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Chapter 11

Chapter 11. Cooling Systems page 191. Cooling Systems Types. Air cooling Liquid Cooling Mixture Air/Liquid. Principles of Engine Cooling. Efficiency and life of engine Burned gasses 3600 F Loss of heat through cylinder walls 1200 F to 350 F 100 F by outer fins. COOLING SYSTEMS.

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Chapter 11

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  1. Chapter 11 Cooling Systems page 191

  2. Cooling Systems Types • Air cooling • Liquid Cooling • Mixture Air/Liquid

  3. Principles of Engine Cooling • Efficiency and life of engine • Burned gasses 3600 F • Loss of heat through cylinder walls • 1200 F to 350 F • 100 F by outer fins

  4. COOLING SYSTEMS • Heat Energy From Combustion 1. Cooling and Lubrication systems 33% 2. Exhaust system 33% • Engine power 25% • Frictional loss 5%

  5. How Air Cooling Works • heat passes through cylinder wall • air passes by fins • guided by baffles • Conduction – through a material material • Convection – solid to gas transfer • Radiation – gives off heat

  6. Parts of an Air Cooled system • Fly Wheel • Shrouds • Fins

  7. How Exhaust Cooling Works • 1/3 heat lost through exhaust (muffler) 1200 F • Blocked muffler • Broken muffler

  8. How Water Cooling Works • Passage surrounds cylinder (water jacket) • No fins • water/antifreeze mixture • protects freezing • raise boiling point • prevent corrosion

  9. Parts of the Liquid Cooled System • Radiator • Water pump • Water Jacket • Hoses • Fan • Shroud • Belt • Thermostat

  10. Radiator • Tubes • Fins • Transfers heat • coolant >air

  11. Radiators • Caries water through tubes • Air travels through fins • Together make RADIATIOR CORE • Cross flow & Down flow

  12. Water Pumps • Moves coolant • Boat at lower end of motor • Driven by crankshaft • Types • sliding vane • rotor • plunger • vari-volume

  13. Radiator Cap • Pressurize • Pascal’s Law • 1 psi = 3 F

  14. Observing Thermostat Operation • Opens at preset temp. • Rating stamped on thermostat • Holds coolant in block • Opens to cool

  15. Outboard Water Circulation Systems • Pressure-vacuum water flow system • propeller causes pressure & vacuum • Centrifugal force • no moving parts (propeller)

  16. How Oil Cooling Works • Oil collects dirt and particles • Removes heat (5%)

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