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| Renault-Nissan MR engine | |
|---|---|
 MR20DE | |
| Overview | |
| Manufacturer | Nissan Motors and Renault |
| Production | 2004–present |
| Layout | |
| Configuration | Inline 4 |
| Displacement | 1.6 L (1618 cc) 1.8 L (1798 cc) 2.0 L (1997 cc) |
| Cylinder bore | 79.7 mm (3.14 in) 84 mm (3.31 in) |
| Piston stroke | 81.1 mm (3.19 in) 90.1 mm (3.55 in) |
| Cylinder block material | Aluminum alloy |
| Cylinder head material | Aluminum alloy |
| Valvetrain | DOHC 4 valves x cyl. with VVT |
| Compression ratio | 9.5:1, 9.9:1 |
| Combustion | |
| Turbocharger | In some versions |
| Fuel system | Fuel injection Direct injection |
| Fuel type | Gasoline (all except M9R / M9T) Diesel (M9R / M9T) |
| Cooling system | Water-cooled |
| Output | |
| Power output | 122–300 bhp (124–304 PS; 91–224 kW) |
| Torque output | 174–285 N⋅m (128–210 lb⋅ft) |
| Chronology | |
| Predecessor | Nissan SR engine
Renault F-Type engine |
The Renault-Nissan MR engine family consists of straight-four 16-valve all-aluminium and water cooled automobile engines with variable valve timing co-developed by Renault and Nissan. Renault calls it the M engine. Other noteworthy features of this engine family include acoustically equal runner lengths and a tumble control valve for the intake manifold, a "silent" timing chain, mirror finished crankshaft and camshaft journals, and offset cylinder placement in an attempt for increased efficiency.
The MR engine family features 'under stress' manufacture, meaning while the block is being bored, a torque plate puts the block under stress. The block becomes temporarily distorted until the head is torqued onto it, at which point the block is pulled into the correct shape.