BEELD. De beestachtige 421 pk viercilinder van Mercedes-AMG

Mercedes-AMG lanceert binnenkort een nieuwe A45 (S), voor de fans van kleine extreme Benzen. Om de introductie luister bij te zetten is het al zeer potente motorblok nóg krachtiger gemaakt. De Duitsers zetten de krachtbron alvast in de schijnwerpers.
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Mercedes heeft met de huidige generatie A45 AMG al een motor die zijn gelijke niet kent. De tweeliter turbo produceert 381 pk, waarmee deze het hoogste specifieke vermogen van alle in serie geproduceerde tweelitermotoren op de markt heeft. Voor de opvolger werd er nog een scjhepje bovenop gedaan: de M133-motor werd doorontwikkeld tot M139, die 387 pk/475 Nm of 421 pk/500 Nm (S-versie) uit zijn bescheiden inhoud van 1.991 cc trekt. De motor - voorzien van één twinscroll-turbo met rollager-compressor en turbinewielen - heeft een turbodruk van respectievelijk 1,9 en 2,1 bar, en weegt 160,5 kg.

Mercedes plaatste de injectiemonden en het bougiesysteem in de cilinderkop op een andere plek en onder een kleine hoek te plaatsten, waardoor de uitlaatkleppen veel groter gemaakt konden worden dan bij de vorige motor. Daarnaast is de motor voorzien van variabele klepbediening CAMTRONIC aan de uitlaatzijde, met twee nokken per klep. Deze hebben een verschillende geometrie zodat de uitlaatkleppen, afhankelijk van de nokinstelling die het beste past bij de rijomstandigheden, kort of lang kunnen worden geopend. Dit zorgt voor een betere respons bij lage toerentallen, zuinig en comfortabel rijden bij middelhoge toerentallen en een volledige vermogensafgifte in het hoge toerenbereik.

De Duitsers stuurden een serie foto's van de motor de wereld in, wanneer we de auto eromheen te zien krijgen is nog niet bekend.

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