We have already waxed ecstatic about the new 2011 Mustang GT 5.0 and what a major shift this new engine represents in our test drive article earlier this week. But for those looking for more technical depth to what makes this new DOHC engine tick, lets explore one of the key factors in how the new 5.0 V8 makes 412 naturally aspirated horsepower so raw yet so refined.
The 2011 Mustang GT’s new 5.0 V8 uses twin independent variable cam timing, or what Ford calls Ti-VCT. Ford worked with supplier BorgWarner to bring this technology to the 5.0, utilizing the company’s Cam Torque Activated (CTA) drive components.
BorgWarner’s CTA technology optimizes variable cam timing, making it more efficient at all engine speeds with faster response than traditional hydraulic oil-actuated VCT systems. Also featuring BorgWarner’s resonance attenuation technology, the timing drive system improves overall engine efficiency, helping the Mustang achieve 412 horsepower and 390 ft. lb. of torque. The new 5.0 Mustang is the first to feature both advanced technologies from BorgWarner.
Unlike traditional cam phasing methods, which typically use engine oil pressure to phase the camshaft, BorgWarner’s patented CTA technology harnesses the existing torsional energy in the valve train to accomplish timing advances. Similar to a hydraulic ratchet, cam phasers operate more quickly and under a wider range of engine speeds and temperatures than traditional oil pressure actuated cam phasers. The system provides an astounding 50 degrees of advance or retard in timing, enabling optimal air flow into and out of the engine for most operating conditions.
In addition, the cam phasers are fully functional shortly after engine start, the critical time when a large percentage of engine emissions occur and before the catalytic converter is effective. The result: better fuel economy, lower emissions, and more torque and horsepower.
Because of the physics of variable cam timing and the many running adjustments that can take place during driving, refinement has always been a challenge with these systems. In this case, the Mustang 5.0 V8 also has a patented resonance attenuation technology to reduce chain tension and camshaft oscillation. The technology allowed Ford to use an uncompromised valvetrain in order to achieve peak high speed performance while keeping a high level of refinement under foot.
The outcome of this new technology in Ford’s application is that it is seamless. You never feel it “happening”. The onset of cam advance and retard happens in the background so to speak so all you fell is a smooth rush of power when you step on it. And you notice better fuel efficiency at the pump when you don’t.
