Valve Lapping Quiz

What are the two techniques used for lapping valves?

• Pitting and honing

• Wire wheel and blast

• Hand and drill

• Suction cup and compound

Why is lapping by hand considered the best method?

• It creates a smooth and uniform surface

• It removes all the pits on the valve surface

• It increases the flow of air across the valve

• It prevents the valve from sinking too far into the head

What happens if the valve seat width is too wide?

• The valve gets dirtier and pitted faster

• The valve loses its coating

• The valve becomes junk

• The valve guides reach the service limit

What is the purpose of lapping valves?

• To improve the performance of the engine

• To determine if a valve job is needed

• To remove all the pits on the valve surface

• To increase compression

What does the dull gray surface on the valve and seat indicate?

• A smooth and uniform surface

• A worn and mushroomed surface

• A honed or lapped surface

• A leak path for air

Why is using a drill for lapping valves not recommended?

• It makes the valve susceptible to dirt and pitting

• It removes all the pits on the valve surface

• It creates micro grooves on the valve and seat

• It increases the flow of air across the valve

What happens when a piece of grit gets stuck during lapping with a drill?

• It increases the flow of air across the valve

• It removes all the pits on the valve surface

• It creates micro grooves on the valve and seat

• It makes the valve susceptible to dirt and pitting

What is the recommended method to clean the valve and seat before lapping?

• Break clean and oil

• Suction cup and compound

• Drill and honing

• Wire wheel and blast

What should be done if the valve seat width is over the specified limit?

• Get a valve job from a professional

• Replace the valve with a new one

• Continue lapping until it is within spec

• Increase the size of the valve guide

What is the effect of a wide valve seat on air flow?

• It causes turbulence in air flow

• It has no effect on air flow

• It decreases air flow

• It increases air flow