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Indirect injection in an internal combustion engine is fuel injection where fuel is not directly injected into the combustion chamber. Gasoline engines equipped with indirect injection systems, wherein a fuel injector delivers the fuel at some point before the intake valve , have mostly fallen out of favor to direct injection .
The fuel is injected only into the pre-chamber (where it begins to combust), and not directly into the main combustion chamber. Therefore, this principle is called indirect injection. There exist several slightly different indirect injection systems that have similar characteristics. [19] Types of indirect injection used by diesel engines include:
It is related (through several evolutions of engine families) to the EA827 series, indirect-injection diesels, 16 valves, and five-cylinder gasoline engines. Naturally aspirated direct-injection variants are known as Suction Diesel Injection, abbreviated to SDI.
Petrol engine with double-barrel carburetor and crossflow valve layout; Petrol engine with multi-point fuel injection with half-spherical combustion chambers and two valves per cylinder (includes also an early 16-valve version of the F-type engine) Diesel engine with indirect injection ; Diesel engine with direct injection
- The number 1 (one) before the number of the engine model means that the engine uses direct injection, otherwise, indirect injection - The F letter after the B letter means that the engine is multivalvular. Since the B family are inline-fours, that means that the engine uses 16 valves. - The T letter, means that the engine is turbocharged
These engines use an injection pump that is entirely mechanical, as was the standard for diesels of the day. The fuel system also utilizes indirect injection which made it quieter than mechanically direct injected engines. Both displacements use the Stanadyne DB-2 injection pump fed by a cam-driven lift pump.
Before electronic fuel injection showed the way forward, European engineers created radically and wonderfully complicated mechanical fuel-injection systems.
Indirect injection, where the fuel is injected into a swirl chamber or pre-combustion chamber. The fuel ignites as it is injected into this chamber and the burning air/fuel mixture spreads into the main combustion chamber. Direct injection engines usually give better fuel economy but indirect injection engines can use a lower grade of fuel.