Here’s how to remove the air injection system on a BMW Airhead. From Clymer’s BMW R Series: 1970-1994: “The air injection system injects fresh air into the exhaust port in each cylinder head adjacent ...

In the past two months we've covered most of the emission systems that have appeared on recent automobiles. This month we'll conclude our discussion of these systems with those devices designed to ...

Garrett Motion. has filed a patent for methods and systems utilizing model-based calculations to control mass flow in internal combustion engines. The system includes a secondary air injection valve ...

Most operators know that air should be kept out of a heat exchanger’s cooling water supply line. Air can collect in pockets and block flow, increasing velocities, increasing system resistance, ...