The inline-4 engine has become a standard powertrain across most automakers' vehicle lineups, due mostly to its small size and efficiency. But, have you ever wondered how inline-4 engine actually ...

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 sometimes it ...

In most tests on engines up to 6,500 rpm, a modern high-rise dual-plane intake like this Chevrolet Performance example on a Chevy 350 generates the best overall average torque and power numbers ...