Editing Variable displacement (section)

===Alfa Romeo Alfetta CEM===
In 1981 [[Alfa Romeo]] developed in collaboration with the [[University of Genoa]] a semi-experimental variable displacement engine version of the [[Alfa Romeo Alfetta]], called Alfetta CEM (''Controllo Elettronico del Motore'', or Electronic Engine Management), and showed it at the [[Frankfurt Motor Show]].<ref name="lastampa CEM83" /> The {{convert|130|PS|kW bhp|0|abbr=on}} 2.0-litre modular engine featured [[fuel injection]] and [[Ignition system|ignition]] systems governed by an engine control unit, which could shut off two of four cylinders as needed in order to reduce fuel consumption. An initial batch of 10 examples were assigned to [[taxi]] drivers in Milan, to verify operation and performance in real-world situations.<ref name="lastampa CEM83">{{cite news |url=http://www.archiviolastampa.it/component/option,com_lastampa/task,search/mod,libera/action,viewer/Itemid,3/page,17/articleid,1026_01_1983_0088_0017_14332568/ |title=L'Alfa riduce i consumi "staccando" i cilindri |first=Vittorio |last=Sabadin |date=15 April 1983 |page=25 |newspaper=[[La Stampa]] |language=IT |access-date=6 March 2015}}</ref><ref name="lastampa CEM82">{{cite news |url=http://www.archiviolastampa.it/component/option,com_lastampa/task,search/mod,libera/action,viewer/Itemid,3/page,19/articleid,1039_01_1982_0094_0019_14861492/ |title=Alfa, il motore modulare per contenere i consumi |first=Michele |last=Fenu |date=7 May 1982 |page=19 |newspaper=[[La Stampa]] |language=IT |access-date=6 March 2015}}</ref> According to Alfa Romeo during these tests cylinder deactivation was found to reduce fuel consumption by 12% in comparison to a CEM fuel-injected engine without variable displacement, and almost by 25% in comparison to the regular production [[Carburettor|carburetted]] 2.0-litre.<ref name="lastampa CEM82" /> After the first trial, in 1983 a small series of 1000 examples was put on sale, offered to selected clients;<ref name="lastampa CEM83" /> 991 examples were produced. Despite this second experimental phase, the project had no further developments.