDLE DOES NOT SEAT, WHAT WILL HAPPEN?
OVER-RICH MIXTURE
WHERE IS THE MAIN DISCHARGE NOZZLE LOCATED ON A PRESSURE CARBURETOR?
DOWNSTREAM OF THE VENTURI TO PREVENT CARB ICING
WHAT KIND OF SYSTEM IS THE CONTINENTAL FUEL INJECTION SYSTEM?
CONTINUOUS FLOW VIA FUEL METERING UNIT
USES A ROTARY VANE PUMP
ON THE CONTINENTAL SYSTEM, HOW IS FUEL USED FOR STARTING?
BOOST PUMP BYPASSES EDP ON STARTUP OVERCOMES SPRING PRESSURE THAT IS ON VALVE, SENDS FUEL TO EACH DISCHARGE NOZZLE EQUALLY
