Have you ever heard a sharp 'chattering' or rattling sound from your car engine upon accelerating up a hill or steep incline?
Chances are, what you heard was 'knocking' or abnormal combustion. This occurs when the fuel inside the combustion chamber ignites uncontrollably, causing a knocking or pinging sound. It usually only lasts for a while but it can be harmful to your engine in the long run.
The fuel octane level required by a brand new engine is determined by its manufacturer. The engine's octane number requirement (ONR) generally increases as combustion chamber deposits form during the first several thousand kilometers of operation. If the octane appetite of an engine is higher than the octane of the fuel being used, knocking occurs. Since sustained knocking is harmful to an engine, modern cars are fitted with devices called knock sensors (designed to detect knock, often even before the driver does).
A knock sensor is designed to detect knock, often even before the driver does. Upon sensing knocking or pinging, the engine's computer control system adjusts the engine's operation by retarding the spark timing to avoid the knock. These adjustments can reduce power and acceleration, particularly during heavy throttle, just when you need power the most!
Research shows that precursors for combustion chamber deposits can come from the fuel, lower quality fuel additives, and the engine oil.
Excessive combustion chamber deposits can promote knock, they can also suppress your engine's full potential by contributing to more frequent knock sensor-induced ignition timing retardation. Caltex with Techron® is proven at cleaning vital engine parts. Its unique design helps minimise the contribution to harmful combustion chamber deposits, helping your engine maintain maximum performance.