Engine Pre-Test

1. PRETEST CRITIQUE
PRETEST CRITIQUE

2. 1 2 3
4
5
6
7
8
9
10
11
12
13
14
15
16

3. ENGINE PARTSENGINE PARTS
1. OIL PAN
2. DISTRIBUTOR
3. CONNECTING ROD
4. PISTON
5. VALVE COVER
6. PISTON RINGS
7. CAMSHAFT
8. CRANKSHAFT

4. ENGINEENGINE
PARTSPARTS 9. TIMING CHAIN
10. INTAKE MANIFOLD
11. THERMOSTAT
HOUSING
12. CARBURETOR
13. VALVE
14. TIMING COVER
15. CYLINDER HEAD
16. CYLINDER BLOCK
1. OIL PAN
2. DISTRIBUTOR
3. CONNECTING ROD
4. PISTON
5. VALVE COVER
6. PISTON RINGS
7. CAMSHAFT
8. CRANKSHAFT

5. WHAT ARE THE FOUR STROKES OF AWHAT ARE THE FOUR STROKES OF A
FOUR STROKE CYCLE ENGINEFOUR STROKE CYCLE ENGINE
• INTAKE STROKE
• COMPRESSION STROKE
• POWER STROKE
• EXHAUST STROKE
REFER TOREFER TO
CHAPTER #1CHAPTER #1

6. FOUR STROKE CYCLEFOUR STROKE CYCLE
INTAKE
STROKE

7. FOUR STROKE CYCLEFOUR STROKE CYCLE
COMPRESSION
STROKE

8. FOUR STROKE CYCLEFOUR STROKE CYCLE
POWER
STROKE

9. FOUR STROKE CYCLEFOUR STROKE CYCLE
EXHAUST
STROKE

10. FOUR STROKE CYCLEFOUR STROKE CYCLE
EXHAUST
INTAKE
COMPRESSION
POWER

11. FOUR STROKE CYCLEFOUR STROKE CYCLE
IT TAKES TWO REVOLUTIONS OF THE
CRANKSHAFT TO COMPLETE ONE
FULL FOUR STROKE CYCLE.

12. WHAT ISWHAT IS
TTOPOP DDEADEAD CCENTER?ENTER?
(T.D.C.)(T.D.C.)
• WHEN THE PISTON IS
AT THE TOP OF ITS
TRAVEL AND THE
CRANKPIN IS DEAD
CENTER ON THE
CENTER LINE OF THE
CYLINDER.

13. WHAT ISWHAT IS
BBOTTOMOTTOM DDEADEAD CCENTER?ENTER?
(B.D.C.)(B.D.C.)
• WHEN THE PISTON IS
AT THE BOTTOM OF
ITS TRAVEL AND THE
CRANKPIN IS DEAD
CENTER ON THE
CENTER LINE OF THE
CYLINDER. CL

14. WHAT IS “B.T.D.C.” ?WHAT IS “B.T.D.C.” ?
• BBEFORE TTOP DDEAD
CCENTER.
BTDC OR BTCBTDC OR BTC
• WHEN THE PISTON AND
CRANKSHAFT HAVE NOT
ROTATED TO TOP DEAD
CENTER YET.

15. WHAT IS “A.T.D.C.” ?WHAT IS “A.T.D.C.” ?
• AAFTER TTOP DDEAD
CCENTER.
ATDC OR ATCATDC OR ATC
• WHEN THE PISTON AND
CRANKSHAFT HAVE
ROTATED PAST TOP
DEAD CENTER.

16. WHAT IS PISTONWHAT IS PISTON
STROKE?STROKE?
PISTON STROKEPISTON STROKE
THE DISTANCE THE
PISTON MOVES
FROM
TTOP DDEAD CCENTER
TO BBOTTOM DDEAD
CCENTER.

17. • THE VOLUME IN THE
CYLINDER WHEN
THE PISTON IS AT
BOTTOM DEAD
CENTER.
ENGINE DISPLACEMENTENGINE DISPLACEMENT

18. WHAT IS CYLINDER BORE?WHAT IS CYLINDER BORE?
THE DIAMETER OF
THE CIRCLE OF THE CYLINDER

19. WHAT UNITS OF MEASURE IS CYLINDERWHAT UNITS OF MEASURE IS CYLINDER
BORE MEASURED WITH?BORE MEASURED WITH?
• INCHESINCHES
• MILLIMETERSMILLIMETERS

20. WHAT IS COMPRESSION RATIO?WHAT IS COMPRESSION RATIO?
• THE VOLUME IN THE CYLINDER
WHEN THE PISTON IS AT BOTTOM
DEAD CENTER (B.D.C.) ~
COMPAIRED TO THE VOLUME IN
THE CYLINDER WHEN THE PISTON
IS AT TOP DEAD CENTER (T.D.C.).

21. COMPRESSIONCOMPRESSION
RATIORATIO
VOLUME ATVOLUME AT
BDCBDC
COMPAREDCOMPARED
TOTO
VOLUME ATVOLUME AT
TDCTDC
CL

22. WHAT IS HEAT OFWHAT IS HEAT OF
COMPRESSION?COMPRESSION?
• HEAT CREATEDHEAT CREATED
WHEN GAS ISWHEN GAS IS
COMPRESSED.COMPRESSED.

23. WHAT IS DIESELING?WHAT IS DIESELING?
SOMETIMES CALLED ENGINE
RUN ON.
• ITS WHEN THE ENGINEITS WHEN THE ENGINE
CONTINUES TO RUN AFTERCONTINUES TO RUN AFTER
THE IGNITION IS SHUT OFF.THE IGNITION IS SHUT OFF.

24. WHAT ISWHAT IS
PREIGNITION?PREIGNITION?

25. WHAT IS
PREIGNITION?
WHEN COMBUSTIONWHEN COMBUSTION
STARTSSTARTS
BEFORE SPARKBEFORE SPARK
IGNITION OCCURSIGNITION OCCURS

26. WHAT ISWHAT IS
DETONATIONDETONATION
WHEN THE LAST
PORTION OF THE AIR
FUEL MIXTURE
EXPLODES DUE TO
THE HIGH PRESSURE
AND HEAT EXERTED
ON IT.

27. WHAT ISWHAT IS
VOLUMETRIC EFFICIENCYVOLUMETRIC EFFICIENCY
• HOW WELL THE ENGINE CAN
FILL ITS CYLINDERS.
• THIS EFFICIENCY CHANGES
WITH RPM.

29. LETS TAKE FIVE!LETS TAKE FIVE!