Submit Search
Upload
carburated].pdf
•
0 likes
•
5 views
B
BELAJARBERSAMAPAKEKO
Follow
Carburated componen
Read less
Read more
Automotive
Report
Share
Report
Share
1 of 53
Download now
Download to read offline
Recommended
CHAPTER 2.PPT
CHAPTER 2.PPT
Jemilsultan1
CHAPTER 2.ppt
CHAPTER 2.ppt
Jemilsultan1
Exahust system.PPT
Exahust system.PPT
Jemilsultan1
Carburettor ppt
Carburettor ppt
Sudhakar Uppalapati
Internal Combustion Engine [Gasoline/Petrol] presentation
Internal Combustion Engine [Gasoline/Petrol] presentation
Hamood Ur Rahman
chapter 4.PPT
chapter 4.PPT
Jemilsultan1
Fuel system.PPT
Fuel system.PPT
Jemilsultan1
Engine 4G15
Engine 4G15
Larrie Hil
Recommended
CHAPTER 2.PPT
CHAPTER 2.PPT
Jemilsultan1
CHAPTER 2.ppt
CHAPTER 2.ppt
Jemilsultan1
Exahust system.PPT
Exahust system.PPT
Jemilsultan1
Carburettor ppt
Carburettor ppt
Sudhakar Uppalapati
Internal Combustion Engine [Gasoline/Petrol] presentation
Internal Combustion Engine [Gasoline/Petrol] presentation
Hamood Ur Rahman
chapter 4.PPT
chapter 4.PPT
Jemilsultan1
Fuel system.PPT
Fuel system.PPT
Jemilsultan1
Engine 4G15
Engine 4G15
Larrie Hil
CHAPTER 26 diessel injection.PPT
CHAPTER 26 diessel injection.PPT
Jemilsultan1
Analysis and enhancement of internal combustion engines
Analysis and enhancement of internal combustion engines
Kealeboga Mogapi
introduction to carburetor
introduction to carburetor
DhruvKumar131
CHAPTER 39_cooling7.PPT
CHAPTER 39_cooling7.PPT
Jemilsultan1
Fuel Systems of Aircrafts
Fuel Systems of Aircrafts
alpha_sherdil
Chapter 03 cmsm
Chapter 03 cmsm
Betterwrench
The New UE Compression
The New UE Compression
JoLynn Andrews
Automobile unit 2 carburetor
Automobile unit 2 carburetor
AninVincelyD
Automobile Engineering Unit 2 - Anna university
Automobile Engineering Unit 2 - Anna university
suresh n
Diesel engine
Diesel engine
Krishna Gali
Introduction to the diesel engine
Introduction to the diesel engine
amged radhi
Diesel engine basics
Diesel engine basics
PavanKumarKallakuri
Diesel engine
Diesel engine
Krishna Gali
cat presentation final.pptx
cat presentation final.pptx
SAVANTPANWAR
Diesel Power Plant
Diesel Power Plant
Power System Operation
Variable valve timing in internal combustion engine
Variable valve timing in internal combustion engine
risnathani
Turbocharging of the Piston Engine.pdf
Turbocharging of the Piston Engine.pdf
The University of Lahore
Diesel Power Plant
Diesel Power Plant
dishantpati
Overview Diesel Engine Operation
Overview Diesel Engine Operation
Eko Kiswanto
Diesel power plant
Diesel power plant
Nishkam Dhiman
Vip Mumbai Call Girls Mumbai Call On 9920725232 With Body to body massage wit...
Vip Mumbai Call Girls Mumbai Call On 9920725232 With Body to body massage wit...
