Optimized VVEL Design Features Achieved through Various Simulation Techniques Validated with Rig Testing: Nissan developed a variable valve event and lift (VVEL) system for their V6 and V8 gasoline engines in 2007 and 2008 and report critical technologies developed for achieving acceptable reliability while reducing friction. A unique multiple link mechanism eliminated all coil springs except for the valve springs and continuously varies valve events and valve lift at high speeds of more than 7,000 rpm. Under normal operation, valve train friction could be reduced by about 50 percent compared to a conventional valve train. This chapter reports the design features of the VVEL with a multiple link mechanism and tribological solution techniques. The chapter consists of 11 pages including 14 figures.