An exhaust manifold assembly with a thermal barrier coating for an opposed-piston engine reduces heat rejection to coolant, while increasing exhaust temperatures, fuel efficiency, and quicker exhaust after-treatment light-off. The exhaust manifold assembly can include a coating on the inside surface of the manifold assembly. The coated exhaust manifold assembly can ensure structural robustness of the exhaust manifold assembly over a larger range of operating temperatures.

An exhaust manifold assembly with a thermal barrier coating for an opposed-piston engine reduces heat rejection to coolant, while increasing exhaust temperatures, fuel efficiency, and quicker exhaust after-treatment light-off. The exhaust manifold assembly can include a coating on the inside surface of the manifold assembly. The coated exhaust manifold assembly can ensure structural robustness of the exhaust manifold assembly over a larger range of operating temperatures.

A method of operating a two-stroke cycle, opposed-piston engine comprising a pumping device coupled to pump air to cylinders of the engine through a charge air cooler and an aftertreatment system of thermally-activated devices coupled to receive exhaust from the cylinders by which a thermal state of the exhaust sufficient to sustain thermal activation of one or more of the aftertreatment system devices may be maintained during a deceleration or motoring condition of operation by reducing the mass airflow to the engine.

A method of operating a two-stroke cycle, opposed-piston engine comprising a pumping device coupled to pump air to cylinders of the engine through a charge air cooler and an aftertreatment system of thermally-activated devices coupled to receive exhaust from the cylinders by which a thermal state of the exhaust sufficient to sustain thermal activation of one or more of the aftertreatment system devices may be maintained during a deceleration or motoring condition of operation by reducing the mass airflow to the engine.

A uniflow engine includes a cylinder having a cylinder wall, a volume exterior to the cylinder, at least one channel extending between the cylinder wall and the volume, and a valve outside of the cylinder configured to open and close flow communication between the cylinder and the volume through the channel.

A uniflow engine includes a cylinder having a cylinder wall, a volume exterior to the cylinder, at least one channel extending between the cylinder wall and the volume, and a valve outside of the cylinder configured to open and close flow communication between the cylinder and the volume through the channel.

Methods and systems for providing engine braking for a two stroke diesel engine are described. In one example, a flow through a mechanically driven supercharger is adjusted to provide engine braking for a two stroke diesel engine when engine braking is requested. The level or amount of engine braking may be adjusted via increasing or decreasing flow through the mechanically driven supercharger.

Methods and systems for providing engine braking for a two stroke diesel engine are described. In one example, a flow through a mechanically driven supercharger is adjusted to provide engine braking for a two stroke diesel engine when engine braking is requested. The level or amount of engine braking may be adjusted via increasing or decreasing flow through the mechanically driven supercharger.

Methods and systems for providing engine braking for a two stroke diesel engine are described. In one example, a flow through a mechanically driven supercharger is adjusted to provide engine braking for a two stroke diesel engine when engine braking is requested. The level or amount of engine braking may be adjusted via increasing or decreasing flow through the mechanically driven supercharger.

Methods and systems for providing engine braking for a two stroke diesel engine are described. In one example, a flow through a mechanically driven supercharger is adjusted to provide engine braking for a two stroke diesel engine when engine braking is requested. The level or amount of engine braking may be adjusted via increasing or decreasing flow through the mechanically driven supercharger.