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Fuel

Fuel Injector

An electronically controlled valve spraying atomized fuel into the intake port or combustion chamber.

Definition

Injector flow rate and spray pattern must match horsepower and fuel type.

Upgraded injectors are required when adding boost or E85.

Related terms

  • 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.
  • Octane RatingA measure of fuel resistance to knock under compression and heat.
  • 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