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  2. Engine knocking - Wikipedia

    en.wikipedia.org/wiki/Engine_knocking

    In spark-ignition internal combustion engines, knocking (also knock, detonation, spark knock, pinging or pinking) occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but when one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.

  3. Pre-ignition - Wikipedia

    en.wikipedia.org/wiki/Pre-ignition

    Pre-ignition is initiated by an ignition source other than the spark, such as hot spots in the combustion chamber, a spark plug that runs too hot for the application, or carbonaceous deposits in the combustion chamber heated to incandescence by previous engine combustion events.

  4. Ignition timing - Wikipedia

    en.wikipedia.org/wiki/Ignition_timing

    Pressure in cylinder pattern in dependence on ignition timing: (a) - misfire, (b) too soon, (c) optimal, (d) too late. In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke.

  5. Back-fire - Wikipedia

    en.wikipedia.org/wiki/Back-fire

    Common causes of backfire are running rich (too much fuel going into cylinders) or faulty ignition, possibly a fouled (dirty) spark plug, coil, or plug wire. Pop-backs are usually caused by problems with timing. If the timing is too early, the spark plug fires before the intake valves close, causing the combustion to propagate into the intake ...

  6. Wasted spark system - Wikipedia

    en.wikipedia.org/wiki/Wasted_spark_system

    A wasted spark system is a type of ignition system used in some four-stroke cycle internal combustion engines. In a wasted spark system, the spark plugs fire in pairs, with one plug in a cylinder on its compression stroke and the other plug in a cylinder on its exhaust stroke. The extra spark during the exhaust stroke has no effect and is thus ...

  7. College football games today: How to watch, stream Saturday's ...

    www.aol.com/college-football-games-today-watch...

    With CFP positioning on the line in many of these games, here is how to watch all of the action today that will shape the playoff.

  8. 34 Unique Things to Do on New Year's Eve to Ring in 2025 - AOL

    www.aol.com/25-unique-things-years-eve-204800916...

    The best ideas for things to do on New Year's Eve 2024, including fun ways to celebrate at home and inspiring New Year's activities for any age or group size.

  9. Kate Middleton makes rare remarks about her challenging year ...

    www.aol.com/kate-middleton-makes-rare-remarks...

    Catherine, Princess of Wales, offered a rare reflection on her cancer journey during an interaction at her annual carol service, “Together At Christmas.”. Kate hos t ed t he fourth annual ...