Diesel engines typically offer higher fuel efficiency and torque and longer lifespans than gas engines. How does the lack of a throttle body contribute?

While conventional engines control air intake using a throttle valve, VVEL-equipped engines do this directly at the intake valves, continuously controlling their valve events and lifts.

Learn more about the Fiat's Multiair Valve-Lift System Explained - Article. Read a review and see pictures of the Fiat's Multiair Valve-Lift System Explained at Car and Driver.

At idle, vacuum from behind the throttle tries to lift the valve's piston up ... As conventional diesel engines have no throttle plate and function differently, a dump valve is not required.

In this tech article HOT ROD provides a guide to variable valve timing (VVT) technology which can be found in most late-model performance engines and we explain how hot rodders can get the most ...

In turn, it fed fuel into the engine until it floated its valves after eight minutes at 4,500 rpm, which is way higher than these compression-ignition lumps were ever meant to reach.