Both valves are open.
Both valves are closed.
The intake valve is open and the exhaust valve is closed.
The intake valve is closed, while the exhaust valve is open.
Allow “snap acceleration.”
Prevent lateral movement.
Allow lateral movement.
Provides smoother engine operation.
Used to determine the engine revolutions.
Contains a ring gear that is used to start the engine.
Connects the engine crankshaft to the transmission or transaxle.
Both valves within the block.
Both valves within the cylinder head.
The exhaust valve within the cylinder head and the intake valve within the block.
The intake valve within the cylinder head and the exhaust valve within the block.
It condenses injected fuel.
The air and fuel mix becomes a finer mist.
It causes a higher compression level before compression stroke.
It causes the air temperature to rise before compression stroke occurs.
One crankshaft revolution completes a power-producing cycle.
Two strokes complete all four engine events.
Uses reed valves or rotary valves.
Produces less exhaust pollution.
Make the valves heavier to prevent valve bounce.
Make the valves lighter to prevent valve bounce.
Help the valves reach higher temperatures.
Help the valves stay cooler cool.
Umbrella and O-ring.
Neoprene and O-ring.
Umbrella and neoprene.
Neoprene and two-piece lip.
When the valve fails to close entirely.
When the valves remain closed when they should be open.
An abnormal condition that keeps the valve closed too long.
An abnormal condition that allows the valve to open only one-half the proper distance.
For ease in manufacturing.
For proper air/fuel mixture.
Required timing for the valve train.
Them to feed oil to the rocker arms.
A vacuum-advanced camshaft.
Electronically controlled valves.
A continuously variable cam profile.
Electro-hydraulically operated rocker arms.
Wet and dry.
Fine and coarse.
Cast and forged.
Straight and angled.
Cast aluminum alloy.
Forged aluminum alloy.
Independent of the crankshaft.
At half the speed of the crankshaft.
At the same speed as the crankshaft.
At twice the speed of the crankshaft.
Cold temperatures, causing the separation of cetane from the fuel.
Very cold temperatures, causing the separation of wax from the fuel.
Hot temperatures, causing the separation of wax from the fuel.
Very hot temperatures, causing the separation of cetane from the fuel.
Ignites easily from heat and pressure.
Is necessary in hot weather.
Contains more energy.
Liquefied petroleum gas.