Aici au cedat doua clapete in acelasi timp...deci , mai mult ca sigur avea probleme pe partea de actionare a clapetelor, fie din cauza jegului fie din cauza vacuumului... dubioasa insa pozitia pistoanelor...toate jos..!? :) http://i214.photobucket.com/albums/cc209/3wheeler8/italianjob-2.jpg ceva din modul de functionare.. http://i76.photobucket.com/albums/j35/Peterflux/BMWSwirlControl.jpg BMW AG BMW Diesel.... 12th DEER Conference, August 20-24, 2006, Detroit Combustion Chamber Configuration. Left Figure: 6-Cylinder Right Figure: 8-Cylinder Part of the package for EU 4 emission regulations. - Central injector position - 4 valves - Symetrical combustion chamber - Variable air control http://i76.photobucket.com/albums/j35/Peterflux/DieselSwirlControl.jpg If you read up on the technical reasons... basically for improved torque in the lower rev range and emissions control, typically below about 2,300rpm. As autos work more in the lower rev range makes sense why the 6-pot autos have them. Petrol engines also have swirl control, (emission based) it does improve combustion. Don't go down any odd road of obscure reasoning, they are there to meet emission targets. And improve running. FACT.