four stroke engines

Question 1

piston

Answer 1

moving metal component. seals the enclosed volume in a cylinder, moves up and down inside the cylinder. Transmits power from combustion, drives the crankshaft

Question 2

crankshaft

Answer 2

translates piston movement into rotational work output. via connecting rod

Question 3

camshaft

Answer 3

controls valve timing. intake and exhaust. driven by crankshaft. connected by gear or timing chain

Question 4

intake valve

Answer 4

allows fresh air in. resets combustion cyclee

Question 5

exhaust valve

Answer 5

allows exhaust gases out. after combustion

Question 6

pushrods

Answer 6

translates rotational motion into linear motion

Question 7

fuel injector

Answer 7

injects fuel into the cylinder for combustion. diesel has NO spark plug. Gas requires spark plug

Question 8

flash point

Answer 8

temperature at which a fuel CAN BE MADE to ignite. requires an outside source of ignition

Question 9

auto-ignition temperature

Answer 9

temperature above the flash point. fuel in oxygen WILL ignite. requires NO outside ignition source

Question 10

intake stroke

Answer 10

piston moves from the top of the cylinder to bottom. intake valve opens at the start of the down stroke drawing fresh air in. intake valve shuts at the end of the intake stroke, cylinder volume is at max

Question 11

compression stroke

Answer 11

piston reverses direction. pressure and temp increase as the piston moves upward

Question 12

power stroke

Answer 12

fuel is added to the hot compressed air . cylinder is pushed downward by the combustion force

Question 13

exhaust stroke

Answer 13

piston moves upwards. exhaust valve opens, combustion gases expelled. exhaust valve shuts completing the cycle

Question 14

throttle body

Answer 14

opens to let more air or less air into the cylinder. More fuel and air = faster engine speed
LESS fuel and air = SLOWER engine speedco

Question 15

combustion

Answer 15

chemical reaction between fuel and oxygen, air fuel and heat required