Engine Dissection. You are dissecting a 3.5 HP single cylinder, 4 cycle engine, made by Briggs and Stratton in Milwaukee, Wisconsin

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Mildred Bates
5 years ago
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1 Egie Dissectio You are dissectig a 3.5 HP sigle cylider, 4 cycle egie, made by Briggs ad Stratto i Milwaukee, Wiscosi These egies are typically used i law mowers, sow blowers, go-carts, etc (ref. 2, Used by permissio of Briggs ad Statto, 1992, all rights reserved) Egie.ppt - 1 of 20

2 Egie Module Cotets Refereces History Egie Classificatios Complemetary Techologies Egie Operatio Priciples Fuel Delivery (carburetors ad fuel ijectio) Igitio Systems Maufacture ad Materials Issues (uder costructio) Egie.ppt - 2 of 20

3 Refereces 1) Why Iteral Combustio?, Rudi Volti, Ivetio ad Techology, Fall 1990, pp ) Briggs ad Stratto Service ad Repair Istructios for sigle cylider 4-cycle egies, ) Iteral Combustio Egies ad Air Pollutio, Edward Obert, Itext Educatio Publishers, New York, ) Itroductio to Iteral Combustio Egies, Richard Stoe, Macmilla, Egie.ppt - 3 of 20

4 Classificatio of Egies Exteral vs Iteral Combustio Spark Igitio SI or Compressio Igitio CI Cofiguratio Valve Locatio 2 Stroke or 4 Stroke Egie.ppt - 4 of 20

5 Egie Cofiguratios I Lie (Automobile) Horizotally Opposed (Subaru) V (Automobile) Radial (Aircraft) Opposed Pisto (crakshafts geared together) Egie.ppt - 5 of 20

6 Valve Locatio L Head (Briggs) I Head (typical automobile egie) Advatages: Disadvatages: Egie.ppt - 6 of 20

7 History of IC Egies 1860 Leoir s egie (a coverted steam egie) combusted atural gas i a double actig pisto, usig electric igitio Egie.ppt - 7 of 20

8 History - cotiued 1876 Nikolaus Otto pateted the 4 cycle egie, it used gaseous fuel 1882 Gottlieb Daimler, a egieer for Daimler, left to work o his ow egie. His 1889 twi cylider V was the first egie to be produced i quatities. Used liquid fuel ad Veturi type carburetor, egie was amed Mercedes after the daughter of his major distributor 1893 Rudolf Diesel built successful CI egie which was 26% efficiet (double the efficiecy of ay other egie of its time) Egie.ppt - 8 of 20

9 Complemetary Techologies for IC Egie-powered Automobiles Peumatic tires (1888, Dulop) Cheap liquid fuels (Oil idustry bor i PA 1859) Veturi effect carburetor (1892, Willi Maybach) Variable mechaical trasmissio (primitive type by Levassor, 1891) Electric starter (Ketterig 1912) Egie.ppt - 9 of 20

10 Parts of a IC Egie Name as may parts as you ca CROSS SECTION OF OVERHEAD VALVE FOUR CYCLE SI ENGINE Egie.ppt - 10 of 20

11 Cylider head Air cleaer Breather cap Parts of a IC Egie Choke Throttle Itake maifold Exhaust maifold Pisto rigs Pisto Wrist pi Cylider block Coectig rod Oil gallery to pisto Oil gallery to head Crakcase Crakpi Crakshaft Rocker arm Valve sprig Valve guide Pushrod Sparkplug Combustio chamber Tappet Dipstick Cam Camshaft Water jacket Wet lier Coectig rod bearig Mai bearig If you scored: You are a certified Gear Head Chage your ow oil You really eed this class <10 Take your car to Jiffy Lube Oil pa or sump Egie.ppt - 11 of 20

12 4 Cycle Process Itake Valve Itake Maifold Cylider Exhaust Valve Exhaust Maifold Spark Plug 4 Pisto Coectig Rod Crak Crakcase Itake Stroke Itake valve opes, admittig fuel ad air. Exhaust valve closed for most of stroke Compressio Stroke Both valves closed, Fuel/air mixture is compressed by risig pisto. Spark igites mixture ear ed of stroke. Power Stroke Fuel-air mixture burs, icreasig temperature ad pressure, expasio of combustio gases drives pisto dow. Both valves closed - exhaust valve opes ear ed of stroke Exhaust Stroke Exhaust valve ope, exhaust products are displaced from cylider. Itake valve opes ear ed of stroke. Egie.ppt - 12 of 20

13 Briggs Egie - Itake Egie.ppt - 13 of 20

14 Compressio Egie.ppt - 14 of 20

15 Power Stroke Egie.ppt - 15 of 20

16 Exhaust Stroke Egie.ppt - 16 of 20

17 2 Stroke Process Compressio (ports closed) Air Take Ito Crakcase Combustio (ports closed) Exhaust (itake port closed) Air compressed i crakcase Scavegig ad Itake (ports ope) Egie.ppt - 17 of 20

18 Rotary Wakel Egie Ref. Iteral combustio egies ad air pollutio, E. F. Obert Egie.ppt - 18 of 20

Veturi-type Carburetor Air/Fuel Mixture To Egie Beroulli Effect: P+1/2 ρv 2 = Costat Throttle Plate Atomized Fuel Fuel Ilet Valve Stem Float Bowl Costat level is maitaied i bowl - as

19 Veturi-type Carburetor Air/Fuel Mixture To Egie Beroulli Effect: P+1/2 ρv 2 = Costat Throttle Plate Atomized Fuel Fuel Ilet Valve Stem Float Bowl Costat level is maitaied i bowl - as float moves dow, valve stem moves dow, allowig more fuel ito bowl, float moves up ad closes valve Fuel Nozzle Veturi Meterig Orifice Egie.ppt - 19 of 20 Choke Plate Ilet Air Ref. Obert

20 Fuel Ijectio (electroic, multi-port) TRIGGER COMPUTER INJECTOR DRIVE UNIT Moitored Egie Operatig Coditios: Maifold Pressure Egie Speed Air Temperature Coolat Temperature Acceleratio Pressure Regulator 50 psi typical Fuel Filter Fuel Pump Ijectors FUEL TANK Egie.ppt - 20 of 20

Engine Project. These engines are typically used in lawn mowers, snow blowers, go-carts, etc

Engine Project. These engines are typically used in lawn mowers, snow blowers, go-carts, etc Engine Project Your team is going to dissect and assemble a 3.5 HP single cylinder, 4 cycle engine, made by Briggs and Stratton in Milwaukee, Wisconsin These engines are typically used in lawn mowers,