Definition
Higher octane allows more timing advance and boost on tuned engines.
Using the minimum octane your tune requires avoids detonation damage.
Related terms
- Fuel InjectorAn electronically controlled valve spraying atomized fuel into the intake port o…
- CarburetorA mechanical device mixing fuel and air using jets, venturis, and throttle plate…
- Direct InjectionFuel injection directly into the combustion chamber at high pressure.
- Port InjectionFuel sprayed into the intake port before the valve, mixing with incoming air.
- E85A blend of roughly 85% ethanol and 15% gasoline offering high knock resistance.
- Air-Fuel RatioThe mass ratio of air to fuel in the intake charge, critical for power and engin…
Category: Fuel · Updated August 31, 2026