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A high-rpm engine condition in which the valve lifters lose contact with the cam lobes because the valve springs are not strong enough to overcome the momentum of the various valvetrain components. The onset of valve float prevents higher-rpm operation. Extended periods of valve float will damage the valvetrain.
By delaying the opening of the intake, the duration of the cam will be much shorter. A short duration intake works well with a turbo, but the problem is that sufficient lift is hard to get from such a short duration. This is where high ratio rockers can really pay off. A cam for a turbo engine can delay the intake opening by over 40° compared to an cam for a normally aspirated engine. This makes for much less valve lift when the piston is at peak velocity (somewhere near 75° ATDC), any help to get the valve open faster will make large improvements.
The collection of parts that make the valves operate. The valve train includes the camshaft(s) and all related drive components, the various parts that convert the camshaft's rotary motion into reciprocating motion at the valves, and the valves and their associated parts.
Signifies the total intake and exhaust valves in an engine. For example, a 24-valve V-6 would have 4 valves per cylinder 24/6=4. A 16-valve V-8 would have 2 valves per cylinder 16/8=2. More valves allow the engine to breathe better at high RPM and produce more power.
Vehicle Identification Number (VIN)
Number assigned to a vehicle by the manufacturer primarily for registration and identification purposes (consisting of numerals and letters).
Variable Valve Timing and Electronic Lift Control (VTEC)
Changes intake and exhaust valve timing and lift so that it more closely matches the engine's changing air-fuel needs. The result is maximum torque at all engine speeds and under all driving conditions.
Variable Valve Timing and Electronic Lift Control - Economy (VTEC-E)
Just like the regular VTEC engine but with slight horsepower increase with a better fuel economy.
GM's first continuously variable transmission debuts in Saturn VUE. First SUV in the world to feature a CVT. VTi variable transmissions automatically operate at an infinite number of gear ratios over a wide overall ratio range. VTi allows the engine to run at its most efficient speeds, without sacrificing performance. VTi features a torque converter with GM's patented electronically controlled lockup clutch.
Variable Valve Timing (VVT)
This system continuously adjusts the timing of the intake valves to maximize power at all engine speeds, while reducing fuel consumption and exhaust emissions.
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