Hot Rod

GM's Variable Valve Timing System Performance Test - 15 Degrees Of Separation - Speed Parts Testing

The tough guy in you says to stab that cam in retarded a few degrees for maximum top-end horsepower, while your more practical alter ego suggests advancing it a hair for improved low-end torque and ...
GM Authority

GM Completes Rollout Of Variable Valve Timing In Its Truck Small Block V-8

GM has announced that all V-8 powered Chevrolet and GMC trucks now feature variable valve timing (VVT) for the 2010 model year. A quick trip back to engineering 101 reminds us that VVT is a piston ...
autoevolution

Variable Valve Timing Helps Chevrolets Breathe Better

Getting air in and exhaust gases out of the combustion chamber under all speeds and driving conditions is essential for a car’s fuel efficiency and low emissions. That’s why virtually all Chevrolet ...
Motor Trend

GM V-8 Variable Valve Timing

If all V engines had sported overhead cams since the beginning of automotive time, someone surely would have come up with the brilliant idea of incorporating a single camshaft deep inside the block ...
Autoblog

Popular Mechanics honors GM's 3.9L V6

General Motors’ all-new 3.9L V6 has been honored with a Breakthrough Technology award by Popular Mechanics for its innovative use of variable valve timing in an overhead valve engine. For ages GM has ...
Hosted on MSN

Variable valve lift vs variable valve timing - VVL vs VVT

What is VVL? What is VVT? How does VVL/VVT work? What is variable valve lift? What is variable valve timing? We're going to look at the valvtrain from a 2009 Audi 2.0L I4 Turbo engine to check out the ...
Hot Rod

GM's Variable Valve Timing System Performance Test - 15 Degrees Of Separation - Speed Parts Testing

The tough guy in you says to stab that cam in retarded a few degrees for maximum top-end horsepower, while your more practical alter ego suggests advancing it a hair for improved low-end torque and ...