|Ford’s new 3.5-liter V6.|
Ford has unveiled its new 3.5-liter V6 engine platform, a more powerful and cleaner engine that eventually will be under the hood of one in five Ford products in North America.
An all-new architecture provides significant flexibility to incorporate additional engine technologies. The 3.5-liter engineering team included extra provisions to make upgrades relatively simple. These upgrades include such potential features as hybrid capability, gasoline direct injection and direct-injection turbocharging.
The new engine will be mated to a new 6-speed automatic transaxle in the upcoming Ford Edge and Lincoln Aviator crossovers, which debut next year. The combination will deliver improved fuel economy of up to 7% and improved sustained acceleration compared with a typical 4-speed automatic.
The new V6 produces 250 hp (187 kW) and 325 Nm of torque with a 3.5-liter displacement unit the same height and width as the smaller Duratec 30 V6. This more compact form factor enables Ford to install the engine in a wide variety of current and future products.
The 3.5-liter V6’s upper-end was designed as a system, all the way from the throttle body to the exhaust manifolds, to create the optimum flow for peak power and a broad torque curve. Finely-tuned design delivers the required airflow without the need for intake flaps or butterfly valves in the system. Advanced throttle-control software enables precise tuning of engine response to fit the character of each vehicle application while setting the engine to run at its peak efficiency for optimal fuel economy.
The 3.5-liter V6 uses a compact, lightweight dual-overhead cam valvetrain. The engine also incorporates intake variable cam timing (iVCT) to optimize valve timing for a smooth idle, optimal part-load driving and a broad torque curve with good power. The iVCT system uses a hydraulically actuated spool valve that can rotate the intake camshafts up to 40 degrees within a half-second. A low-friction, roller-chain cam drive contributes to fuel efficiency.
The aluminum cylinder heads in the new V6 are designed for high airflow and optimized combustion to support performance, fuel economy and low emissions. The efficient combustion is enhanced by incorporating a centrally located spark plug and a high 10.3:1 compression ratio. The cylinder heads also were designed to accommodate fuel-efficient technology upgrades such as gasoline direct injection.
The new engine is PZEV capable right out of the box. Careful design consideration for the combustion system and catalysts create an engine that can meet stringent emissions standards without the need for expensive add-on technology.
The 3.5-liter V6 is capable of achieving PZEV certification by delivering low cold-start emissions and enabling rapid catalyst light-off, which is a significant accomplishment for a larger displacement V6 engine. This is accomplished with low heat-loss exhaust manifolds and close-coupled catalysts for fast light off during cold start. Optimized fuel injector targeting minimizes cold-start emissions before the catalysts reach operating temperature.—Tom McCarthy, engine systems manager for the 3.5-liter V6 engine program