Understanding Engine Bore and Stroke

What is the definition of engine bore?

• The distance the piston travels in one direction.

• The diameter of the cylinder in which the piston moves.

• The total volume of all the cylinders in an engine.

• The length of the crankshaft.

What is the definition of engine stroke?

• The diameter of the cylinder in which the piston moves.

• The distance the piston travels from the top to the bottom of the cylinder.

• The total volume of all the cylinders in an engine.

• The length of the crankshaft.

How is the bore and stroke ratio calculated?

What effect does a larger bore have on engine performance?

• Increases torque but decreases power.

• Increases power but decreases torque.

• Increases both power and torque.

• Decreases both power and torque.

What effect does a longer stroke have on engine performance?

• Increases torque but decreases power.

• Increases power but decreases torque.

• Increases both power and torque.

• Decreases both power and torque.

Which measurement technique is commonly used to measure the bore of an engine?

• Using a micrometer.

• Using a vernier caliper.

• Using a bore gauge.

• Using a ruler.

Which measurement technique is commonly used to measure the stroke of an engine?

• Using a micrometer.

• Using a vernier caliper.

• Using a bore gauge.

• Using a ruler.

In engine design, what is a common application of a square engine (bore equals stroke)?

• High-speed racing engines.

• Engines designed for maximum fuel efficiency.

• Engines designed for balanced power and torque.

• Engines designed for low emissions.

What is the typical characteristic of an undersquare engine (stroke is longer than bore)?

• High RPM capability.

• High torque at low RPM.

• High power at high RPM.

• Low torque at low RPM.

What is the typical characteristic of an oversquare engine (bore is larger than stroke)?

• High torque at low RPM.

• High power at high RPM.

• Low power at high RPM.

• Low torque at high RPM.