An octane rating, or octane number, is a standard measure of a fuel 's ability to withstand compression in an internal combustion engine without causing engine knocking.

Nov 17, 2022 · The octane number is actually the simple average of two different octane rating methods— motor octane rating (MOR) and research octane rating (RON)—that differ primarily …

Dec 12, 2025 · octane number, measure of the ability of a fuel to resist knocking when ignited in a mixture with air in the cylinder of an internal-combustion engine.

Octane rating is the measure of a fuel's ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating prematurely in the engine. In the U.S., unleaded …

Jan 9, 2025 · This value, known as the Anti-Knock Index (AKI), is indicates the octane in gasoline that consumers see on fuel dispensers. The different grades are related to the types of vehicle …

Feb 2, 2025 · Octane is a hydrocarbon added to gasoline to control how easily the fuel ignites and burns under pressure. The octane number indicates the fuel’s resistance to premature ignition. …

Jul 30, 2025 · The Research Octane Number (RON) serves as a widely accepted metric for determining fuel octane ratings. RON testing is conducted under mild operating conditions to …

Feb 21, 2024 · It's a hydrocarbon molecule that gives gasoline the ability to resist detonating prematurely in the engine, which causes engine knocking or pinging during combustion. An …

Dec 23, 2025 · Octane ratings derive from the Research Octane Number (RON), Motor Octane Number (MON), and the mean of both, expressed as (R+M/2). In the United States, the octane …

The octane requirement of an engine varies with compression ratio, geometrical and mechanical considerations, and operating conditions. The higher the octane number, the greater the fuel’s …