Air & Fuel Delivery

How Do Air and Fuel Delivery Parts Work Together?

Air and fuel delivery parts work together by pulling air into the engine and mixing it with the right amount of fuel. If one component can't keep up, the rest of the system can't make the power it was built for.

Most systems rely on four groups of parts:

• Intake parts filter incoming air and route it to each cylinder.
• Metering parts mix fuel into that air at the correct ratio.
• Supply parts store, pressurize and clean fuel before it reaches the engine.
• Compliance parts, such as emission components, control fuel vapors and exhaust output on street vehicles.

Plan your upgrades as a package. A larger intake or power adder needs more fuel, and a bigger fuel system needs enough airflow to use it. Edelbrock builds parts for the intake, fuel and power-adder sides of the system, so you can source matched components from one brand.

Should You Run a Carburetor or an EFI Conversion Kit?

Choose a carburetor if you want a simple, mechanical setup you can tune with jets and springs. Choose fuel injection if you want easier cold starts, a steadier idle and automatic adjustment for altitude and temperature.

Our carburetors and accessories include complete units, rebuild kits, jets and spacers from brands like Holley and Quick Fuel. Carburetors stay popular for classic restorations, bracket racing and budget-minded builds. They're also easy to service at the track with basic hand tools.

Self-learning throttle-body kits from FiTech bolt to a standard four-barrel flange and adjust fuel delivery as you drive. Most EFI swaps also need a higher-pressure pump and a return-style or regulated fuel line, so budget for the supply side too. Compare fuel injection systems and EFI conversion kits, and read our carburetor vs. fuel injection guide for cost and tuning differences.

How Do You Choose Fuel Pumps, Regulators, Filters and Fuel Cells?

Match fuel pump flow to your horsepower goal and fuel type, then pick a regulator and filter that support that flow. Pumps are rated by volume at a given pressure, so compare ratings at the pressure your carburetor or injection system uses.

Fuel type changes the math. E85 and methanol need more fuel volume than gasoline to make the same power. They call for a larger pump and alcohol-compatible lines, seals and filters.

Our fuel pumps, regulators and filters cover mechanical, in-line electric and in-tank designs, including high-flow options from Aeromotive. Before you choose, read our guide to performance fuel pumps for carbureted and racing engines.

Upgraded fuel tanks and fuel cells let you add baffling, a sump or an in-tank pump. If you race, check your sanctioning body's rulebook, since many classes require a certified fuel cell.

What Do Cold Air Kits, Intake Manifolds and Throttle Linkage Change?

Air intake upgrades help your engine breathe cooler, denser air and deliver it evenly to each cylinder. Our air filters and cold air kits, including options from K&N, replace restrictive factory airboxes with smoother tubes and high-flow filters. Gains depend on your engine and tune, and our article on how much horsepower a cold air intake adds explains what to expect.

Swapping intake manifolds changes where your engine makes power. Dual-plane designs usually favor low-end torque for street driving, while single-plane designs move power higher in the RPM range. Brands like FAST offer manifolds designed for LS engines.

Don't overlook throttle cables and linkage when you change carburetors, throttle bodies or manifolds. Correct geometry gives you full throttle opening and a smooth return to idle. If you run an automatic, make sure the kickdown or TV cable still lines up.

When Should You Add a Supercharger, Turbocharger or Nitrous?

Add a power adder when your engine's natural airflow can't reach your horsepower goal and you're ready to upgrade the fuel system to match. Each type delivers power differently, so choose based on how you drive. Every option raises cylinder pressure, so plan for fuel, ignition and tuning upgrades.

Our superchargers and turbochargers force more air into the engine. Centrifugal units from Vortech and ProCharger build boost with engine speed, while positive-displacement units like the Edelbrock E-Force deliver strong low-end torque. Our supercharger buying guide walks you through drive types and sizing.

For on-demand power, kits from Nitrous Express and other nitrous oxide systems add power only when you activate them. Wet kits add fuel with the nitrous, while dry kits rely on the injectors for extra fuel. Truck owners can find turbo, injection and intake upgrades in our diesel performance products.