ARGH!!!! b*****d!!!
wrote a whole bunch of stuff and now its gone.
Carbs are nowhere near as efficient as injection systems. Firstly carbs rely on the simple fact that fluid travelfrom high pressure to low pressure areas. Carbs use air velocity to create a pressure differential across the main jet circut with chokes and aux venturis etc etc. Then to meter the correct amount of fuel you need to faff about with the correct choke sized and venturi tapers, aux venturis, main jet sizes, air correctors, emulsion tubes. And thats only for the main fueling curcit. And for accleration enrighment you use a simple pump which spurts a set amount of fuel in all the time, not very accurate. When your on part throttle there isnt sufficient air velocity to create the pressure differential needed for the main circut, so you have idle control and progression circuts just so the engine can just roughly keep running....works, but itsnt great.
Injection is far more efficient. The main benefit is from the array of sensors which allow the ECU to deliver precise amounts fo fuel from injectors since their delivery rates are knows aswell. Injection systems are barometrically aware, temp aware, load aware, engine position and speed aware. Couple this with the fact that you can introduce ignition control at the same time means you can create a far better burn ultimately, creating more torque per combustion....so ultimately more power.
Injection systems also have far less in the way of obstructions in the inlet tract from start to finish, less to create turbulance and remain closer to true isentropic flow. Thus you can run a smaller body bore to attain the same power, leading to better low rpm cyliner filling as less energy us removed from velocity int eh creation of velocity.
Inection will always make more torque and power than carbs, providing they are of the same setup i.e. individual runners or a plenham.
Put simply....injection systems know whats going on, carbs dont.
