GM High Feature engine
|Also called||Alloytec V6|
|Type||DOHC 60° 24-valve V6|
|Dry weight||168 kg (370 lb) (3.6 V6 High Feature engine)|
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 High Feature moniker on the Holden produced engine is reserved for the twin cam pasing High output version. 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 and fillet rolled crankshaft, forged connecting rods, a variable intake manifold, twin knock control sensors and coil-on-plug ignition. 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, Inc.
The HFV6 was first designed, tested and produced in a joint team by Cadillac and Holden. A majority of design into the new alloy construction, transmission pairing and first use in production were all undertaken in Detroit (and manufactured in St Catherines). Holden had the job of developing smaller engines (Holden 3.2, LP1 and LP9 Turbo) as well as their own Holden HFV6 (called the Alloytec V6) for local models.
Cadillac and Holden both tested variations of these engines in US and Australia.
North America and Australia remain the only two places that manufacture the HFV6.
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 256 hp (191 kW; 260 PS) at 6200 rpm and 237 ft·lbf (321 N·m) torque, with gasoline direct injection allowing a high compression ratio of 11.25:1. The engine is also equipped with cam-phasing on both inlet and exhaust side, thus the name "TwinPhaser".
Alfa Romeo only acquires the core designs and productions of the HFV6. It is then taken to their factory and modified for their performance, fuel economy and soundtrack.
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 lb·ft (297 N·m) at 3200 rpm.
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 lb·ft (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) depending on the vehicle induction and exhaust system designs. The lower powered versions only have variable cam phasing on the inlet cam. Selected models also include variable intake. The engine weighs 370 lb (170 kg) as installed.
This engine is produced in North America and Australia.
On the Lambda crossover SUVs (Saturn Outlook, GMC Acadia, and Buick Enclave) it produces 275 hp (205 kW) and 251 lb·ft (340 N·m). The Holden Alloytec version has been modified to meet Euro III emissions standards and has an output of 262 hp (195 kW) and 251 ft-lbf (340 N-m). A dual fuel 235 hp (175 kW) version able to run on petrol and autogas (LPG) has also been produced by Holden in Australia.
- 2004 Cadillac CTS
- 2004 Buick Rendezvous CXL/Ultra
- 2004 Cadillac SRX
- 2004 Holden VZ Commodore
- 2005 Buick LaCrosse CXS
- 2005 Cadillac STS
- 2006 Holden VE Commodore
- 2006 Holden WM Statesman
- 2006 Holden WM Caprice
- 2007 Saturn Aura XR
- 2007 Saturn Outlook
- 2007 Pontiac G6 GTP
- 2007 GMC Acadia
- 2008 Buick Enclave
- 2008 Chevrolet Malibu
- 2008 Saturn Vue XR
- 2008 Pontiac G8
- 2008 Chevrolet Equinox Sport
- 2008 Pontiac Torrent GXP
- 2008 Pontiac G6 GXP
The 3.6 liter (3564 cc) LLT is a direct injected version of the LY7. It was first unveiled in May 2006, and was claimed to have 15 percent greater power, 8 percent greater torque, and 3 percent better fuel economy than its port-injected counterpart. It has a compression ratio of 11.4:1, and has been certified by the SAE to produce 302 horsepower (225 kW) at 6300 rpm and 272 lb·ft (369 N·m) of torque at 5200 rpm on regular unleaded (87 octane) gasoline. This engine debuted on the 2008 Cadillac STS and CTS. GM will use a LLT in all 2009 Lambda-derived crossover SUVs to allow class-leading fuel economy in light of the new Corporate Average Fuel Economy (CAFE) standards. In the Lambdas, LLT engine produces 286 horsepower (213 kW) and 255 lb·ft (346 N·m) of torque.
- 2008 Cadillac CTS
- 2008 Cadillac STS
- 2009 Chevrolet Traverse
- 2009 Saturn Outlook
- 2009 GMC Acadia
- 2009 Buick Enclave
The 3.6 L (3564 cc) LCS is derived from the direct-injected LLT for use in hybrids, using the two-mode system . Differences from the LLT include a slightly lower compression ratio, 11.3:1, and lower power and torque peaks. It will debut in the 2009 Saturn Vue Hybrid, where it will make 262 hp (195 kW) at 6100 rpm and 250 lb·ft (339 N·m) of torque at 4800 rpm. 
