Valve lift refers to how high the intake and exhaust valves open inside an engine. It affects how much air and fuel can enter the combustion chamber, thus impacting the power and efficiency of the engine. Full definition
Direct - injection and a variable valve lift system are some of the enhancements that we can expect to see in 2014. (thetorquereport.com)
It's a load management system with an earlier intake cut - off and intake valve lift adjustment, a first in a turbocharged direct - injection engine. (paultan.org)
In higher load ranges the system switches to the higher valve lift to achieve the engine's full power delivery. (greencarcongress.com)