In an internal combustion engine, the term indirect injection refers to a fuel injection where fuel is not directly injected into the combustion chamber. Gasoline engines are usually equipped with indirect injection systems, wherein a fuel injector delivers the fuel at some point before the intake valve. A colorized automobile engine The internal combustion engine is a heat engine in which the burning of a fuel occurs in a confined space called a combustion chamber. ... The examples and perspective in this article or section may not represent a worldwide view. ... A combustion chamber is part of an engine in which fuel is burned. ... Fuel injection is a technology used in internal combustion engines to mix the fuel with air prior to combustion. ... A poppet valve is a valve consisting of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. ...

An indirect injection diesel engine delivers fuel into a chamber off the combustion chamber, called a prechamber, where combustion begins and then spreads into the main combustion chamber. The prechamber is carefully designed to ensure adequate mixing of the atomized fuel with the compression-heated air. This has the effect of slowing the rate of combustion, which tends to reduce audible noise. In addition, it softens the shock of combustion and produces lower stresses on the engine components. The addition of a prechamber, however, increases heat loss to the cooling system and thereby lowers engine efficiency. Diesel or diesel fuel is a specific fractional distillate of fuel oil (mostly petroleum) that is used as fuel in a diesel engine invented by German engineer Rudolf Diesel. ... NOiSE is a one volume manga created by Tsutomu Nihei as a prequel to his acclaimed ten-volume work, Blame!. It offers some rather sketchy information concerning the Megastructures origins and initial size, as well as the origins of Silicon life. ... Shock is a serious medical condition where the tissue perfusion is insufficient to meet the required supply of oxygen and nutrients. ...

Aside from the above advantages, early diesels often employed indirect injection in order to use simple, flat-top pistons, and made the positioning of the early, bulky diesel injectors easier. piston + connecting rod Components of a typical, four stroke cycle, DOHC piston engine. ...

Classification of indirect combustion chambers(prechambers)

Swirl chamber

It consists of a sperical chamber located in the cylinder head and separated from the engine cylinder by a tangential throat.About 50% of air enters this swirl chamber during compression stroke of the engine producing a swirl.The products after combustion returns through the same throat to the main cylinder at much higher velocity.So more heat loss to walls of the passage takes place.However this loss can be reduced by providing insulation.Such type of chambers finds application in those engines where fuel control and engine stability is more important than fuel economy.

Precombustion chamber

This chamber is located at the cylinder head and is connected to the engine cylinder by small holes.It occupies 40% of the total cylinder volume.During compressiion stroke air from the main cylinder enters the precombustion chamber.During this moment fuel is injected to the precombustion chamber and combustion takes place.Thus high pressure is released and the fuel droplets are forced through the small holes to the main cylinder resulting in very good mixing of the fuel and air.Thus the bulk of the combustion actually takes place in the main cylinder.This type of combustion chamber has multi-fuel capability because of the temperature of the prechamber

Air cell chamber

Advantages of indirect injection combustion chambers

1. The injection pressure required is low
2. Also the the question of injection direction becomes less importance

Disadvantages

1. Heat plugs are required for pre heating the chambers
2. Specific fuel consumption is high because of heat loss to large exposed areas and pressure loss due to air motion through the throats