EFI = Electronic Fuel Injection
Carburetors have been around for ever. This is a device that delivers the amount of fuel an engine needs in relation to the amount of air that is pushed through it by atmospheric pressure. When tuned properly for atmospheric and weather conditions, carburetors work very well.
There are many types of Electronic Fuel Injection on the market today. I will cover the 3 major types; Throttle Body Injection, Port Fuel Injection, and Direct Fuel Injection. All of these systems are controlled by very similar computer systems and related sensors.
Throttle Body Injection is the most simple type of EFI and the closest to carburetion in operation. Fuel is injected above the throttle blades by one or more fuel injector nozzles. Both fuel and air are carried throughout the entire intake tract.
Port Fuel Injection Fuel is injected at each intake port, usually at the cylinder head and intake manifold. Only air travels through the intake tract until it reaches the point in which fuel is injected. This method allows a wide variety of intake system designs to be explored and utilized depending on application, thus making super- and turbo-charging extremely feasible.
Direct Fuel Injection This system utilizes injectors similar to diesel engines in which fuel is injected directly into the cylinder.
Some pros and cons of the two systems
Carbs - EFI
Winter Drivability: Poor - Excellent
Summer Drivebility: Excellent - Excellent
Skill Level Required: Average - Advanced
Initial Cost: $200+ - $1000+
Long-term cost: High - Manageable
Performance: Good - Better
Turbo-compatible: Poor - Excellent
Supercharger-compatible: Depends - Excellent
N2O-compatible: Good - Good
Emissions Friendly: Poor - Excellent
"Wow" Factor: Fair - Excellent
Reliability: Good - Excellent
Fuel Distribution: Fair - Excellent
Intake Configurations: Limited - Unlimited
You can decide for yourself which is better
Carburetors have been around for ever. This is a device that delivers the amount of fuel an engine needs in relation to the amount of air that is pushed through it by atmospheric pressure. When tuned properly for atmospheric and weather conditions, carburetors work very well.
There are many types of Electronic Fuel Injection on the market today. I will cover the 3 major types; Throttle Body Injection, Port Fuel Injection, and Direct Fuel Injection. All of these systems are controlled by very similar computer systems and related sensors.
Throttle Body Injection is the most simple type of EFI and the closest to carburetion in operation. Fuel is injected above the throttle blades by one or more fuel injector nozzles. Both fuel and air are carried throughout the entire intake tract.
Port Fuel Injection Fuel is injected at each intake port, usually at the cylinder head and intake manifold. Only air travels through the intake tract until it reaches the point in which fuel is injected. This method allows a wide variety of intake system designs to be explored and utilized depending on application, thus making super- and turbo-charging extremely feasible.
Direct Fuel Injection This system utilizes injectors similar to diesel engines in which fuel is injected directly into the cylinder.
Some pros and cons of the two systems
Carbs - EFI
Winter Drivability: Poor - Excellent
Summer Drivebility: Excellent - Excellent
Skill Level Required: Average - Advanced
Initial Cost: $200+ - $1000+
Long-term cost: High - Manageable
Performance: Good - Better
Turbo-compatible: Poor - Excellent
Supercharger-compatible: Depends - Excellent
N2O-compatible: Good - Good
Emissions Friendly: Poor - Excellent
"Wow" Factor: Fair - Excellent
Reliability: Good - Excellent
Fuel Distribution: Fair - Excellent
Intake Configurations: Limited - Unlimited
You can decide for yourself which is better
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