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Octane


Octane is the number that indicates the anti-knock quality of the gasoline.

  • The higher the octane number, the more resistant the gasoline is to knock. A  93 octane gasoline is more knock-resistant than an 89 octane gasoline. Thus, gasoline that detonates easily is classified as low octane gasoline. Gasoline that resists detonation is a high octane gasoline
  • The octane rating for any gasoline is determined by testing it in a laboratory engine. The test results are used to calculate the minimum octane rating. This is the number displayed on the pumps at gas stations
  • High Compression engines require high octane gasoline. Compression ratio is a measure of how much the air-fuel mixture is compressed on the compression stroke. High compression ratios are desirable because higher compression engines can produce morestroke. High compression ratios are desirable because higher compression engines can produce more power