Двигатели GM High Feature: История и Развитие V6

The GM High Feature engine (also known as the HFV6, and including the 3600 LY7 and derivative LP1) is a family of modern DOHC V6 engines produced by General Motors. The series was introduced in 2004 with the Cadillac CTS and the Holden Commodore (VZ). It is a 60° 24 valve design with aluminum block and heads and sequential multi port 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, sinter forged connecting rods, a variable length 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 plc. GM's Australian auto division Holden produced a HFV6 engine under the name "Alloytec."

The HFV6 was designed, tested, and produced in a joint program by Holden and Cadillac. A majority of designs into the new alloy construction, transmission pairing, and first use in production were all undertaken in Detroit (and manufactured in St. Catharines, Ontario). Holden was charged with developing smaller engines (Holden 3.2 LP1 and Saab 2.8 Turbo LP9) as well as their own Holden 3.6 and 3.0 HFV6 (called the Alloytec V6) for local models. Cadillac and Holden both tested variations of these engines in the United States and Australia.

The LCS was derived from the direct injected LLT for use in hybrids, using the two mode system. Differences from the LLT included a slightly lower compression ratio, 11.3:1, and lower power and torque peaks. It was to debut in the 2009 Saturn Vue Hybrid, where it would have made at 6100 rpm and of torque at 4800 rpm. Fuel economy ratings would have been in city, and on highway. However, GM cancelled its plans for the Saturn Vue Hybrid.

Starting with the 2016 Cadillac models, a new generation of High Feature V6s were developed. These new engines have redesigned block architectures with bore centers increased from on prior HFV6 engines to and a redesigned cooling system to target the hottest areas while also facilitating faster warm up. They also incorporate engine start stop technology, cylinder deactivation, 2 stage oil pumps, and updated variable valve timing featuring intermediate park technology for late intake valve closure. Both engines debuted in the 2016 Cadillac CT6.

On March 21, 2007, AutoWeek reported that GM was planning to develop a 60 degree V12 based on this engine family to power the top version of Cadillac's upcoming flagship sedan. This Cadillac would essentially have had two 3.6L High Feature V6s attached crankshaft to crankshaft and would have featured high end technologies including direct injection and cylinder deactivation. If this engine were developed, it would have displaced 7.2 liters, and produced approximately and of torque. Development of the engine was reportedly being conducted in Australia by Holden, with a potential HSV or Statesman application. In August 2008, GM announced that development of the V12 had been cancelled.

Earlier production 2.8L, 3.0L, 3.2L, and 3.6L engines with the three chain design suffered from premature timing chain failures because of a faulty PCV system and extended oil change intervals. Most of the problems occurred on pre LFX engines.

Holden sold a HFV6 engine under the name Alloytec. The High Feature moniker on the Holden produced engine is reserved for the twin cam phasing high output version. The block was designed to be expandable from 2.8 L to 4.0 L. High Feature V6 engines were previously produced in Fishermans Bend, Port Melbourne, Australia, and remain in production at the following four manufacturing locations: St. Catharines Engine Plant, St. Catharines, Canada; Flint Engine South in Flint, Michigan, United States; Romulus Engine Plant in Romulus, Michigan; and Ramos Arizpe, Coahuila, Mexico. The assembly lines for the St. Catharines and Flint facilities were manufactured by Hirata Corporation at its powertrain facility in Kumamoto, Japan. Most of the designs of this motor happened in Flint. They were first produced for the Cadillac range. The engine block and cylinder heads are cast at Defiance Foundry in Defiance, Ohio.