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GM High Feature engine

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High Feature V6 (aka: Alloytec V6)
Manufacturer General Motors
Production 2004
Predecessor 54° V6
Class DOHC 60° 24-valve V6
Engine 2.8 L (2792 cc/171 in³)
3.2 L (3195 cc/195 in³)
3.6 L (3564 cc/217 in³)
Similar Chrysler SOHC
Ford Cyclone
Honda J-series
Nissan VQ
Toyota GR


The 3600 LY7 (and derivative LP1) are members of General Motors' new High Feature (or HFV6) engine family of modern DOHC V6s. This new family of engines was introduced in 2004 with the Cadillac CTS. Holden sells the HFV6 under the name, Alloytec. The block was designed to be expandable from 2.8 L to 4.0 L.

It is a 60° 24-valve design with aluminum block and heads and Sequential Electronic Fuel Injection. Most versions feature continuously-variable cam phasing on both intake and exhaust valves and electronic throttle control. Other features include piston oil-jet capability, forged crankshaft and connecting rods, variable intake, and electronic throttle control. It was developed by the same international team responsible for the Ecotec, including the Opel engineers responsible for the 54° V6, with involvement with design and development engineering from Ricardo PLC of England.

High Feature V6 engines are produced at Fisherman's Bend in Port Melbourne, Australia, St. Catharines in Canada, and Flint Engine South in Flint, Michigan.

Alfa Romeo

Alfa Romeo uses the High Feature engine design, though with many modifications, as the JTS V6. The Alfa unit features lean-burn technology as on many other engines from the company. It displaces 3.2 L (3195 cc) and has an output of 190 kW (255 hp) at 6200 rpm and 322 N·m (237 ft·lbf) torque, with gasoline direct injection allowing a high compression ratio of 11.25:1.

Applications:

Holden 3.2

Holden has built its own 3.2 L version of the High Feature engine in Australia. Branded with the Alloytec name like the 3.6 L version, this version produces 227 hp (169 kW) at 6600 rpm and 219 ft·lbf (297 N·m) at 3200 rpm.

Applications:

LY7

An LY7 in a Cadillac STS

The 3.6 L (3564 cc) LY7 version was introduced in the 2004 Cadillac CTS sedan. It has a 10.2:1 compression ratio and produces 255 hp (190 kW) at 6200 rpm and 252 ft·lbf (342 N·m) at 3100 rpm. The bore is 3.70 in (94.0 mm) and the stroke is 3.37 in (85.6 mm). In some applications, including the Buick LaCrosse and Holden Commodore, the LY7 has an output of 235 to 262 hp (175 to 195 kW) and 225 to 251 ft·lbf (305 to 340 N·m) equipped with either cam-phasing on the inlet side only or both inlet and exhaust. Selected models also do not include variable intake. On the Lambda crossover SUVs (Saturn Outlook, GMC Acadia, and Buick Enclave) it is expected to produce 275 hp (205 kW) and 251 ft·lbf (340 N·m). The Holden Alloytec version has been modified to meet Euro III emissions standards. A 235 hp (175 kW) version able to run on autogas (LPG) has also been produced.

In May 2006, GM unveiled a new version of this engine that featured a direct injection system, which GM claims will have 15% greater power, 8% greater torque, and 3% better fuel economy than the current port-injected version. Although GM did not give specific output figures, a 15% increase in power and 8% increase in torque over the highest-output version of the current model would allow it to generate over 300 horsepower and 270 ft·lbf of torque. Although GM has not officially announced a launch vehicle for this engine, it is widely expected to debut in the second-generation Cadillac CTS.

Applications:

Future applications:

LP1

A 2.8 L (2792 cc) LP1 variant was introduced in the 2005 Cadillac CTS. It has a 3.50 in (89.0 mm) bore, a 2.94 in (74.8 mm) stroke, and a 10.0:1 compression ratio. It generates 210 hp (156 kW) at 6500 rpm, and 194 ft·lbf (263 N·m) at 3300 rpm.

Applications:

Suzuki

Suzuki builds its own version of the High Feature V6 at its Sagara, Japan plant for the Suzuki XL-7 SUV. Displacing 3.6 L, this engine produces 252 hp (185 kW) at 6500 rpm and 243 ft·lbf (329 N·m) at 2300 rpm.

Applications:

Turbo

2.8 L turbo V6 in a 2006 Saab 9-3 SportCombi

A 2.8 L turbocharged version is used for the Saab 9-3 and other GM vehicles. It produces 250 hp DIN (184 kW) at 5500 rpm and 258 ft·lbf (350 N·m) at 2000 rpm. It has the same bore and stroke as the naturally-aspirated LP1, however the compression ratio is reduced to 9.5:1. There is also another variant available, with 230 hp DIN (169 kW). This engine is partly developed by Saab Automobile, and built in Australia.

Applications:


Years Engine Cylindrates
1954–1994 Twin Cam 1290, 1570, 1750, 1779, 1962
1992–present TwinSpark 1.4, 1.6, 1.7, 1.8, 2.0
1971–1995 Flat-4 1186, 1286, 1350, 1490, 1712
1979–2006 V6 2.0, 2.5, 3.0, 3.2
2006–present GM based V6 3.2


Other links

See also