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Fuel

Carburetor

A mechanical device mixing fuel and air using jets, venturis, and throttle plates.

Definition

Carburetors remain common on classic and race engines without electronic fuel injection.

Tuning involves jetting, idle circuit, and accelerator pump calibration.

Related terms

  • Fuel InjectorAn electronically controlled valve spraying atomized fuel into the intake port o
  • 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