Four Stroke Engine
Read all Instruction Carefully
You will partially disassemble and then reassemble a one cylinder, 4 stroke engine. You must become familiar with the major parts of the engine and also know the four stroke cycle.
Objective:
Equipment:
Procedure:
Step 1: Get set up
******* Before proceeding to Step 2, start a new Microsoft Word document make a title page. Next, press enter until you move down to page 2 and begin answering the questions.
Step 2: Investigate
Answer all questions in the Microsoft Word program and save the file to your folder you created in Step 1. To Find the answers, go to Appendix A.
Answer questions in sentence form.
It is important to understand the difference between a four stroke and two stroke engine. Go to the site mentioned below and click on the link “two stroke basics” (top right of the page). Look at the diagram and the explanation.
http://science.howstuffworks.com/two-stroke.htm
Now, click on “How Horsepower Works” in the yellow box, part way down the page. Now, find the “Definition” link.
Go to the web page http://www.keveney.com/otto.html and carefully read through the information. Add the answers to the following questions to the file.
Step 3: Disassemble/Assemble Engine
**** To complete Step 3 get the engine, instruction book and tools from Mr. MacPherson.
Read all Instruction Carefully
You will partially disassemble and then reassemble a one cylinder, 4 stroke engine. You must become familiar with the major parts of the engine and also know the four stroke cycle.
Objective:
- Learn the main parts of the engine.
- Know the four strokes of a four cycle engine.
- Disassemble and successfully reassemble an engine.
Equipment:
- Briggs & Stratton engine.
- Hand tools.
- Instructions.
- Computer
Procedure:
Step 1: Get set up
- Double click on the “ My Computer ” icon on the desktop.
- Double click on the W:\ drive.
- Choose Make a New Folder from the left of the page.
- Name the folder “ yourclass_engine” Example 7A_engine.
- Now exit all boxes that you have open on your screen.
******* Before proceeding to Step 2, start a new Microsoft Word document make a title page. Next, press enter until you move down to page 2 and begin answering the questions.
Step 2: Investigate
Answer all questions in the Microsoft Word program and save the file to your folder you created in Step 1. To Find the answers, go to Appendix A.
Answer questions in sentence form.
- What two materials are used to make the cylinder block?
- Why is a steel sleeve sometimes used in an aluminum cylinder block?
- Why is aluminum used for cylinder heats (2 reasons)?
- What do the cooling fins do for an engine?
- What is the hole called that holds the piston while it travels up and down?
- Why does the crankcase have to be very built strong?
- What is used for lubricating the parts in the crankcase of a four-stroke engine?
- What is used for lubricating the parts in the crankcase of a two-stroke engine?
- Why is the piston a little smaller than the cylinder hole?
- How is the piston lubricated so that it flows freely up and down?
- Why are there expandable rings on the piston?
- What is the function of the connecting rod?
- Name the major rotating part in the cylinder block.
- What is the benefit of using bearing on each end of the fast turning crankshaft?
It is important to understand the difference between a four stroke and two stroke engine. Go to the site mentioned below and click on the link “two stroke basics” (top right of the page). Look at the diagram and the explanation.
http://science.howstuffworks.com/two-stroke.htm
- List the three advantages of a two-stroke engine over a four-stroke engine.
Now, click on “How Horsepower Works” in the yellow box, part way down the page. Now, find the “Definition” link.
- Who invented the term horsepower?
- What else was this guy famous for (2 things)?
- Explain the meaning of the word horsepower as it relates to the amount of work done.
Go to the web page http://www.keveney.com/otto.html and carefully read through the information. Add the answers to the following questions to the file.
- What year was the four stroke engine first demonstrated and by whom?
- What are the four strokes of the cycle and briefly explain each.
Step 3: Disassemble/Assemble Engine
**** To complete Step 3 get the engine, instruction book and tools from Mr. MacPherson.