3. 4 Cylinder Engine

7. TDC
(Top Dead Center)
BDC
(Bottom Dead Center)
Piston
Cylinder

9. (Diameter of Cylinder)
Bore
(Diameter of Cylinder)
Stroke
(Measurement of the distance the piston travels from bottom to top.)

10. Engine
Displacement
Compression
Ratio

11. Formula
Volume above the BDC
Total Volume at TDC

12. Total Engine Displacement
Formula
Total Engine Displacement
0.785 x (Bore)2 x Stroke
X number of cylinders

13. Total Cylinder Volume at BDC Total Chamber Volume at TDC
Compression
Ratio

14. TDC
BDC

15. Volume at TDC Volume at BDC
Example:
Volume at TDC
Volume at BDC
.8 cubic inches
9 cubic inches

16. # Cylinders Bore Stroke
Example:
# Cylinders
Bore
Stroke
4 cyl.
3.875 in.
3.25 in.

17. 9 .8
Compression
Ratio
11.25 to 1

18. .785 x (3.875)2 x 3.25 x 4
Engine
Displacement
cubic in.

19. Definition: Measure of how much air and fuel have compressed.

20. The volume of air in all cylinders.
Definition:
The volume of air in all cylinders.

21. CONVERSIONS
centimeters
LITERS

22. Why do we need to convert?
Because today, many engines are sized by cubic centimeters or liters

23. FORMULA:
1 cubic in = cc
(take cubic in. x )
FORMULA:
1,000 cc = 1 liter
(Take cc/1000)

24. Given: Bore = 3.875 inches Stroke = 3.25 inches
Example Of How To Do A Conversion
Given: Bore = inches
Stroke = 3.25 inches
Step 1: Solve the problem using the formulas using the inches.
Answer for Displacement =
cubic inches
Step 2:To convert to Cubic Centimeters (cc)
(Round to the nearest tenth)
Take cubic inches x
( x = 2511)
Step 3: To convert to Liters
Take cc/1000
(2511/1000 = 2.5 liters)