This is a setup post for the first proper IMP UE4 reveal. The IMP KK-Series is the first of the new generation IMP gasoline engines, designed to meet upcoming, even stricter emission standards. It is the exclusive gasoline powerplant of the 2018 Impakt range.
The KK-Series is a small-displacement Inline 6 engine, with a Magnesium engine block and Aluminium-Silicium cylinder head, 76.5x81.5mm bore and stroke and a bore spacing of 87mm. It features 5-valve per cylinder technology, GV2 VVT, IMP i6De III direct fuel injection with 450bar of injection pressure, a variable length intake manifold and fully forged bottom end with a 7 main roller-bearing crankshaft.
The KK-Series replaces the KE-series of small Inline 6 engines on which it is based. The core engine, with 2.25L of displacement remains largely unchanged, the pistons have been changed from forged aluminium to forged steel with graphite coating for lower friction and thermal expansion. The main differences lie in the accessories and the Exhaust system including the Turbocharger. On the KK, the Turbocharger is now a Borg-Warner Twin-Scroll VGT unit, which allowed us to eliminate the electronic Boost Controller. Furthermore the Catalytic converter has been moved directly after the Turbocharger, and all KKs are fitted with a Gasoline Particulate Filter (GPF). The Starter motor and Alternator have been replaced by an Integrated Starter-Generator (ISG) fed by 48V Electrics which can also aid the engine in stop-start traffic, making the Impakt a mild-hybrid. This reduces intra-urban fuel consumption by up to 26%. The 2018 Impakt 225e with 175hp now consumes less than 4.5L/100km. The KK is also the first production engine to meet the Euro 6c norm.
The KK-Series comes in four variants that only differ by engine management and Turbocharger, and in case of the GET also the Camshafts:
KK-22FQT: 175hp, 275Nm, engine redline 7000rpm
KK-22FET: 210hp, 320Nm, engine redline 7000rpm
KK-22LET: 270hp, 380Nm, enigne redline 7750rpm
KK-22GET: 324hp, 410Nm, engine redline 8750rpm
Expect the KK-Series to appear in more future IMP and Monolith vehicles.