Toyota GZ engine
Toyota's 1GZ-FE engine installed in the GZG50 Century
Overview
Manufacturer	Toyota
Production	1997–2017
Layout
Configuration	60° V12^[1]
Displacement	4,996 cc (304.9 cu in)
Cylinder bore	81 mm (3.189 in)
Piston stroke	80.8 mm (3.181 in)
Valvetrain	DOHC
Compression ratio	10.5:1
Combustion
Fuel system	Electronic port fuel injection
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	206 kW (276 hp; 280 PS) (official) 229 kW (308 hp; 312 PS) (actual, estimated)
Specific power	41.2 kW (55.2 hp; 56 PS) per liter (official) 45.9 kW (61.5 hp; 62.4 PS) per liter (actual, estimated)
Torque output	481 N⋅m (355 lb⋅ft)
Chronology
Predecessor	Toyota V engine (V8)
Successor	Toyota 2UR-FSE engine (V8)

The Toyota GZ engine family consists of a single model, the 1GZ-FE. This engine is used as the powerplant for the second generation Century limousine from 1997 to 2017.

1GZ-FE

The 1GZ-FE is a 4,996 cc (5.0 L) 48-valve DOHC V12 engine with variable valve timing (VVT-i). Bore is 81 mm and stroke is 80.8 mm, with a compression ratio of 10.5:1. The official power output advertised in Japan per the gentlemen's agreement is 206 kW (276 hp; 280 PS) at 5,200 rpm, though it was advertised as 220 kW (295 hp; 299 PS) in export markets. Peak torque of 481 N⋅m (355 lbf⋅ft) is at 4,000 rpm with over 400 N⋅m (295 lbf⋅ft) available from as little as 1200 rpm. The Electronic fuel-injection system is controlled by two ECUs, one for each bank of six cylinders. The engine is capable of running on either bank should a malfunction occur.^[2]

In 2010 the standard engine was revised in order to meet tough fuel economy and emissions standards, reducing power slightly and peak torque to 460 N⋅m (339 lbf⋅ft) although this torque figure had been advertised in export markets since at least 2004.^[3]