The Tau V8 engine powering Hyundai’s Genesis sedan is the first in a family of “premium” engines up to 5.5 L, the company says.
The 4.6-L unit with 32 valves actuated by double overhead camshafts has a bore of 92 mm (3.62 in) and a stroke of 87 mm (3.43 in). It generates 375 hp (280 kW) at 6400 rpm and 451 N·m (333 lb·ft) on premium unleaded gasoline. Specific output is 81.5 hp/L, and the compression ratio is 10.4:1. On regular unleaded, the figures are 369 hp (275 kW) and 439 N·m (324 lb·ft).
Fuel delivery for the naturally aspirated unit is via multiport injection. A dual continuously variable valve timing system is used.
About 100 engineers were involved in the clean-sheet design, which took 48 months to develop at a cost of 260 billion won, according to Hyundai. The development was led by 25-year Hyundai veteran Jeon Chun-Seok. The company had produced V8 engines based on a Mitsubishi design, but the new engine was developed with Hyundai core, proprietary technologies.
Engine features include two-step variable induction system, stainless-steel exhaust manifolds, and high-performance catalyst. A silent timing chain, serpentine-belt accessory drive, and crankcase bedplate are major factors in good engine NVH performance, according to the company. The block and head are both aluminum.
The engine is mated to a ZF six-speed automatic.
Among the major suppliers for the engine are Eaton, INA, Denso, Bosch, Kefico, Seojin Cam, and Metaldyne. Eight global and 145 domestic Korean suppliers were used.