Nissan KR engine

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Nissan KR engine
KR20DDET engine in a 2020 Infiniti QX50
Overview
Manufacturer	Nissan
Production	2018–present
Layout
Configuration	I3 (KR15DDT and KH5T) I4 (KR20DDET)
Displacement	1,461 cc (1.5 L; 89.2 cu in) (KH5T) 1,497 cc (1.5 L; 91.4 cu in) (KR15DDT) 1,997 cc (2.0 L; 121.9 cu in) (KR20DDET)
Cylinder bore	84 mm (3.31 in) (permanent)
Piston stroke	90.1 mm (3.55 in) (8.0:1 compression) 88.9 mm (3.50 in) (14.0:1 compression)
Cylinder block material	Aluminum alloy
Cylinder head material	Aluminum alloy
Valvetrain	DOHC 4 valves per cylinder with VVT
Compression ratio	8.0:1–14.0:1
Combustion
Turbocharger	Yes
Fuel system	Direct-injection (GDI) (KR15DDT) Combined GDI and multi-point indirect injection (KR20DDET)
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	157 hp (159 PS; 117 kW) (KH5T) 201 hp (204 PS; 150 kW) (KR15DDT) 241–268 hp (244–272 PS; 180–200 kW) (KR20DDET)
Torque output	240 N⋅m (177 lb⋅ft) (KH5T) 305 N⋅m (225 lb⋅ft) (KR15DDT) 353–388 N⋅m (260–286 lb⋅ft) (KR20DDET)
Chronology
Predecessor	QR25DE (KR15DDT) (I4) PR25DD (KR15DDT) (I4) VQ35DE (KR20DDET) (V6)

The Nissan KR engine family consists of three and four-cylinder all-aluminum turbocharged gasoline engines in both 12-valve and 16-valve versions with a variable compression ratio and variable valve timing developed by Nissan.

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The KH5T is a 1.5 L (1461 cc) DIG-T (Direct Injection Gasoline-Turbocharged) inline-3 12-valve engine, with a bore x stroke of 79.7 mm × 81.1 mm (3.14 in × 3.19 in).^{[clarification needed]}. Power output is 160 PS (118 kW; 158 hp) and 240 N⋅m (177 lb⋅ft) of torque.The variation in compression ratio ranges between 8:1 and 14:1. This is achieved by the movement of an actuator which changes the length of the piston stroke according to the demand for power.^[1]

Applications:

• 2022–present Nissan Qashqai e-Power 190 PS (140 kW; 187 hp), 330 N⋅m (243 lb⋅ft)

The KR15DDT VC-Turbo 3 cylinder engine is firstly introduced in the fourth-generation X-Trail.^[2] Like the name VC-Turbo suggests, this engine uses a variable compression ratio that allows for high power output and high fuel efficiency at the same time. Due to this, this engine won Nissan the 19th trophy in the Wards 10 Best Engines and Propulsion systems awards of 2022; judge Drew Winter described it as “Very smooth, exceptionally quiet during idle, pleasant to drive in traffic or on the highway”, among other comments from judges such as “This engine inspires words that never have been uttered in the same sentence as 3-cylinder engine”.

Applications:

• 2021–present Nissan Rogue/X-Trail (T33) 201 hp (150 kW; 204 PS) @5600rpm, 225 lb⋅ft (305 N⋅m) @2800rpm

The KR20DDET was announced at the 2016 Paris Motor Show as the VC Turbo which had Nissan's new variable compression technology. The engine was introduced to Nissan's production cars in 2019 in the Infiniti QX50 and the Nissan Altima replacing the previous V6 options.^[3] It was touted as the world's first production-ready variable compression ratio engine.^[4]

Applications:

• 2017–present Infiniti QX50 (J55) 268 hp (200 kW; 272 PS) @5600rpm, 268 hp (200 kW; 272 PS) @4400rpm
• 2021–present Infiniti QX55 (J55) 268 hp (200 kW; 272 PS) @5600rpm, 268 hp (200 kW; 272 PS) @4400rpm
• 2022–present Infiniti QX60 (L51) 268 hp (200 kW; 272 PS), 286 lb⋅ft (388 N⋅m)^[5][6]
• 2023–present Nissan Pathfinder (R53) (China)
• 2019–2024 Nissan Altima (L34) 248 hp (185 kW; 251 PS) @5600rpm, 280 lb⋅ft (380 N⋅m) @1600rpm
• 2024–present Nissan Murano (Z53) 241 hp (180 kW; 244 PS), 260 lb⋅ft (353 N⋅m)

On December 13, 2023, American agency NHTSA opened an investigation into customer complaints of engine failure in the Nissan's KR15DDT and KR20DDET engines, the former being used since the Nissan Rogue update in 2022. The complaints allege engine failure, loss of motive power, engine knock, or noise and/or metal chunks and shavings being found in the oil pan of vehicles with these engines.^[7] The cause appears to be seizures and damages to the main bearings and L-links.^[8] Nissan stated that they are attempting to address these failures by changing their manufacturing process.^[8]

• List of Nissan engines