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 outlet manifold is provided and includes an outlet portion having first and second sides and an inlet portion to which the outlet portion is fluidly coupled. The inlet portion has first and second sides corresponding to the first and second sides of the outlet portion. Each of the first and second sides of the inlet portion includes one or more tubular members connectable with corresponding tube joints and a mixing chamber fluidly interposed between each of the one or more tubular members and the outlet portion.

An outlet manifold is provided and includes an outlet portion having first and second sides and an inlet portion to which the outlet portion is fluidly coupled. The inlet portion has first and second sides corresponding to the first and second sides of the outlet portion. Each of the first and second sides of the inlet portion includes one or more tubular members connectable with corresponding tube joints and a mixing chamber fluidly interposed between each of the one or more tubular members and the outlet portion.

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 outlet manifold is provided and includes an outlet portion having first and second sides and an inlet portion to which the outlet portion is fluidly coupled. The inlet portion has first and second sides corresponding to the first and second sides of the outlet portion. Each of the first and second sides of the inlet portion includes one or more tubular members connectable with corresponding tube joints and a mixing chamber fluidly interposed between each of the one or more tubular members and the outlet portion.

A valve body for a gas exchange valve of a cylinder of an internal combustion engine can be brought to lie against a valve seat of the gas exchange valve for closing the gas exchange valve and can be removed from the valve seat to open the gas exchange valve. The valve body is formed in multiple parts and has a first valve disc part interacting with the valve seat and a second valve disc part that is connected to the first valve disc part in a fixed manner and faces a combustion chamber of the cylinder. Between the first valve disc part and the second valve disc part a hollow space serving at least for the cooling of the second valve disc part is formed.

A valve body for a gas exchange valve of a cylinder of an internal combustion engine can be brought to lie against a valve seat of the gas exchange valve for closing the gas exchange valve and can be removed from the valve seat to open the gas exchange valve. The valve body is formed in multiple parts and has a first valve disc part interacting with the valve seat and a second valve disc part that is connected to the first valve disc part in a fixed manner and faces a combustion chamber of the cylinder. Between the first valve disc part and the second valve disc part a hollow space serving at least for the cooling of the second valve disc part is formed.

In one aspect, a system is provided and includes an engine including an exhaust valve, an exhaust manifold downstream of the exhaust valve and a muffler downstream of the exhaust manifold. The system also includes a catalyst positioned downstream of the exhaust valve.

An exhaust manifold for a vehicle engine may include a plurality of pipes, a pod, a splined collector and a downpipe. Each pipe in the plurality of pipes are operatively configured to be coupled to a corresponding engine chamber at a proximate portion. The pod is operatively configured to align a flow of exhaust gas emerging from each of the corresponding engine chambers to the associated pipe in the plurality of pipes. The splined collector receives the outlet ends of the pipes at a splined collector inlet. The downpipe may be affixed to the splined collector at a small diameter outlet portion. The downpipe includes a first oxygen sensor operatively configured to communicate with a second oxygen sensor disposed in a downstream catalytic converter and an ECM in order to regulate air and fuel for the vehicle engine.

An exhaust manifold for a vehicle engine may include a plurality of pipes, a pod, a splined collector and a downpipe. Each pipe in the plurality of pipes are operatively configured to be coupled to a corresponding engine chamber at a proximate portion. The pod is operatively configured to align a flow of exhaust gas emerging from each of the corresponding engine chambers to the associated pipe in the plurality of pipes. The splined collector receives the outlet ends of the pipes at a splined collector inlet. The downpipe may be affixed to the splined collector at a small diameter outlet portion. The downpipe includes a first oxygen sensor operatively configured to communicate with a second oxygen sensor disposed in a downstream catalytic converter and an ECM in order to regulate air and fuel for the vehicle engine.