amitlee9823
Delhi Call Girls Saket 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
Delhi Call Girls Saket 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
shivangimorya083
More Related Content
Similar to carburated].pdf
CHAPTER 26 diessel injection.PPT
CHAPTER 26 diessel injection.PPT
Jemilsultan1
Analysis and enhancement of internal combustion engines
Analysis and enhancement of internal combustion engines
Kealeboga Mogapi
introduction to carburetor
introduction to carburetor
DhruvKumar131
CHAPTER 39_cooling7.PPT
CHAPTER 39_cooling7.PPT
Jemilsultan1
Fuel Systems of Aircrafts
Fuel Systems of Aircrafts
alpha_sherdil
Chapter 03 cmsm
Chapter 03 cmsm
Betterwrench
The New UE Compression
The New UE Compression
JoLynn Andrews
Automobile unit 2 carburetor
Automobile unit 2 carburetor
AninVincelyD
Automobile Engineering Unit 2 - Anna university
Automobile Engineering Unit 2 - Anna university
suresh n
Diesel engine
Diesel engine
Krishna Gali
Introduction to the diesel engine
Introduction to the diesel engine
amged radhi
Diesel engine basics
Diesel engine basics
PavanKumarKallakuri
Diesel engine
Diesel engine
Krishna Gali
cat presentation final.pptx
cat presentation final.pptx
SAVANTPANWAR
Diesel Power Plant
Diesel Power Plant
Power System Operation
Variable valve timing in internal combustion engine
Variable valve timing in internal combustion engine
risnathani
Turbocharging of the Piston Engine.pdf
Turbocharging of the Piston Engine.pdf
The University of Lahore
Diesel Power Plant
Diesel Power Plant
dishantpati
Overview Diesel Engine Operation
Overview Diesel Engine Operation
Eko Kiswanto
Diesel power plant
Diesel power plant
Nishkam Dhiman
Similar to carburated].pdf
(20)
CHAPTER 26 diessel injection.PPT
CHAPTER 26 diessel injection.PPT
Analysis and enhancement of internal combustion engines
Analysis and enhancement of internal combustion engines
introduction to carburetor
introduction to carburetor
CHAPTER 39_cooling7.PPT
CHAPTER 39_cooling7.PPT
Fuel Systems of Aircrafts
Fuel Systems of Aircrafts
Chapter 03 cmsm
Chapter 03 cmsm
The New UE Compression
The New UE Compression
Automobile unit 2 carburetor
Automobile unit 2 carburetor
Automobile Engineering Unit 2 - Anna university
Automobile Engineering Unit 2 - Anna university
Diesel engine
Diesel engine
Introduction to the diesel engine
Introduction to the diesel engine
Diesel engine basics
Diesel engine basics
Diesel engine
Diesel engine
cat presentation final.pptx
cat presentation final.pptx
Diesel Power Plant
Diesel Power Plant
Variable valve timing in internal combustion engine
Variable valve timing in internal combustion engine
Turbocharging of the Piston Engine.pdf
Turbocharging of the Piston Engine.pdf
Diesel Power Plant
Diesel Power Plant
Overview Diesel Engine Operation
Overview Diesel Engine Operation
Diesel power plant
Diesel power plant
Recently uploaded
Vip Mumbai Call Girls Mumbai Call On 9920725232 With Body to body massage wit...
Vip Mumbai Call Girls Mumbai Call On 9920725232 With Body to body massage wit...
amitlee9823
Delhi Call Girls Saket 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
Delhi Call Girls Saket 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
shivangimorya083
9990611130 Find & Book Russian Call Girls In Vijay Nagar
9990611130 Find & Book Russian Call Girls In Vijay Nagar
GenuineGirls
Call Now ≽ 9953056974 ≼🔝 Call Girls In Shankar vihar ≼🔝 Delhi door step delev...
Call Now ≽ 9953056974 ≼🔝 Call Girls In Shankar vihar ≼🔝 Delhi door step delev...
9953056974 Low Rate Call Girls In Saket, Delhi NCR
John deere 425 445 455 Maitenance Manual
John deere 425 445 455 Maitenance Manual
Excavator
Bangalore Call Girls: 🍓 7737669865 🍓 High Profile Model Escorts | Bangalore E...
Bangalore Call Girls: 🍓 7737669865 🍓 High Profile Model Escorts | Bangalore E...
amitlee9823
Call Girls In Kotla Mubarakpur Delhi ❤️8448577510 ⊹Best Escorts Service In 24...
Call Girls In Kotla Mubarakpur Delhi ❤️8448577510 ⊹Best Escorts Service In 24...
lizamodels9
Call Girls in Malviya Nagar Delhi 💯 Call Us 🔝9205541914 🔝( Delhi) Escorts Ser...
Call Girls in Malviya Nagar Delhi 💯 Call Us 🔝9205541914 🔝( Delhi) Escorts Ser...
