Rick Kertes, Author at UnderhoodService
Valve Timing Events And The Order Of Importance

Valve timing events can be tailored in several ways. Option one is duration can be added or subtracted. If duration is added to the lobe, the valve is opened and closed later. Conversely, removing duration delivers inverse results. The other method is advancing or retarding the camshaft. Advancing the cam lobe opens and closes the valve earlier, while retarding the lobe produces the opposite occurrence.