What is variable valve timing with intelligence?
What is variable valve timing with intelligence?
VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 5-valve per cylinder 4A-GE engine. The VVT system is a 2-stage hydraulically controlled cam phasing system.
What is dual variable valve timing with intelligence?
VVTL-i. Variable Valve Timing and Lift with intelligence is an enhanced version of VVT-i that allows control of valve lift to go with the timing control. In a DOHC engine, this is used with two lobes per cylinder that are tuned for low-RPM and high-RPM use respectively.
What does variable cam timing do?
Variable Camshaft Timing (VCT) is an automobile variable valve timing technology developed by Ford. It allows for more optimum engine performance, reduced emissions, and increased fuel efficiency compared to engines with fixed camshafts.
What is the benefit of variable valve timing?
VVT controls the flow of air and exhaust Engine valves control the intake of fresh air and fuel, and the exhaust of combustion gases. VVT and lift systems adjust the timing of the valves to match the operating conditions of the engine. This improves efficiency over a wide range of engine operating speeds.
What causes a VVT solenoid to go bad?
The most common cause of failure for both the VVT switch and the VVT solenoid is a lack of basic maintenance. If your oil is dirty, sludge can clog the screen on the solenoid, causing a failure. If the engine oil level is low, you will also experience problems with VVT operation.
Is variable valve actuation good?
A two valve engine offers better low and mid-range torque as opposed to a four-valve engine which generates better top end performance. Variable Valve Actuation (VVA) makes the engine more flexible, offering better low-end grunt without compromising on top end performance.
What happens when variable valve timing fails?
The main purpose of the VVT solenoid is to adjust the camshaft timing so you will have effective and smooth engine operation at all different RPMs. If it fails, you may find it causing your acceleration to become rough, and it might even cause misfires when accelerating.