Delhi Call girls
What Causes BMW Chassis Stabilization Malfunction Warning To Appear
What Causes BMW Chassis Stabilization Malfunction Warning To Appear
JCL Automotive
(INDIRA) Call Girl Surat Call Now 8250077686 Surat Escorts 24x7
(INDIRA) Call Girl Surat Call Now 8250077686 Surat Escorts 24x7
Call Girls in Nagpur High Profile Call Girls
Stay Cool and Compliant: Know Your Window Tint Laws Before You Tint
Stay Cool and Compliant: Know Your Window Tint Laws Before You Tint
Bisnar Chase Personal Injury Attorneys
Vip Hot Call Girls 🫤 Mahipalpur ➡️ 9711199171 ➡️ Delhi 🫦 Whatsapp Number
Vip Hot Call Girls 🫤 Mahipalpur ➡️ 9711199171 ➡️ Delhi 🫦 Whatsapp Number
kumarajju5765
Greenery-Palette Pitch Deck by Slidesgo.pptx
Greenery-Palette Pitch Deck by Slidesgo.pptx
zohiiimughal286
Vip Mumbai Call Girls Mira Road Call On 9920725232 With Body to body massage ...
Vip Mumbai Call Girls Mira Road Call On 9920725232 With Body to body massage ...
amitlee9823
Why Won't Your Subaru Key Come Out Of The Ignition Find Out Here!
Why Won't Your Subaru Key Come Out Of The Ignition Find Out Here!
AutoScandia
Tata_Nexon_brochure tata nexon brochure tata
Tata_Nexon_brochure tata nexon brochure tata
aritradey27234
What Could Cause Your Subaru's Touch Screen To Stop Working
What Could Cause Your Subaru's Touch Screen To Stop Working
Bruce Cox Imports
How To Fix Mercedes Benz Anti-Theft Protection Activation Issue
How To Fix Mercedes Benz Anti-Theft Protection Activation Issue
Terry Sayther Automotive
一比一原版(PU学位证书)普渡大学毕业证学历认证加急办理
一比一原版(PU学位证书)普渡大学毕业证学历认证加急办理
ezgenuh
Delhi Call Girls Vikaspuri 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
Delhi Call Girls Vikaspuri 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
shivangimorya083
Recently uploaded
(20)
Vip Mumbai Call Girls Mumbai Call On 9920725232 With Body to body massage wit...
Vip Mumbai Call Girls Mumbai Call On 9920725232 With Body to body massage wit...
Delhi Call Girls Saket 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
Delhi Call Girls Saket 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
9990611130 Find & Book Russian Call Girls In Vijay Nagar
9990611130 Find & Book Russian Call Girls In Vijay Nagar
Call Now ≽ 9953056974 ≼🔝 Call Girls In Shankar vihar ≼🔝 Delhi door step delev...
Call Now ≽ 9953056974 ≼🔝 Call Girls In Shankar vihar ≼🔝 Delhi door step delev...
John deere 425 445 455 Maitenance Manual
John deere 425 445 455 Maitenance Manual
Bangalore Call Girls: 🍓 7737669865 🍓 High Profile Model Escorts | Bangalore E...
Bangalore Call Girls: 🍓 7737669865 🍓 High Profile Model Escorts | Bangalore E...
Call Girls In Kotla Mubarakpur Delhi ❤️8448577510 ⊹Best Escorts Service In 24...
Call Girls In Kotla Mubarakpur Delhi ❤️8448577510 ⊹Best Escorts Service In 24...
Call Girls in Malviya Nagar Delhi 💯 Call Us 🔝9205541914 🔝( Delhi) Escorts Ser...
Call Girls in Malviya Nagar Delhi 💯 Call Us 🔝9205541914 🔝( Delhi) Escorts Ser...
What Causes BMW Chassis Stabilization Malfunction Warning To Appear
What Causes BMW Chassis Stabilization Malfunction Warning To Appear
(INDIRA) Call Girl Surat Call Now 8250077686 Surat Escorts 24x7
(INDIRA) Call Girl Surat Call Now 8250077686 Surat Escorts 24x7
Stay Cool and Compliant: Know Your Window Tint Laws Before You Tint
Stay Cool and Compliant: Know Your Window Tint Laws Before You Tint
Vip Hot Call Girls 🫤 Mahipalpur ➡️ 9711199171 ➡️ Delhi 🫦 Whatsapp Number
Vip Hot Call Girls 🫤 Mahipalpur ➡️ 9711199171 ➡️ Delhi 🫦 Whatsapp Number
Greenery-Palette Pitch Deck by Slidesgo.pptx
Greenery-Palette Pitch Deck by Slidesgo.pptx
Vip Mumbai Call Girls Mira Road Call On 9920725232 With Body to body massage ...
Vip Mumbai Call Girls Mira Road Call On 9920725232 With Body to body massage ...
