Solenoid-controlled valves could, in theory, have infinite variability without mechanical limitations. A camless engine could run the Atkinson cycle as easily as it could the Otto, have little valve overlap or lots, and run on any or all of its cylinders. But cost, reliability, noise, and other concerns have kept the concept from production. New Cars. Buyer's Guide. Type keyword s to search. Today's Top Stories. If you're a car enthusiast, you've probably heard the term "VTEC" before, but you might not know what it means.
If you don't, here's an explainer. VTEC is a type of variable valve-timing system developed and used by Honda. Like most other variable-valve timing systems , VTEC varies oil pressure to shift between different cam profiles. At higher engine speeds, the cam profile allows greater valve lift, which allows more air into the cylinder.
This helps generate more horsepower. With this type of system, you would get maximum engine performance at every rpm range. Something to look forward to in the future Sign up for our Newsletter!
Mobile Newsletter banner close. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Under the Hood. Engine Performance. This allows more air and fuel to enter and burn, creating stronger torque and horsepower. In any engine, valve timing, duration and lift that optimize performance at low speeds are very different than high RPM needs. The Integra Type R only available in the Japanese market produced an incredible horsepower in a 1.
That engine was rated at more horsepower per liter of displacement than most super-cars at the time. By introducing the option of two camshaft profiles combined with variable valve timing, Honda optimized the performance even further. But in addition, the intake cam can advance from 25 and 50 degrees, optimizing the valve timing for every RPM range.
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