In the low- and medium-rpm ranges, intake-valve lift is kept low to reduce camshaft friction and improve fuel efficiency. Better response - Controlling air intake at the intake-valves improves ...

and now Audi's new system is taking things a step further -- by controlling the valve lift, the volume of air drawn in a cross-section of the intake duct is influenced as well. When added to the ...

One of the chief inefficiencies of these engines is the restriction that’s created by the throttle plate in the intake passage, which is used to regulate how much air feeds the cylinders.

This air-powered broom will quickly clear your floors better than a traditional broom, and costs less than $15 to make. A messy shop floor leads ... and an air-valve and coupler to make the ...