Nissan MR engine

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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.