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Daimler M 9456

The '''Daimler-Mercedes M 9456''' engine was a supercharged and naturally-aspirated, 6.2-liter and later 6.4-liter, straight-6, internal combustion engine, designed, developed and produced by Daimler Motoren Gesellschaft between 1924 and 1926 for the Mercedes 24/100/140 PS 1924-1926. 
After the merger it was used in Mercedes-Benz 24/100/140 PS in 1926-1928 and Mercedes-Benz 24/100/140 PS Typ 630 from 1928 to 1930. The engine was produced until 1933, but the last years it was only used as a racing engine. 

==M9456 engine==

The six-cylinder in-line 6240 cc engine featured an overhead camshaft which at the time was an unusual feature, with “bevel linkage”. However, it was the switchable Roots-type supercharger (”Kompressor”), adopted from the company's racing cars, that attracted most of the attention.  With the device switched off maximum claimed output was of 100 PS at 3,100 rpm:  with the supercharger operating, maximum output rose to 140 PS

The top speed listed was 115 km/h or 120 km/h depending on which of the two offered final drive ratios was fitted.

From 1928 the Modell K received a still more powerful "Kompressor engine", although there was no change to the overall engine size. Stated power now increased to 110 PS or, with the compressor switched on, 160 PS. The official performance figures were unchanged.


The ''Daimler M 9456'' engine was also offered in a slightly more powerful variant. Here the compression ratio rises to 5:1, while the maximum power (with the compressor engaged) rises to 160 HP. This engine powered the last ''Mercedes-Benz Typ 630'' and ''Typ 630 K'' produced from 1928 to 1929.

The ''Daimler 9456'' engine was replaced by both the M 06 engines and the M 07 engine . The M 9856 engine , also by Daimler, with a cubic capacity of 6.8 liters and used on the first Mercedes-Benz Typ S W06 , was also derived from the ''M 9456'' engine.

== History ==
This engine was one of the first engines produced by Dr. Ferdinand Porsche during his time at DMG. He had arrived a short time earlier to replace Paul Daimler , son of Gottlieb Daimler , another great figure of the pioneering period of the automobile. At the time, Mercedes-Benz did not exist yet, it would only be born in two years' time, but the M 9456 engine would also be used in the production models of the future German brand. Nevertheless, given its conception in the Mercedes and not Mercedes-Benz era, this engine is not considered among the first engines of the new brand, but among the last of the old ones. The same goes for the 4-litre [[Daimler M 836|M 836]]. 


==Applications==
* Mercedes 24/100/140 PS (1924-26)
* Mercedes-Benz Typ 630 (1926-29 ) ;
* Mercedes-Benz Typ 630 Short (1926-28).

==References==
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