Editing Indirect injection (section)

====Air cell chamber====
[[File:Acro-Luftspeicher.jpg|thumb|Acro-type injection system, the predecessor of the Lanova, also designed by Franz Lang]]
The air cell is a small cylindrical chamber with a hole in one end. It is mounted more or less coaxially with the injector, said axis being parallel to the piston crown, with the injector firing across a small cavity which is open to the cylinder into the hole in the end of the air cell. The air cell is mounted so as to minimise thermal contact with the mass of the head. A pintle injector with a narrow spray pattern is used. At its top dead centre (TDC) the majority of the charge mass is contained in the cavity and air cell.{{Citation needed|date=October 2008}}

When the injector fires, the jet of fuel enters the air cell and ignites. This results in a jet of flame shooting back out of the air cell directly into the jet of fuel still issuing from the injector. The heat and turbulence give excellent fuel vaporisation and mixing properties. Also, since the majority of the combustion takes place outside the air cell in the cavity, which communicates directly with the cylinder, there is less heat loss involved in transferring the burning charge into the cylinder.

Air cell injection can be considered as a compromise between indirect and direct injection, gaining some of the efficiency advantages of direct injection while retaining the simplicity and ease of development of indirect injection.{{Citation needed|date=October 2008}}

Air cell chambers are commonly named Lanova air chambers.<ref name="google2">{{cite book|title=Troubleshooting and Repairing Diesel Engines|author=Dempsey, P.|date=1995|publisher=TAB Books|isbn=9780070163485|url=https://books.google.com/books?id=5nHW-USbN6wC&pg=PA128|page=128|access-date=8 January 2017}}</ref> The Lanova combustion system was developed by the Lanova company, which was founded in 1929 by Franz Lang, Gotthard Wielich and Albert Wielich.<ref>{{cite journal|title=The Lanova Combustion System|journal=The Commercial Motor|date=6 January 1933|url=http://archive.commercialmotor.com/article/6th-january-1933/38/the-lanova-combustion-system|access-date=11 November 2017}}</ref>

In the US, the Lanova system was used by [[Mack Trucks]]. An example is the Mack-Lanova ED diesel engine fitted to the [[Mack NR]] truck.