Economy is probably the last on your mind when you deiced you want a Mercedes Benz S-Class. You probably think of the V8 model, or even one of those awesome AMG variants. But Mercedes, being a sensible car maker offers the car with a V6 as well. Now though, they’ve gone one step further and offer this big and luxurious car with a four-cylinder DIESEL engine! With average fuel consumption of 5.7 litres per 100 kilometres, the S250 CDI is “the world’s most economical luxury saloon”.
The first four-cylinder engine in the more than 60-year success story of the S-Class is also the the first car in the luxury segment to run on under 6 litres of fuel per 100 km. It also has low emissions at 149 grammes of per kilometre.
The 2.2-litre CDI engine benefits from two-stage turbocharging which makes it capable of a peak power output of 150 kW (204 hp) and maximum torque of 500 Newton metres. It accelerates the large saloon from 0 to 100 km/h in 8.2 seconds, and attains a top speed of 240 km/h.
The compact module for the two-stage turbocharger consists of a small high-pressure (HP) turbocharger and a large low-pressure (LP) turbocharger.These are connected in series, and each has a turbine and a compressor driven by this turbine. The HP turbine is located directly at the exhaust manifold and initially allows exhaust gas to flow through it; it then rotates at up to 215,000 revolutions per minute. The HP turbine housing features an integral bypass duct, which can be opened or closed by means of a charge-pressure control flap triggered by a vacuum cell. If the flap is closed, the whole exhaust stream flows through the HP turbine, so that the exhaust-gas energy is available solely for the HP turbine drive. This means that the optimum charge pressure can be built up at low engine revs.
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Cylinder number/arrangement
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4/in-line
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Displacement (cc)
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2143
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Bore (mm)
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83
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Stroke (mm)
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99
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Compression ratio
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16.2 : 1
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Output (kW at rpm)
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150 at 4200 rpm
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Torque (Nm at rpm)
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500 at 1600-1800 rpm
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2010 Mercedes S250 CDI BlueEFFICIENCY is priced form 71,876 Euros.
Oggi è di tendenza il downsizing in campo motoristico. E forse è una scelta pure intelligente, in un’epoca di crisi economica che lambisce un pò tutti. E il fenomeno interessa pure il settore del lusso, dove anche lì, se è possibile risparmiare qualcosa, perchè non approfittarne? In quest’ottica si inserisce la nuova Mercedes S 250 Cdi. Un buon 4 cilindri tecnologicamente valido e di cubatura relativamente ridotta pùò funzionare pure sotto una ammiraglia di alto livello come la Classe S. Avrà successo questa versione? Secondo me, premesso che la tecnologia e le buone prestazioni ci sono, tutto dipenderà dal prezzo di vendita. Solo se il risparmio rispetto alla versione di accesso a 6 cilindri di 3.000 cc diesel sarà considerevole, una tale motorizzazione “ridotta” avrà senso. Altrimenti l’acquirente preferirà la sicurezza della motorizzazione più grande e più esclusiva!
BUON NATALE e FELICE ANNO NUOVO 2011!!!