1. Otto 4 Stroke Cycle SI Anthony Davison
Welcome to Neath Port Talbot College!
MV NPTC

2. Nicolaus August Otto Otto 4 stroke cycle
Anthony Davison
Nicolaus August Otto
Otto 4 stroke cycle
Nicolaus August Otto the inventor of the four-stroke cycle was born on 14th June 1831 in Holzhausen (Germany).
In 1862 he began first experiments with four-strokes engines. Together with Eugen Langen he founded the first engine company - "N.A.Otto & Cie".
Then they improved the atmospheric gas engine and in 1867 they won a gold medal at the Paris Exposition. He died on 26th January 1891 in Cologne.
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

3. Engine Components Cylinder & Piston Components
Anthony Davison
Engine Components
Cylinder & Piston
Components
The term given to the revolving motion of the crankshaft to the up and down motion of the piston is called what?
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
Reciprocating Motion
MV NPTC

4. Swept Volume Π r2 X stroke Swept volume is calculated
Anthony Davison
Swept Volume
Swept volume is calculated
using the following formula.
Π r2 X stroke
Π = 3.142
If the diameter was 80mm the radius would be 40mm.
If we take the strike as 90mm, the calculation would be
3.142 x 40 x 40 x 90 x 4 cyl = 1.8 Ltr
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

5. Cycle of Events The term “cycle” means what ?
Anthony Davison
Cycle of Events
The term “cycle”
means what ?
Any complete round or series of occurrences that repeats or is repeated.
E.g. Days of the week, months of the year etc
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

6. 4 Stroke Cycle Anthony Davison
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

7. Video of cycle 4 Stroke Cycle (If no web service) Anthony Davison
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

8. Anthony Davison
Induction Stroke
As The piston is drawn down during the intake stroke, the camshaft opens the intake valve and a fresh charge of fuel/air mix is drawn into the cylinder.
The intake valve closes, when the piston reaches the bottom of its downward stroke.
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

9. Anthony Davison
Compression Stroke
The piston now begins to move upward and starts to compress the air/fuel mixture in the cylinder. Both valves are closed.
As the mixture get compressed, it gets volatile ( ready to burn). Just before TDC a spark ignites the mixture and a flame spreads across the cylinder burning the mixture of fuel and air.
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

10. Power Stroke The fuel air mixture now BURNS very rapidly,
Anthony Davison
Power Stroke
The fuel air mixture now BURNS very rapidly,
increases in pressure generated by combustion, forces the piston downward in the cylinder.
Both valves are still closed. This is the only stroke that creates power in the 4 stroke cycle.
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

11. Anthony Davison
Exhaust Stroke
Upon completion of the power stroke, the piston starts to move upward again and now the exhaust valve starts to open. The continuing upward movement forces the hot burned gases out past the exhaust valve.
When The piston reaches the top of the cylinder the exhaust valve closes. The piston starts to go back down and the cycle repeats itself.
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

12. Perfect Combustion Air Fuel Ratio Stoichiometric Ratio
Anthony Davison
Perfect Combustion
Air Fuel Ratio
Stoichiometric Ratio
Calculation of the quantities of reactants and products in a chemical reaction
14.7 parts of AIR
Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
1 part FUEL
MV NPTC

13. title content Anthony Davison Names of who is presenting and positions
What we are here to do today
NB: you can also copy and use this slide as a template for further slides required with writing
MV NPTC

14. Anthony Davison
MV NPTC