One of the most difficult tuning problems to overcome is the seemingly ever-present engine vacuum leak. Vacuum is an important component of the internal-combustion process because it controls basic ...

Question: why is vacuum so important on a vehicle? Answer: Vacuum is created when each piston moves down the cylinder with the intake valve open. It will change as the engine is running at different ...

Indeed, there are some very real benefits to be gained from using natural engine vacuums (in either the intake manifold or the header collectors) to evacuate the crankcase, but unfortunately, many ...

Your intake manifold is the heart of your engine’s breathing system, and when it’s clean, sealed, and tuned right, performance and efficiency thrive. From spotting vacuum leaks to knowing when to ...

The volumetric efficiency table is crucial for understanding ECU performance. The vertical axis represents engine load ...