First Variable Cam Timing System for Pushrod Engines Debuts

Michigan-based BorgWarner Morse TEC has begun production of its first high-volume variable cam timing (VCT) systems for a new family of General Motors V6 engines being introduced this year. This system uses a “Torsional Assist” technology instead of the conventional oil-pressure actuated approach. The new technology works on both overhead valve and overhead cam engines, and according to the company, represents a leap to the next generation of cam phasing. BorgWarner VCT technology includes devices that utilize camshaft torque as their actuation energy, in contrast to conventional phaser devices that depend on engine oil pressure for actuation. Camshaft phasing technology is rapidly becoming a standard in the global engine market. The worldwide market that will utilize this technology is expected to grow 500 percent from 2000 figures of 5.2 million engines, to over 26 million engines by 2009. The technology will be installed in the new 3.5L and 3.9L V-6 engines in the 2006 model year Chevrolet Impala, Chevrolet Monte Carlo, and Pontiac G6.