Car fuel injection question

[Sharpie]

what is the difference between "Throttle body fuel injection" and "electronic fuel injection" ?

 

[Quixfire]

Throttle Body is similar to a carburetor design; where the injector sits over a throttle plate and injects fuel into a throttle bore.

Electronic Fuel Injection is a broad description for fuel injection systems using an electronic solenoid to control the amount of fuel supplied to the engine.

Fuel Injection

 

There are several types of fuel injection ;

Mechanical
Mechanical electronic
Electronic

Throttle Body <---As Quixfire has explained

Port Fuel Injection <----- Each intake port has a fuel injector that fire continuously.

Sequential port fuel injection <----- Each intake port has a fuel injector that fires as the intake valve begins to open, this is the most efficient.

The new Mercedes and BMW engines now have fuel injection that injects the fuel directly into the combustion chamber.

 

[Pepsi90919]

The new Mercedes and BMW engines now have fuel injection that injects the fuel directly into the combustion chamber.

so where does port (per cylinder) fuel injection go?

 

[DonaldC]

Originally posted by: Pepsi90919

The new Mercedes and BMW engines now have fuel injection that injects the fuel directly into the combustion chamber.

so where does port (per cylinder) fuel injection go?

I believe the port injectors are in the port (runner) before the intake valves. Some M-B and BMW engines only pass air via the intake valve as the injector is positioned to inject directly into the chamber, not the port.

 

[boyRacer]

Originally posted by: Roger

The new Mercedes and BMW engines now have fuel injection that injects the fuel directly into the combustion chamber.

that creates crisper throttle response no?... *sigh* wonder how that feels ... 🙁

 

[Howard]

Originally posted by: boyRacer

Originally posted by: Roger

The new Mercedes and BMW engines now have fuel injection that injects the fuel directly into the combustion chamber.

that creates crisper throttle response no?... *sigh* wonder how that feels ... 🙁

I'd say that the elimination of a throttle valve speeds up response far more than direct injection. Actually, direct injection shouldn't make all that much difference to throttle response.

BTW, Roger, Renault and Mitsubishi have already developed DI engines. Mitsubishi's can run up to 40:1 A/R on low-sulphur fuel.