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BorgWarner supplies advancements in VCT for Subaru boxer engines

ABR Staff Writer Published 04 March 2011

BorgWarner, a provider of engineered components and systems for vehicle powertrain applications worldwide, is supplying its latest advancements in Cam Torque Actuated (CTA) variable cam timing (VCT) technology for the new Subaru boxer engines.

Subaru said that the new four-cylinder 2.5- and 2.0-liter engines improve fuel economy 4 to 6% and 10%, respectively, compared with previous models, and meet US super ultra low emissions vehicle (SULEV) and Euro 5 emissions standards.

The company said that the 2.5-liter engine features its CTA technology, while the 2.0-liter engine introduces its CTA technology with a new mid position lock.

Launched on the Forester, the boxer engines are expected to become Subaru's main engines.

BorgWarner president and general manager of Morse TEC James Verrier said the company continues to demonstrate product leadership with breakthroughs in VCT technology.

"Our innovations give engine designers more precise control over intake and exhaust valve timing for better fuel economy and lower emissions without sacrificing performance," Verrier said.

"We are very pleased to contribute our technologies to the all-new Subaru boxer engine."

The company will manufacture its VCT technologies for Subaru at its facility in Aoyama, Japan.

BorgWarner's CTA technology utilizes the existing torsional energy in the valve train to phase the camshaft, similar to a hydraulic ratchet.

CTA cam phasers operate more quickly and under a wider range of engine speeds and temperatures than traditional oil pressure actuated cam phasers, enabling engines to run more efficiently at all engine speeds with faster response.