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| Nissan KR engine | |
|---|---|
 KR20DDET engine in a 2020Infiniti QX50 | |
| Overview | |
| Manufacturer | Nissan |
| Production | 2018–present |
| Layout | |
| Configuration | |
| Displacement | |
| Cylinder bore | 84 mm (3.31 in) (permanent) |
| Piston stroke |
|
| Cylinder block material | Aluminum alloy |
| Cylinder head material | Aluminum alloy |
| Valvetrain | DOHC4 valves per cylinder withVVT |
| Compression ratio | 8.0:1–14.0:1 |
| Combustion | |
| Turbocharger | Yes |
| Fuel system |
|
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | |
| Torque output | |
| Chronology | |
| Predecessor | |
TheNissan KR engine family consists ofthree andfour-cylinder all-aluminiumturbochargedgasoline engines in both12-valve and16-valve versions with avariable compression ratio andvariable valve timing developed byNissan.
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TheKH5T is a 1.5 L (1461 cc) DIG-T (Direct Injection Gasoline-Turbocharged)inline-312-valve engine, with abore xstroke 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:
The KR15DDT VC-Turbo 3 cylinder engine was introduced in thefourth-generation X-Trail.[2] The "VC" designation in the name indicates that the engine uses avariable compression ratio, allowing operating modes modes for both high power output and high fuel efficiency. The engine won Nissan its 19th trophy in theWards 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:
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The KR20DDET was announced at the2016 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:
On December 13, 2023, American agencyNHTSA opened an investigation into customer complaints of engine failure in the Nissan'sKR15DDT andKR20DDET 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]
