Four-Stroke Engine Worksheet - WordMint - Free Printable

Let's solve this Four-Stroke Engine vocabulary matching exercise step by step. We are given a list of definitions (1–22) and a list of possible answers (A–V). The goal is to match each definition with the correct term.

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Step-by-step Matching:

1. space in which a piston travels
→ This is the cylinder.
✔ R. cylinder

2. to produce a loud sound
→ This means to resonate.
✔ T. resonate

3. valve which opens during the proper time to allow the air/fuel mixture to be drawn into the cylinder
→ This is the intake valve.
✔ L. intake valve

4. condition in which the air/fuel mixture becomes ignited before the spark plug fires
→ This is pre-ignition.
✔ O. pre-ignition

5. device which mixes air and fuel
→ This is the carburetor.
✔ Q. carburetor

6. process of getting fuel and air required for combustion
→ This is intake.
✔ V. intake

7. ignition of air/fuel mixture
→ This is power stroke (when the mixture ignites and pushes the piston).
✔ K. power

8. auto-ignition of the air/fuel mixture caused by high cylinder temperatures and pressures
→ This is detonation (also known as knocking).
✔ P. detonation

9. valve which opens during the proper time to allow the used air/fuel mixture to be released from the cylinder
→ This is the exhaust valve.
✔ E. exhaust valve

10. bearing on which the crankshaft rotates
→ This is the journal (the bearing surface).
✔ H. journal

11. component in an engine which moves up and down due to pressure
→ This is the piston.
✔ G. piston

12. compression of air/fuel mixture in the cylinder
→ This is compression.
✔ F. compression

13. release of the used air/fuel mixture
→ This is exhaust.
✔ A. exhaust

14. turns reciprocation motion of the piston into a rotating motion
→ This is the crankshaft.
✔ I. crankshaft

15. a cleaner attached to the carburetor that is designed to remove dirt and dust from the air before it mixes with the fuel
→ This is the air filter.
✔ B. air filter

16. gasoline is usually designated by this number - ex. 87,89,93
→ These numbers refer to octane rating.
✔ S. octane rating

17. most manufacturers of small gas engines recommend the use of oil with a ________ of SE, SF, SD, or SC – it is clearly marked on every container
→ These are service classifications (e.g., API service ratings).
✔ D. service classification

18. oil is also rated according to the ________, or thickness of the oil
→ This is viscosity.
✔ U. viscosity

19. professional association and standard development organization with a special focus on transport sectors
→ This refers to SAE (Society of Automotive Engineers).
✔ N. SAE

20. both a dry element filter and an oil-foam cover
→ This describes a dual-element filter.
✔ J. dual-element filter

21. this tool is used to analyze a cylinder for wear once the piston, rings, and connecting rod are removed
→ This is a telescoping gauge (used to measure bore wear).
✔ M. telescoping gauge

22. a ______ is used to measure connecting rod bearing clearance
→ This is plastigage (a plastic thread used to measure clearance).
✔ C. plastigage

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Final Answer Key:

| # | Answer |
|---|--------|
| 1 | R. cylinder |
| 2 | T. resonate |
| 3 | L. intake valve |
| 4 | O. pre-ignition |
| 5 | Q. carburetor |
| 6 | V. intake |
| 7 | K. power |
| 8 | P. detonation |
| 9 | E. exhaust valve |
|10 | H. journal |
|11 | G. piston |
|12 | F. compression |
|13 | A. exhaust |
|14 | I. crankshaft |
|15 | B. air filter |
|16 | S. octane rating |
|17 | D. service classification |
|18 | U. viscosity |
|19 | N. SAE |
|20 | J. dual-element filter |
|21 | M. telescoping gauge |
|22 | C. plastigage |

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✔ All matched correctly!

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