How the Super Charger Works

The engine crankshaft Turns the supercharger at a given drive ratio which regulates the amount of air and fuel being forced into the engine. This creates a positive pressure between the intake port on the crankshaft and the supercharger. When the piston is moving into the compression stroke the crankshaft intake port opens allowing the pressurized air and fuel mixture to charge the crankcase on the underside of the piston. As the piston in the cylinder reaches top dead center, the crankcase is completely supercharged with the air and fuel mixture.

The piston in the cylinder reaches top dead center. At this point, the crankcase is completely supercharged with the air and fuel mixture.

The intake port opens as the piston starts on its downward stroke, allowing the supercharged air and fuel mixture to transfer from the crankcase into the cylinder. Some of this supercharged fuel mixture will pass through the exhaust port.

The piston the starts the compression stroke closing the intake port and travles a few degrees higher, closing the exhaust port.

The piston then reaches top dead center, igniting the charge.

After Detonation

The piston decends down the cylinder which opens the exhaust port, allowing a positive sonic pressure pulse along with the hot gases to escape.

The pulse, along with the hot gases, travels toward the end of the exhaust pipe.

The piston continues to complete the cycle, opening the intake port allowing the supercharged fuel and air mixture to flood into the cylinder. It continues on the compression stroke, closing the intake port.

Returning from the last detonation is the sonic pressure pulse, which has traveled the entire length of the exhaust pipe. The pulse is reflected back toward the cylinder by the divergence cone in the exhaust pipe. As this sonic pressure wave travels back toward the cylinder, it forces the escaping supercharged fuel/air mixture back into the cylinder prior to the exhaust port closing. This supercharges the cylinder with the additional air and fuel created by the supercharger mounted on the intake of the engine.