Tag: vvt

Variable Valve Timing and Performance Applications Part I: Cam Selection

Aug 2013 | HOTROD Professional Features

Lots and lots of critical questions, and you’ll need your sharpest wits and the advice of the cam grinders to answer them accurately

VANOS Variable Valve Timing: Evolution, Troubles, and Service

Mar 2013 | BMW, Engine Mechanical, the bimmer pub features

Valve diameter, lift, and overlap are all contributing factors to the volumetric efficiency of an engine. If you can vary the relationship between the intake and exhaust valves you can broaden the power band and still have a smooth, clean idle. Variable valve timing is a great advance — as long as we can keep it working.