Why Won't Your Subaru Key Come Out Of The Ignition Find Out Here!
Why Won't Your Subaru Key Come Out Of The Ignition Find Out Here!
Tata_Nexon_brochure tata nexon brochure tata
Tata_Nexon_brochure tata nexon brochure tata
What Could Cause Your Subaru's Touch Screen To Stop Working
What Could Cause Your Subaru's Touch Screen To Stop Working
How To Fix Mercedes Benz Anti-Theft Protection Activation Issue
How To Fix Mercedes Benz Anti-Theft Protection Activation Issue
一比一原版(PU学位证书)普渡大学毕业证学历认证加急办理
一比一原版(PU学位证书)普渡大学毕业证学历认证加急办理
Delhi Call Girls Vikaspuri 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
Delhi Call Girls Vikaspuri 9711199171 ☎✔👌✔ Whatsapp Hard And Sexy Vip Call
carburated].pdf
1.
2.
C H A
P T E R 9 Carburetion
3.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • List and explain the principles of carburetion. • Distinguish between natural draft, updraft, and downdraft carburetors. • Explain float-type carburetor operation. • Explain the operation of diaphragm-type carburetors. • Explain vacuum carburetor operation. Learning Objectives
4.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Differentiate between wet-bulb and dry-bulb primers. • Explain how manual throttle controls work. • List the basic functions of a governor. • Explain the operation of air-vane, centrifugal, and vacuum governors. Learning Objectives
5.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Principles of Carburetion • Engine cannot run on liquid fuel – Carburetor vaporizes fuel • Conditions – Starting – Idling – Part throttle – Accelerating – High speed
6.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • 15:1 by weight • Fuel weighs more than air • 9000 ft3 air/1 ft3 fuel • Proper ratio varies – Speed – Load Air-Fuel Mixture
7.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Carburetor Pressure Differences • Different pressures inside carburetor – Mix fuel and air • Vacuum • Atmospheric pressure • Venturi principle
8.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Vacuum • Less than atmospheric pressure • Created by downward stroke of piston – Volume increase – Pressures equalize if possible • Absolute vacuum – Never reached in small engine
9.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Atmospheric Pressure • Weight of air • Varies with altitude • Forces air to fill vacuum – Rate of flow varies with difference
10.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Venturi increases air speed • Causes proportional pressure drop Venturi Principle
11.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Main Nozzle • Carburetor main nozzle – Low-pressure area of venturi – Vacuum draws fuel out of nozzle – Air bleed helps atomize fuel • Pressure drop decreases fuel’s boiling point – Causes fuel to flash
12.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Main Nozzle Operation
13.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Types of Carburetors • Classified by direction of airflow • Natural draft carburetors – Require less space at top of engine • Updraft carburetors – Have smaller passages • Downdraft carburetors – Provide larger volumes of air-fuel mixture
14.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Natural Draft Carburetor (Deere & Co.)
15.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Updraft Carburetor
16.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Downdraft Carburetor
17.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Float-Type Carburetors • Float – Seats needle valve when fuel level is high – Unseats needle valve when fuel level is low – Come in many shapes – Made from brass or foam • Float bowl ventilation – Provides atmospheric pressure to bowl
18.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Choke • Located on intake side of carburetor • Closes to provide rich mixture • Increases vacuum
19.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Located on outlet side of carburetor • Regulates flow of mixture to cylinder • Controls engine speed – Operator control – Governor Throttle
20.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Load Adjustment • Regulates fuel entering main nozzle • Load adjustment needle – Adjustable • Fixed jet or orifice – Nonadjustable
21.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Acceleration System • Open throttle allows more airflow – Extra fuel needed • Plunger-type pump used on large engines • Acceleration well – Stores fuel for acceleration – Becomes air bleed when empty
22.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Economizer Circuit • Passage on engine side of open throttle • Engine draws air from passage • Reduces float bowl pressure • Less fuel through main nozzle
23.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Idling Circuit • Provides fuel to keep engine running • Mixture adjusted with idle-adjusting needle • Bypass air pressurizes circuit
24.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Main discharge orifice exposed to vacuum • No airflow • Main nozzle inoperative Idle (Zenith Div., Bendix Corp.)
