What is the function of the secondary air pump in the Besturn B50?

[VonAna]

The secondary air pump in the Besturn B50 serves to inject air into the exhaust manifold after a cold engine start, thereby reducing emissions. Below is a detailed introduction to the secondary air system: 1. Function: The secondary air system is one of the external purification devices designed to reduce tailpipe emissions. It introduces additional air into the exhaust gases to increase oxygen content, allowing unburned harmful substances like carbon monoxide (CO) and hydrocarbons (HC) to undergo further combustion under high-temperature conditions. 2. Working Principle: When the engine is running, the crankshaft drives the air pump via a belt, generating a high-volume, low-pressure airflow that passes through a hose to a diverter valve. Under normal conditions, the diverter valve opens, directing the airflow through a one-way valve into the air injection manifold. The air injection manifold then sprays the airflow into the engine's exhaust ports or exhaust manifold, where it reacts with HC and CO in the exhaust gases, converting them further into CO2 and water vapor to minimize exhaust pollution.