Small Gas Engines Chapter 1 and 2

What are the three tasks performed by the flywheel?

Fins for cooling Magnets produce electricity Keeps Crankshaft turning

The angled face of each valve will close tightly against a smooth ....cut around each port opening.

Seat

The cyliner block is generally made of...

Steel/Cast Iron or Aluminum

Main bearing

The bearings which suppport the crankshaft

Why is there a difference in temperature between the intake and exhaust valve?

The exhaust valve has to deal with hot gases.

How does compression increase the engine power?

Tightly packed molecules want to expand more. Compression brings the air-fuel mixture close to flash point.

Why are metal fins made as a part of the block surrounding the cylinder?

To air cool the engine

What is attached to the piston?

connecting rod

What is designed into the crankshaft to provide for engine balancing?

counterweights

What does the connecting rod connect the piston to?

crankshaft

What is the hole in the block called?

cylinder

What is moved by and stores the energy of the piston?

flywheel

What are the 4 strokes of a Four-Stroke engine?

intake compression firing/power exhaust

The time during the four-stroke cycle when both valves are open is called........

overlap

What is the "Lid" of the hole called?

piston

What are the 3 things an engine needs to run?

spark fuel compression

What are the two methods for lubrication four cycle engines?

splash pump

What is the main housing of the engine called?

Block

What will cause the valve to rise and fall, opening and closing the ports?

Camshaft

Which is larger,, the cmshaft gear or the crankshaft gear? By how much?

Camshaft, 2 times.

Why are sleeved cylinders used?

Aluminum is not strong enough and wears away.

How many times does the crankshaft turn in a complete cycle?

2

Whan are sleeved cylinders used

When the block is made of aluminum