Upgrade to remove ads
Only $35.99/year

Power (Engine Cooling)

Terms in this set (20)

Engine Cooling
All ICE must operate at a certain temperature
to produce the best results and they seldom
give the greatest efficiency unless the
temperature around the cylinder
Air Cooling
Cooling effect is produced usually by means of
fins or projections
Air Cooling
arrangement of fins increases the
radiating surface thus heat escapes faster
Air Cooling
Air-cooled engines are usually of small bore
and stroke (small cylinder)
1. lighter in weight
2. simpler in construction
3. more convenient and less troublesome
4. no danger of freezing in cold weather
Air Cooling: ADVANTAGES
1. difficult to maintain proper cooling under all
conditions
2. impossible to fully control cylinder
temperature
3. runs a little hotter than water-cooled engines
4. require the use of heavier lubricating oil
Air Cooling: DISADVANTAGES
Water Cooling
Employed by almost all types of engine
Water Cooling
the cylinders are surrounded by water compartment enclosed by jackets.
1. plentiful and readily available
2. absorbs heat well
3. circulates freely at all temperature between freezing
and boiling points
4. neither dangerous, harmful nor disagreeable to
handle
Water Cooling: ADVANTAGES
1. high freezing point
2. cause excessive corrosion of the radiator and certain
metal parts of the engine
3. cause troublesome deposits in cylinder jackets
4. evaporation and boiling require frequent
replenishing
Water Cooling: DISADVANTAGES
Water Cooling: THERMOSIPHON
Obeys the law of convection
Water Cooling: FORCED CIRCULATION
Uses pump to force water through the jackets, a radiator to expose large cooling surfaces, and a fan to circulate air through the radiator
Components: PUMP
• Used to circulate the water
• Typically centrifugal type
• Derives power from the engine
Components: FAN
Made to rotate much faster than the crankshaft to improve air-handling capacity
Components: RADIATOR
• Water to air heat exchanger
• Fins provide much surface area for heat transfer to the air
• Larger radiators are required for larger engines
Components: RADIATOR CAP
Contains a pressure relief valve which prevents pressure built-up inside the radiator
Components: OVERFLOW TANK
...
Components: THERMOSTAT
• Valve which automatically opens and closes in response to temperature changes
• Allows fast warm-up when the engine is started and maintains optimum engine temperature according to load and other variables
Components: THERMOSTAT
• Allows fast warm-up when the engine is started and maintains optimum engine temperature according to load and other variables
• Antifreeze (ethylene glycol) - useful for temperate countries
• Chemical inhibitors (acid neutralizers)
• Foam suppressors
• Rust inhibitors
• Dye (for identification
Coolant Additives
Sets found in the same folder