4 Stroke Theory Review

Engines originally were described as ________ Combustion Engines.

• External

• Internal

• Operational

• Rotary

Internal Combustion Engines were invented in...

• 1860

• 1876

• 1996

• 1890

Which was invented first the four stroke engine or the two stroke engine and who was its inventor.

• 4 stroke by Nikolaus Otto

• 4 stroke by Karl Benz

• 2 stroke by Nikolaus Otto

• 2 stroke by Karl Benz

An Engine Cycle can best be described as...

• A complete round of work in an engine

• Completion of at least 2 strokes

• Intake, Compression, Power, Exhaust

• When gasoline / diesel turns into NOx

In a four stroke engine one stroke is when the piston does what?

• Moves from either (TDC to BDC) or (BDC to TDC)

• Intake Valve opens

• Pushes downward on the crank

• seals the cylinder

What are the four strokes in order?

• Intake, Compression, Power, Exhaust

• Suck, Squeeze, Blow, Bang

• Compression, Intake, Exhaust, Power

• Blow, Squeeze, Bang, Suck

The intake Stroke is when...

• The piston moves from TDC to BDC

• The Intak Valve opens

• A vacuum is created to bring in air / fuel

• All of the above

Compression accomplishes two things... What is one of them.

• Heat up air in the cylinder

• Breakdown fuel into smaller particles

• Allow for smaller combustion force

• Drawing oil into the sump

A compression ratio is the difference in __________ at TDC and BDC

• Volume

• Area

• Square Feet

• Cubic Yard

During the Power Stroke both the intake and exhaust valve are

• Open

• Closed

• Floating

• Sticking