Motorcycle Pair Valve and Secondary Air Injection System Functionality on Carburetted Engines
The Secondary Air Injection (SAI) system is a thermodynamic mechanism designed to oxidize unburned hydrocarbons within the exhaust stream by injecting fresh air during low RPM deceleration cycles, thereby reducing emissions and preventing backfires in carburetted internal combustion engines. This concept operates distinctly from Exhaust Gas Recirculation (EGR), which utilizes recirculated exhaust gases to lower combustion temperatures for NOx reduction in diesel applications; SAI functions by enriching the post-combustion mixture to facilitate complete oxidation of residual fuel under specific operational boundaries defined by manifold vacuum and valve actuation.
Motorcycle Pair Valve and Secondary Air Injection System Functionality on Carburetted Engines
The Secondary Air Injection (SAI) system is a thermodynamic mechanism designed to oxidize unburned hydrocarbons within the exhaust stream by injecting fresh air during low RPM deceleration cycles, th…