25.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Main and secondary discharge orifices exposed to vacuum • Limited airflow • Main nozzle inoperative Part Throttle
26.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Idle circuit inoperative • Full airflow • Main nozzle supplies fuel Full Throttle
27.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Diaphragm-Type Carburetors • Built-in impulse diaphragm fuel pump • Intake stroke – Fuel enters lower chamber • Compression stroke – Spring pressure return diaphragm – Pushes fuel into upper chamber • Fuel enters airflow through venturi
28.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Throttle open • Choke closed • High vacuum • Fuel from idle discharge ports and main nozzle Diaphragm Carburetor Starting
29.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Choke open • Throttle closed • No airflow • No vacuum in venturi • Fuel from primary idle discharge port only Diaphragm Carburetor Idle
30.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Choke open • Throttle partly open • Low vacuum in venturi • Fuel from primary and secondary idle discharge ports Diaphragm Carburetor Part Throttle (Rupp Industries, Inc.)
31.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Choke open • Throttle open • High airflow • High vacuum in venturi • Fuel from idle discharge ports and main nozzle Diaphragm Carburetor Full Throttle
32.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Vacuum Carburetors • Simple design • Draw fuel directly from tank • Atmospheric pressure at top of tank • Fuel metered by holes exposed by throttle • Less fuel delivered as tank empties – Modern units have fuel pump and fuel cup – Provide consistent fuel delivery
33.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Vacuum Carburetor with Integral Fuel Pump
34.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Primers • For cold starting • Force fuel into carburetor • Wet bulb primers • Dry bulb primers • May be installed in carburetor • May be remotely mounted
35.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Manual Throttle Controls • Open and close throttle valve • May be used alone – Chainsaw, motorcycle, outboard engine • May be used with governor – Lawnmowers, power washers, etc. – Manual throttle control sets speed – Governor maintains desired speed
36.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Governor Throttle Controls (Deere & Co.)
37.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Types of Governors • Air vane (pneumatic) governor • Centrifugal (mechanical) governor • Vacuum governor • All types perform same function • Each type uses different sensing method
38.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Airflow from flywheel cooling fins • Air vane attached to throttle valve • Governor spring acts to open throttle • Air vane acts to close throttle Air Vane (Pneumatic) Governor (Tecumseh Products Co.)
39.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Air Vane (Pneumatic) Governor • Spring tension must be calibrated – Replace/fix damaged springs and linkages – Mower blades speed less than 19K fpm • Fixed speed governors – Limited range of adjustment • Variable speed governors – Throttle control adjusts spring tension
40.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Centrifugal (Mechanical) Governors • Governor gear spins with camshaft – Centrifugal force moves flyweights outward – Lever moves to close throttle valve • Governor spring acts to close throttle valve – Adjusted by changing spring tension
41.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Centrifugal (Mechanical) Governor Operation
42.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. • Fixed speed • Operator controlled • Adjustment knob • Spring position on governor lever Governor Speed Setting (Briggs and Stratton Corp.)
43.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Vacuum Governors • Farm and industrial engines • Vacuum diaphragm operates lever – High vacuum closes throttle valve • Low vacuum allows spring to open throttle
44.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Vacuum Governor
45.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Governor Features • Stability – Instability results in hunting – Excessive stability results in dead-beat governor • Sensitivity – Excessive sensitivity results in hunting – Inadequate sensitivity results in inadequate correction
46.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review Summarize the venturi principle. A restriction in an air passage speeds up airflow and causes a proportional decrease in pressure.
47.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review Of updraft, downdraft, and natural draft carburetors, which type operates with the lowest air velocities, and why? Downdraft carburetors. Gravity helps the air-fuel mixture to flow into the cylinder.
48.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review Why is the carburetor float bowl vented to the atmosphere? The vent applies atmospheric pressure to the fuel in the bowl. Since the carburetor venturi is at low pressure, the pressure difference forces fuel through the main nozzle.
49.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review In a diaphragm carburetor, what returns the diaphragm to its original position, forcing fuel into the carburetor? Spring pressure
50.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review Summarize the differences between a wet-bulb and dry-bulb primer. A wet-bulb primer is full of fuel, and acts like a fuel pump to force fuel into the carburetor. A dry-bulb primer pumps air into the float bowl, increasing air pressure, which forces fuel up the main nozzle.
51.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review List several applications that require the operator to have sole control of the throttle. Chainsaws, snowmobiles, motorcycles, or string trimmers.
52.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review What is the purpose of a governor? It maintains a constant engine speed under changing load conditions.
53.
Permission granted to
reproduce for educational use only. © Goodheart-Willcox Co., Inc. Review Which type of governor uses pivoted flyweights? Centrifugal (mechanical) governor
Download now