Test #2 Study Flashcards
The “Veins” of the bike is and does what?
Delivers fuel from the pump to the fuel rail or injector.
Describe the “Y” theory.
Every atomizing circuit has three openings.
The “Muscle” of the bike is and does what?
Injectors - sprays high pressure fuel ensuring excellent atomization at all intake speeds.
What makes the slide rise in a CV carburetor?
Pressure Differences
Three current basic injection duration methods:
A.) D-Jetronic (D-J)
B.) Alpha-N
C.) L-Jetronic (L-J)
Throttle linkage is used to activate what auxiliary circuit?
Accelerator Pump
What are the three purposes of the carburetor?
A.) Controls air volume supplied to the cylinder.
B.) Controls fuels supplies to the air.
C.) Varies AFR to sut engine requirements.
Tow major parts of the float valve:
A.) Seat
B.) Needle
What three type of needle jets on a mechanical slide carburetor?
A.)Primary Type
B.) Bleed Type
c.) Primary/Bleed Type
What are the three primary EFI sensor?
A.) IAP or MAP
B.) TPS or APS
C.) CKP or CPS
Explain a “closed loop system”:
System that gets feedback from the exhaust and adjusts accordingly/
Major Reasons for EFI:
A.)AFR is not reliant on jet sizes and air pressure differences.
b.) AFR can be controlled and changed based on a computer ontrolled fuel map.
C.) Increased emissions.
D.) Less problems from emissions with quick throttle change.
E.) Allows the use of multiple system interactions.
The holes drilled in the fuel tube are?
Air Bleeds
What’s the purpose of a slide cutaway on a mechanical slide carburetor?
Funneling effect assists with the transition from transer to needle circuit.
What controls the transer ports?
Throttle Plate
Describe Venturi Principle:
More speed = Less pressure
When was fuel injection originally designed?
1902
Purpose of the power jet:
Fuel amounts are regulated to create optimum combustion temperates and acceleration rate.
Is a restriction used to meter fuel or air flow.
Jet
Two ways power jets are controlled:
Pressure Jets
Electronically
What are the two other names for the idle circuit?
A.) Slow
B.) Pilot
Name the three auxiliary circuits found on carburetors:
A.) Accelerator Pump
B.)Power Jet
C.) Air Cut Valve
The “Body” of the bike is and does what?
Throttle Body - throttle plates, also known as butterflies, control air velocity and volume.
The mechanical slide carburetor has how many tuneable circuits?
4
What controls the airflow in a mechanical slide carburetor?
Slide Throttle
The “Heart” of the bike is, and does what?
Fuel Pump - Supplies high pressure to the fuel lines.
Name & Desribe the two engine cold start systems.
A.) Choke - A choke plate closes to create a large pressure difference at the fuel tubes causing all tubes to discharge fuel.
B.) Enrichener - a subsystem which acts like a mini carburetor to richen fuel.
Sensor input data is split in to what categories?
A.)Primary
B.) Secondary
Purpose of the air cut valve:
Prevents lean misfires on deceleration.
Sensor signals are split in to what three categories?
A.) 5 Volt
B.) Inductive
C.) Electrochemical
Name the three carburetor mounting styles.
A.)Flange
B.) Spigot
C.) Clamp-on
What are the three basic carburetor circuits?
A.) Idle Circuit
B.) Midrange Circuit
C.) Main Circuit
Four benefits of the CV carburetor:
A.) Fuel Efficient
B.) AFR is delivered proportionally to engine RPM
C.) Lower Emissions
D.) Compensate somewhat for altitude.
What controls the operation of the air cut valve?
Engine Vacuum
What restricts/allows air flow to the engine?
Throttle
When did the 1st/2nd generation EFI systems emerge on motorcycles?
1st - early 90’s
2nd - Late 90’s
The butterfly throttle controls what in the fixed venturi carburetor?
Airflow
The “brain” of the bike is and does what?
ECU - controls fuel delivery and ignition timing.
Purpose of the slide lift hole:
Allows low pressure to get to the top of the slide.
Alpha-N and D-Jetronic (DJ) are used for what, in motorsport applications?
Basic injection duration
What does the ECU activate?
A.) Injectors
B.) Spark Plugs/Coils
C.) ETV (Electronic Throttle Valve)
D.) Idle Speed Control
E.) Instrument cluster RPM, speed, warning lights, etc,
Purpose of the accelerator pump:
Prevents a lean condition on acceleration.
