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  2. Engine knocking - Wikipedia

    en.wikipedia.org/wiki/Engine_knocking

    Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle. The shock wave creates the characteristic metallic "pinging" sound, and cylinder pressure increases dramatically. Effects of engine knocking range from inconsequential to completely destructive.

  3. Low-speed pre-ignition - Wikipedia

    en.wikipedia.org/wiki/Low-Speed_Pre-Ignition

    LSPI events are random and infrequent, and their effects on impacted vehicles can include very high-pressure spikes, loud knocking noises and sometimes catastrophic engine damage. [4] It's commonly known as "Detonation or Knock". Engine management systems can overcome pre ignition by the means of a knock or detonation sensor.

  4. Pre-ignition - Wikipedia

    en.wikipedia.org/wiki/Pre-ignition

    The reduced engine speeds allow more time for autoignition chemistry to complete thus promoting the possibility of pre-ignition and so called "mega-knock". Under these circumstances, there is still significant debate as to the sources of the pre-ignition event. [3] Pre-ignition and engine knock both sharply increase combustion chamber temperatures.

  5. Antiknock agent - Wikipedia

    en.wikipedia.org/wiki/Antiknock_agent

    Its purpose was to permit high levels of boost pressure in multiple-stage turbochargers, and thus high power at high altitudes, without causing detonation that would destroy the engine. The high pressures brought high temperatures of inlet air, making engines prone to knock. This use and storage stabilization methods were important military ...

  6. General Motors LS-based small-block engine - Wikipedia

    en.wikipedia.org/wiki/General_Motors_LS-based...

    In the early production run of the LS-series engine, some engines encountered 'piston slap' during the first few minutes after a cold engine start; this sound is caused by the pistons rocking slightly in the cylinder until they reach operating temperature/size. "Piston slap" sometimes sounds more like a knock or the sound of a diesel engine ...

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Engine tuning - Wikipedia

    en.wikipedia.org/wiki/Engine_tuning

    Engine tuning is the adjustment or modification of the internal combustion engine or Engine Control Unit (ECU) to yield optimal performance and increase the engine's power output, economy, or durability. These goals may be mutually exclusive; an engine may be de-tuned with respect to output power in exchange for better economy or longer engine ...

  9. Upstart (UPST) Q4 2024 Earnings Call Transcript - AOL

    www.aol.com/upstart-upst-q4-2024-earnings...

    Image source: The Motley Fool. Upstart (NASDAQ: UPST) Q4 2024 Earnings Call Feb 11, 2025, 4:30 p.m. ET. Contents: Prepared Remarks. Questions and Answers. Call ...