Knock Detection
Due to the large variation in fuel quality, a large number of engines now contain mechanisms to detect knocking and adjust timing or boost pressure accordingly in order to offer improved performance on high octane fuels while reducing the risk of engine damage caused by knock while running on low octane fuels.
An early example of this is in turbo charged Saab H engines, where a system called Automatic Performance Control was used to reduce boost pressure if it caused the engine to knock.
Various monitoring devices are commonly utilized by tuners as a method of seeing and listening to the engine in order to ascertain if a tuned vehicle is safe under load or used to re-tune a vehicle safely.
Read more about this topic: Engine Knocking
Famous quotes containing the word knock:
“However much you knock at nature’s door, she will never answer you in comprehensible words.”
—Ivan Sergeevich Turgenev (1818–1883)