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Ub8 Part 1.

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Presentation on theme: "Ub8 Part 1."— Presentation transcript:

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2 Ub8 Part 1

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4  A cylinders displacement is the volume of the cylinder when the piston is at BDC.  It is the sum of the displacement of each cylinder.  It is defined as the volume of air/fuel mixture an engine can draw in.

5 Ex: 700 cc (cubic centimetres) 1000 cc = 1 Litre

6 Example : Vehicle has 4 cylinders : Each cylinder has a volume of 700cc : 700cc X 4 = 2800cc : 2800cc = 2.8 Litre

7  Torque is the term used to describe a rotating force.  More torque generally means a car can accelerate faster  Torque is the actual reading of how “hard” and with how much “Force” the engine turns.

8  Horsepower: 1 hp = 33,000 lb-ft / min  One horsepower is the ability to lift pounds one foot in one minute  The horsepower specification for an engine tells you how much power the engine can produce.  Horsepower is the rate at which the engine does work

9 Formula:  HORSEPOWER = (TORQUE * RPM) / 5252  A engine that makes 300 pound-feet of torque at 4,000 RPM produces  [(300 x 4,000) / 5,252] 228 horsepower at 4,000 RPM

10  Think about:  Torque being how hard you can pound away on bicycle pedals  Horsepower being how fast you can spin the bicycle pedals.

11  What is engine displacement?  What is horsepower?  What is Torque?  What are the different parts of an engine?

12  _ohQ&feature=related _ohQ&feature=related  Part 2

13 Spark plug Inlet valve Exhaust valve CylinderPiston The four-stroke engine

14  Is a can-shaped part closely fitted inside the cylinder.  Piston rings consist of compression rings and oil rings.  Crankshaft takes the up-down motion of the piston and convertors it to a rotation motion  Connecting rod connects the piston to the crankshaft.

15  The 4 Stroke engine cycle consist of these: 1) Intake 180degree 2) Compression 180 degree 3) Power/ Combustion 180 degree 4) Exhaust 180 degree  Total engine revolution 720 degree  One complete engine cycle consists of 4 engine strokes.

16  The Intake Stroke consist of the piston travelling down.  Intake valves are open to allow Air/Fuel mixture to come into the combustion chamber.

17  Intake plastic ducts  Intake manifolds

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19 - Fuel injectors are electronically controlled valves that spray fuel to mix with air. - Creating that air fuel mixture -

20  It is an electrical device that fits into the cylinder head and ignites air fuel mixtures.

21 Inlet valve open INTAKE STROKE The four-stroke engine Exhaust valve closed

22 Inlet valve open Piston down INTAKE STROKE The four-stroke engine Exhaust valve closed

23 Inlet valve open Piston down INTAKE STROKE The four-stroke engine Fuel in Exhaust valve closed

24 Inlet valve open Piston down INTAKE STROKE The four-stroke engine Fuel in Exhaust valve closed

25  What is the purpose of the intake system?  What is the purpose of the spark plug?  What is the purpose of the fuel injector?  What is happening during the intake stroke?

26  Part 3  TM TM

27  Compression stroke consist of the piston travelling back up.  Both intake and exhaust valves are closed  Air fuel mixture is now being compressed

28 Inlet valve closed COMPRESSION STROKE The four-stroke engine Piston up Exhaust valve closed

29 Inlet valve closed COMPRESSION STROKE The four-stroke engine Piston up Exhaust valve closed

30 Inlet valve closed COMPRESSION STROKE The four-stroke engine Piston up Exhaust valve closed

31  The piston is now at the TDC  Spark plug ignites, creating a spark that ignites the compressed air fuel mixture.  Explosion is created and the piston is forced back down.  Hence the Power stroke  Both valves are still closed

32 Inlet valve closed POWER STROKE The four-stroke engine BANG Exhaust valve closed

33 Inlet valve closed POWER STROKE The four-stroke engine Piston down powerfully Exhaust valve closed

34 Inlet valve closed POWER STROKE The four-stroke engine Piston down powerfully Exhaust valve closed

35 Inlet valve closed POWER STROKE The four-stroke engine Exhaust valve closed

36  Exhaust stroke the piston is travelling up  Exhaust valve is open  Intake valve is Closed  Exhaust gases being pushed out by piston

37 Inlet valve closed EXHAUST STROKE The four-stroke engine Exhaust valve closed

38 Inlet valve closed EXHAUST STROKE The four-stroke engine Exhaust valve open Piston up Exhaust gases out

39 Inlet valve closed EXHAUST STROKE The four-stroke engine Exhaust valve open Piston up Exhaust gases out

40 Inlet valve open INTAKE STROKE The four-stroke engine Exhaust valve closed

41 And so the cycle continues!!

42  The exhaust system is needed to provide a pathway for exhaust fumes to be filtered and to reduce noise.  Exhaust manifold  Catalytic convertor  Muffler

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44 - What is the purpose of the compression stroke and what is happening - What is the purpose of the power stroke and what is happening? - What is happening during the exhaust stroke?  What is the purpose of the exhaust system?

45 WUWMmimjQ&feature=related o/car-parts-videos- playlist.htm#video Video of 4 Stroke cycle

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47  SoU&feature=related SoU&feature=related


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