Small Engines #51-75

The compression ratio tells us about the engine's:

• . Horsepower
• Torque
• Efficiency
• All of the above

The cam lobes:

• Are timed with the camshaft gear so the valves are lifted at the correct time
• Contour determines the speed of the valve opening
• Contour determines the length of time the valves are open
• All of the above

Which of these is not a reason for valve failure?

• Burned
• Dished
• Carboned
• Necked

The first one or two numbers of the model number system indicates:

• Horsepower
• Oil capacity
• Cubic Inch Displacement
• Position of the crankshaft and carburetor

If there is a difference in the size of the valve head, the intake valve is __________ than the exhaust valve

• The same size
• Smaller
• Larger

Valves have to seal well enough to stand pressures up to __________ pounds per square inch.

• 250 PSI
• 500 PSI
• 750 PSI
• 1000 PSI

The function of the crankcase breather is to remove __________ from the crankcase.

• Oil
• Air
• Dirt
• Gum

For the valves to open at the proper time the __________ marks must be aligned

• Spring
• Hobbing
• Timing
• Plug

The compression release is designed to:

• Reduce Vibration
• Prevent Backfiring
• Shut off the engine
• Allow Easier Starting

Valves are held in the closed position by valve guides.

• True
• False