Valve lifters are small components in an engine that help open and close the valves. They move up and down to control the amount of air and fuel entering the engine, which affects how it runs. 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)