- 2009 Saturn Vue Hybrid
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 (157 kW) at 6500 rpm, and 194 lb·ft (263 N·m) at 3300 rpm.
- 2005–2007 Cadillac CTS
The LP9 is a 2.8 L turbocharged version is used for the Saab 9-3 and other GM vehicles. It produces 255 hp (190 kW) EEC at 5500 rpm and 258 lb·ft (350 N·m) between 1800 and 5000 rpm. It has the same bore and stroke as the naturally-aspirated LP1, however the compression ratio is reduced to 9.5:1. There are also other variants available, with 230 hp (172 kW) EEC and 280 lb·ft (380 N·m) EEC. GM Powertrain Sweden (Saab Automobile Powertrain) has been responsible for the turbocharging of the engine. The engine is built in Port Melbourne, Australia.
- 2007 Cadillac BLS
- 2010 Cadillac SRX
- 2006 Opel Vectra
- 2006 Opel Signum
- 2009 Opel Insignia
- 2006 Saab 9-3
- 2010 Buick LaCrosse
- 2010 Cadillac SRX - 260 hp (194 kW; 264 PS),221 ft·lbf (300 N·m)
- 2010 Chevrolet Equinox
Suzuki builds the High Feature V6 at its Sagara, Japan plant for the Suzuki XL-7 SUV under license from General Motors. Displacing 3.6 L, this engine produces 252 hp (188 kW) at 6500 rpm and 243 lb·ft (329 N·m) at 2300 rpm.
- 2007 Suzuki XL-7
On March 21, 2007 it was reported by AutoWeek that GM is planning to develop a 60-degree V12 based on this engine family to power the top version of Cadillac's upcoming flagship sedan. This engine would essentially consist of two 3.6 L High Feature V6s attached end-to-end on a single crankshaft, and would feature such high-end technologies as direct injection and cylinder deactivation. If so, the engine would displace 7.2 liters, and produce approximately 600 hp (447 kW) and 540 lb·ft (732 N·m) of torque. Development of the engine was reportedly being conducted in Australia by Holden. 
In August, 2008, GM announced that development of the V12 had been canceled. The CAFE standards are most likely to blame. 
- Hellwig, Ed (2007-01-08). "Detroit Auto Show: 2008 Cadillac CTS". edmunds.com. http://www.edmunds.com/insideline/do/Features/articleId=119071. Retrieved on 4 January 2009.
- Brennan, Reilly (2007-05-08). "Cadillac Ups STS Horsepower Rating To 302". nextautos.com. http://www.nextautos.com/body-stylesmarket-segment/sedans/cadillac-ups-sts-horsepower-rating-to-302. Retrieved on 4 January 2009.
- Engine - Power Curve
- Engine - Power Curve
- Engine - Power Curve
- SHOWBIZ JAN08.qxd (Page 1)
- Model Information - Online Ordering Guide
- Roth, Dan (2008-12-17). "DI FTW: GM unveils new direct-injection 2.4L EcoTec and 3.0L V6". autoblog.com. http://www.autoblog.com/2008/12/18/di-ftw-gm-new-direct-inject-2-4l-ecotec-and-3-0l-v6. Retrieved on 17 December 2008.
- Abuelsamid, Sam (2009-01-04). "Detroit Preview: 2010 Cadillac SRX reborn". autoblog.com. http://www.autoblog.com/2009/01/04/detroit-preview-2010-cadillac-srx-reborn. Retrieved on 4 January 2009.
- prnewswire.com (2007-03-21). AutoWeek Breaks Major Cadillac News in March 26 Issue. Press release. http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/03-21-2007/0004550743&EDATE=. Retrieved on 2009-01-04.
- "Cadillac cancels plans for V12 XLKS flagship sedan". autospies.com. 2008-08-21. http://www.autospies.com/news/Cadillac-cancels-plans-for-V12-XLKS-flagship-sedan-33871. Retrieved on 4 January 2009.
- Technical article from AutoSpeed
- Cadillac CTS Homepage
- Caddyinfo.com - Cadillac Discussion Forum, How-To, and Technical Information
- GM Unveils New Direct Injection V-6 - Ward's Auto World.