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The Tau τ is a family of gasoline V8 engines produced by the Hyundai Motor Company. It replaced the Omega engine line.

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τ-engine  Tau engine
Overview
Manufacturer	Hyundai Motor Company
Production	2008–2021
Layout
Configuration	V8
Displacement	4.6 L (4,627 cc) 5.0 L (5,038 cc)
Cylinder bore	92 mm (3.62 in) 96 mm (3.78 in)
Piston stroke	87 mm (3.43 in)
Block material	High pressure die cast aluminum
Head material	Aluminum
Valvetrain	DOHC 4 valves x cyl. with D-CVVT
Compression ratio	10.4:1, 11.5:1, 11.8:1
Combustion
Fuel system	Multi-port fuel injection Direct injection
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	366–435 PS (269–320 kW; 361–429 hp)
Torque output	44.8–53 kg⋅m (439–520 N⋅m; 324–383 lbf⋅ft)
Chronology
Predecessor	Omega

Tau MPi

Petrol engines^{[citation needed]}

Model	Engine code	Power@rpm	Torque@rpm	Compression ratio
4.6 Tau MPi (366PS)	G8BA	366 PS (269 kW; 361 hp) @ 6500	44.8 kg⋅m (439 N⋅m; 324 lbf⋅ft) @ 3500	10.4:1
4.6 Tau MPi (390PS)	G8BA	383 PS (282 kW; 378 hp) @ 6500 (Regular) 390 PS (287 kW; 385 hp) @ 6500 (Premium)	44.8 kg⋅m (439 N⋅m; 324 lbf⋅ft) @ 3500 (Regular) 46 kg⋅m (451 N⋅m; 333 lbf⋅ft) @ 3500 (Premium)
5.0 Tau MPi	G8BB	Premium fuel: 400 PS (294 kW; 395 hp) @ 6400	51 kg⋅m (500 N⋅m; 369 lbf⋅ft) @ 3500

Specifications

4.6 Tau MPi[1] for the Genesis' 4.6L Tau V8 engine:

• Displacement (bore x stroke): 4.6 L (4,627 cc) (92 mm × 87 mm (3.62 in × 3.43 in))[2]
• Block material: High pressure die casting aluminum block
• Cylinder head material: Aluminum
• Valvetrain: Dual Over Head Cam (DOHC)
• Valve timing: Continuous variable valve timing
• Variable induction system
• Fuel delivery: Multi-port fuel injection
• Recommended fuel: Premium Unleaded, though it can run safely on regular gasoline with reduced performance

Application

4.6 Tau MPi

• 2008–2009 Kia Mohave/Borrego
• 2008–2012 Hyundai Genesis
• 2009–2011 Hyundai Equus

Hyundai Motor Company has also shown a supercharged version of the 4.6 Tau MPi engine at 2008 SEMA show,[3] and later 2009 Chicago Auto Show. This engine was equipped with a supercharger and cylinder deactivation technology to produce an estimated 460 hp (343 kW) while returning better fuel economy.[4]

Tau GDi

First version (2012–2014)

The Tau GDi uses gasoline direct injection.

Petrol engines

Model	Engine code	Power@rpm	Torque@rpm	Compression ratio
5.0 Tau GDi	G8BE	430 PS (316 kW; 424 hp) @ 6400 (Regular) 435 PS (320 kW; 429 hp) @ 6400 (Premium)	52 kg⋅m (510 N⋅m; 376 lbf⋅ft) @ 5000	11.5:1

Specifications

5.0 Tau GDi[5] for Equus' 5.0L Tau V8 engine:

• Horsepower: 429 hp (320 kW)
• Torque: 52 kg⋅m (510 N⋅m; 376 lbf⋅ft)
• Displacement (bore x stroke): 5.0 L (5,038 cc) (96 mm × 87 mm (3.78 in × 3.43 in))
• Compression ratio: 11.5:1
• Block material: High pressure die casting aluminum block
• Cylinder head material: Aluminum
• Valvetrain: Dual Over Head Cam (DOHC)
• Valve timing: Dual-Continuous variable valve timing(D-CVVT)
• Variable induction system
• Fuel delivery: Gasoline direct injection / Electronic fuel injection
• Recommended fuel: Premium Unleaded, though it can run safely on regular gasoline with reduced performance

Current version (2015–2021)

Updates to the 2015 Genesis 5.0 Tau V8 included: [6]

• Bump in compression ratio from 11.5:1 to 11.8:1
• Optimized intake runner length
• Enhanced timing chain for reduced friction and NVH
• Low-torque exhaust manifold
• Upgraded multiple-injection mapping
• Dual Continuously Variable Valve Timing (D-CVVT), a tuned variable induction system, and low-friction coatings on piston skirts
• Improved Low-end response along with better efficiency and NVH

Model	Engine code	Power@rpm	Torque@rpm	Compression ratio
5.0 Tau GDi	G8BE	413 PS (304 kW; 407 hp) @ 6000 (Regular) 425 PS (313 kW; 419 hp) @ 6000 (Premium)	51.4 kg⋅m (504 N⋅m; 372 lbf⋅ft) @ 5000 (Regular) 53 kg⋅m (520 N⋅m; 383 lbf⋅ft) @ 5000 (Premium)	11.8:1

Application

• 2016–2020 Genesis G80 (DH)
• 2015–2021 Genesis G90 (HI)
• 2011–2015 Hyundai Equus (VI)
• 2011–2016 Hyundai Genesis
• 2012–2021 Kia K9

Awards

The 4.6 Tau V8 Engine was named to the Wards 10 Best Engine Awards for 2009 and 2010.[7] The Tau V8 received the award due to the engine's "velvety power delivery, competitive performance, and attainable price-- all of which epitomize the Korean auto maker's drive for world-class engineering", as quoted by Forbes. This was Hyundai Motor Co. Ltd. first appearance on Ward's 10 Best Engines list. The 5.0 Tau Engine was also named in the same awards for 2011.

See also

• List of Hyundai engines

References

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