Talk:Mercedes-Benz M180 engine
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- ===Mid-sized six-cylinder head design===
This section possibly contains original research. (February 2015)- The mid-sized six carries over the 1951 190SL's four-cylinder SOHC general design, with non-cross-flow (reverse-flow) ports all located on one side of the head casting.
- The combustion chamber design is very similar to the pre-WW2 Chevrolet "Blue Flame" OHV six-cylinder, with a "dog leg" L-shaped chamber. The exhaust valve is deeply recessed in a pocket containing most of the chamber volume, and the much longer intake valve is nearly flush with the deck surface. This design of inlet tract, with the large valve opening directly into the cylinder from an individual, semi-downdraught port, provides excellent gas flow resulting in the high volumetric efficiencies of these engines (157 and 158 BMEP from the 2.2L and 2.8L fuel injected versions)