OBJECTIVE: Wet flow, pressure excursions, port volume, runner length, plenum volume—all these figure into an engine's overall efficiency. But there's more… Sometimes theory is neat, but ...

For most street engines, a good curve should have achieved total mechanical advance by 2,800 to 3,000 rpm. See All 10 Photos This is a typical mechanical-advance mechanism on the top of an MSD ...

The volumetric efficiency table is probably the most important one in any ECU.The vertical axis is engine load, in this case, ...

Fuel consumption, however, does not follow the same curve as the manifold pressure. Full retard results in the most fuel consumption and full advance appears to have the least fuel consumption.

In a perfect world there would be no need for ignition advance curves. As soon as the piston in your vintage Vette reached top dead center and the engine built maximum compression, you'd be able ...

In diesel performance, achieving optimal airflow is the cornerstone to unlocking your engine’s full potential. For owners of the 6.7L Cummins, upgrading the intake system is a popular and ...

This creates positive pressure inside the intake manifold, which compresses the air. Denser compressed air helps the engine burn fuel more thoroughly, giving you more power. The main advantage of ...

The manifold absolute pressure sensor reads the amount of pressure or vacuum (also called “engine load”) in the intake manifold, where outside air is divvied up in proper amounts and ...

When the engine is made to pull hard from low speeds, the manifold pressure becomes positive at something above 2000 rpm and the maximum governed pressure is reached at 3800, remaining steady up ...

This causes positive pressure to build in the manifold, compressing the air. In a twin-screw style supercharger, the two rotors are designed to mesh with one another and compress the air forced ...