|
Typical fuel injection system uses pressure from an electric fuel pump to provide fuel. A carburetor uses engine vacuum to draw fuel into the engine. Fuel injections gains its advantages in allowing an improved atomization (fuel is being sprayed into the intake manifold under pressure) which will help bring the fuel in as a fine mist. Better atomization improves fuel distribution into each cylinder and more efficient combustion of the fuel. This leads to many advantages over a carburetor. Better fuel economy due to more precise fuel metering, distribution, atomization. Emissions can be maintained better since you can run a lean air-fuel mixture [a mixture greater than stoichiometric: 14.7:1, for instance: 20(air):1(fuel)]ensuring a better percentage of fuel is burned. Cold weather drivability is improved. And the biggie, an overall increase in engine power. Of coarse having a proper engine setup will increase the efficiency. Engine setups such as lean burn engines use correctly shaped pistons paired with correctly located intake manifolds to generate more swirl in the combustion chamber. This process allows the fuel to mix even better increasing air-fuel ratios as high and 25:1. Multi-valve engines also improve this process. Then you also have direct injection systems where fuel is injected directly into the combustion chamber under high pressure prior to ignition allowing an even more precise control the the charge.
|