Engine Sizes and Calculations:



Engine Sizes and Calculations: Lab – 1 Chapter 3

Name: ____________________________________________________

Date: __________________________________________________

Use the formulas on pages 63-65 in your book to answer the following:

1. Given the following;

Bore = 2”

Stroke = 4”

Cylinders = 4

1a. Size in cubic Inches _________________

1b. Size in Liters ____________________

2. Given the following;

Bore = 2.5”

Stroke = 3.75”

Cylinders = 8

2a. Size in cubic Inches _________________

2b. Size in Liters ____________________

Now calculate the compression ratio for the following:

piston = 40.5 cu. in.

combustion chamber = 5.5 cu. in.

3a. compression ratio ______________________

piston = 50.5 cu. in.

combustion chamber = 4.5 cu. in.

3b. compression ratio ______________________

piston = 60.5 cu. in.

combustion chamber =10.5 cu. in.

3c. compression ratio ______________________

Calculate the HP/Liter efficiency of the following engines:

A> 4.6L= 305 HP HP/L = __________________

B> 1.8L = 205 HP HP/L = __________________

C> 2.5L = 150 HP HP/L = __________________

D> 3.6 = 250 HP HP/L = __________________

Which engine was most efficient? ______________

Which was the least? _____________

Horsepower (hp) is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.[1] Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation

Brake horsepower (bhp) is the measure of an engine's horsepower before the loss in power caused by the gearbox, alternator, differential, water pump, and other auxiliary components such as power steering pump, muffled exhaust system, etc





Calculate BHP for the following engines =

a.

Torque = 200

RPM = 4400

HP = ____________

b.

Torque = 150

RPM = 2000

HP = ____________

c.

Torque = 200

RPM = 8000

HP = ____________

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