High Performance Exhaust by D'Shannon

New Design

Automobile designers and hot-rodders have known for decades that tuned exhaust creates a more powerful, more efficient engine. But factory aircraft exhaust systems have not had the advantage of tuning. D'Shannon can fix that on your baron's engine. A tuned exhaust reduces the pressure at the exhaust port just before the exhaust valve closes, to a level below the pressure in the intake manifold. This reduction must be precisely timed to happen during the overlap, the brief period when both the exhaust and intake valves are open. If tuned properly, each exhaust pulse creates a wave that pulls the next exhaust pulse along. Thus, the spent exhaust gas is not only pushed out by the piston, it is pulled out as well. This means a fresh fuel/air mixture is drawn into the cylinder while exhaust gases are simultaneously removed. The denser charge of fresh, cool mixture, free of residual exhaust, results in greater power output.