Automobile ignition systems rely on perfect timing. A simple spark, when delivered at precisely the right moment, can mean the difference between a smoothly running, powerful engine that operates cleanly and an engine that runs rough, lacks power and produces unnecessary emissions. Let's get your motor running.
For an engine to make the best use of the fuel, the spark should occur before the piston reaches the top of what?
the intake stroke
the compression stroke
the exhaust stroke
The speed of the pistons increases as the engine speed increases. This means that the faster the engine goes, the spark has to occur when?
No change is necessary.
What is it called when the spark timing is moved closer to the top of the compression stroke?
retarding the spark
advancing the spark
promoting the spark
According to the article, retarding the timing may also eliminate what?
What is the difference between a "hot" spark plug and a "cold" spark plug?
the lack of a copper gasket
the length of the center electrode
the shape of the ceramic tip
The coil is a simple device -- essentially a high-voltage transformer made up of ______ of wire.
a single coil
The primary role of the distributor is to distribute high voltage from the ______ to the correct cylinder.
Spark plugs use this to isolate the high voltage at the electrode, ensuring that the spark happens at the tip of the electrode and not anywhere else on the plug.
a ceramic insert
a copper gasket
Spark timing is so critical to an engine's performance that most modern cars use a sensor to tell the engine control unit (ECU) what?
the exact temperature of the spark plugs
the exact position of the pistons
the exact location of the coil
In a distributorless ignition system, what component has total control over spark timing?