Nissan MR engine

Renault-Nissan MR engine
MR20DE
Overview
ManufacturerNissan Motors and Renault
Production2004–present
Layout
ConfigurationInline 4
Displacement1.6 L (1618 cc)
1.8 L (1798 cc)
2.0 L (1997 cc)
Cylinder bore79.7 mm (3.14 in)
84 mm (3.31 in)
Piston stroke81.1 mm (3.19 in)
90.1 mm (3.55 in)
Cylinder block materialAluminum alloy
Cylinder head materialAluminum alloy
ValvetrainDOHC 4 valves x cyl. with VVT
Compression ratio9.5:1, 9.9:1
Combustion
TurbochargerIn some versions
Fuel systemFuel injection
Direct injection
Fuel typeGasoline (all except M9R / M9T)
Diesel (M9R / M9T)
Cooling systemWater-cooled
Output
Power output122–300 bhp (124–304 PS; 91–224 kW)
Torque output174–285 N⋅m (128–210 lb⋅ft)
Chronology
PredecessorNissan SR engine
Renault F-Type engine
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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.