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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.
This causes an incomplete burn which causes the fumes to explode in the exhaust system along with an audible pop or bang sound. This is a result of working equipment, and is unlikely to cause damage. A fuel-injected engine may backfire if an intake leak is present (causing the engine to run lean), or a fuel injection component such as an air ...
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 December – Russian Air Force Antonov An-124 Ruslan, RA-82005, delivering two Sukhoi Su-27 Flankers to Vietnam, lost power in both port engines at 200 feet (60 m) on take-off from Irkutsk and crashed into a residential area, killing eight crew, 15 passengers, and 45 on the ground (some accounts list higher ground casualties). The cause was ...
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.
Human Rights Watch (HRW) said on Sunday that evidence suggested a misfired rocket was the likely cause of an explosion that resulted in heavy casualties at a hospital in Gaza on Oct. 17.
Smoking can cause damage to blood vessels, making it a major risk factor for heart disease. Combined with other heart disease risk factors, such as type 2 diabetes or high blood pressure, smoking ...
Catastrophic engine failure was found to be the cause. [139] June United States Air Force 1st Lt. Kurt D. Schwindt and 2nd Lt. Craig R. Martelle were killed when their Cessna Skymaster O-2 Forward Control aircraft crashed at Travis Field near Savannah, Georgia, during the "Quick-Thrust" joint exercise. Investigators determined that a tail-flap ...