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Modern knock control-loop systems are able to adjust ignition timings for every cylinder individually. Depending on the specific engine the boost pressure is regulated simultaneously. This way performance is kept at its optimum while mostly eliminating the risk of engine damage caused by knock (e.g. when running on low octane fuel). [5]
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.
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.
Leaking of the up-pipes causes the engine to lose boost and cause exhaust gas temperatures to increase. The EBPV exhaust back-pressure valve (EBPV) was also prone to failure; it could close when cold and get stuck on causing a jet engine like noise coming from the exhaust.
The torsional deflection of a simple cylinder cannot radiate efficiently acoustic noise, but with particular boundary conditions the stator can radiate acoustic noise under torque ripple excitation. [8] Structure-borne noise can also be generated by torque ripple when rotor shaft line vibrations propagate to the frame [9] and shaft line.
Image source: The Motley Fool. Nvidia (NASDAQ: NVDA) Q4 2025 Earnings Call Feb 26, 2025, 5:00 p.m. ET. Contents: Prepared Remarks. Questions and Answers. Call ...
He plans to drop in a fuel-injected V-8 engine at some point, but these days Osborn, whose tattoos tend toward the nautical, is spending much of his time trying to convince working-class ...
Engine balance refers to how the inertial forces produced by moving parts in an internal combustion engine or steam engine are neutralised with counterweights and balance shafts, to prevent unpleasant and potentially damaging vibration. The strongest inertial forces occur at crankshaft speed (first-order forces) and balance is mandatory, while ...
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