Motor Co. says the next-generation of its direct-injected turbocharged EcoBoost engines will feature cooled exhaust gas circulation, a technology typically found on diesels.
The addition of EGR is expected to boost fuel economy in EcoBoost engines 5%,says, noting the technology also reduces the tendency for an engine to knock as it lowers the combustion temperature.
Other technologies being studied for the engines include â€śmore advanced forms of turbocharging,â€ť Ford says, without revealing further details.
The auto maker does not disclose when the next-generation EcoBoost engines will debut, but sources tell Wardâ€™s to expect them by 2015.
Fordâ€™s current-generation EcoBoost mills, which currently come in displacements of 2.0L and 3.5L, already share many attributes of diesels, including a high-pressure, direct-injection system, pistons with optimized bowls to improve combustion efficiency and oil-cooled pistons that reduce in-cylinder temperatures.
But unlike diesels, EcoBoost components are specially developed to handle the higher temperatures found in a gasoline engine, says Brett Hinds, Ford's advance engineering design and development manager.
â€śMany parts had to be upgraded to special metals and alloys that hold up to that environment,â€ť he says in a statement. â€śOur exhaust manifolds, for example, are made of stainless steel, and the turbochargers are made from high-temperature cast-iron alloy.â€ť
EcoBoost and diesel engines also share higher pressures in the fuel system and higher compression ratios.
For example, a regular port-injected engineâ€™s fuel pressure is about 65 psi (4.5 bar), while the pressure at which the fuel is delivered through an EcoBoost engineâ€™s injectors can be as high as 2,250 psi (155 bar), Ford says.