Exhaust manifold

The exhaust manifold is the pipework that collects exhaust gas from the cylinders and delivers it to the turbocharger turbine. Its volume sets the turbocharging method. A constant-pressure manifold is a large common receiver that damps the cylinder pulses into a steady pressure, the standard choice on low-speed two-stroke engines, giving high turbine efficiency at high load. A pulse manifold uses short, small-bore branches grouped in twos or threes so the kinetic energy of each blowdown reaches the turbine, favored on medium-speed four-stroke engines for fast load response. The manifold is jacketed or lagged to limit heat loss and protect crew.