So, if a modern Honda has both, why do people argue about VTEC vs. VVT? Because a standard Toyota or Ford has no way to change valve lift. Only VTEC (and similar systems like Nissan's VVEL or BMW's Valvetronic) can physically open the valves wider.
To understand the difference, you first need to know what an engine’s valvetrain does: it opens and closes the intake and exhaust valves to let air in and fumes out. The timing dictates when this happens; the lift dictates how far the valves open.
To the uninitiated, the difference between VTEC and VVT can be confusing. Are they competitors? Is one better than the other? Does every car have them? difference between vtec and vvt
At low RPM, the valves follow the mild outer lobes. You get smooth idling and good fuel economy. At ~4,500 to 6,000 RPM (depending on the engine), the ECU sends oil pressure into the rocker arms via a locking pin. This pin locks the middle rocker arm to the outer two. Click. Suddenly, the middle rocker arm is forced to follow the massive high-RPM cam lobe. Because it is locked to the outer arms, all three arms are forced to obey the aggressive cam. The valves slam open deeper and longer.
I can provide highly specific details depending on your goals. So, if a modern Honda has both, why
This article will dissect the engineering, the driving experience, and the practical applications of Variable Valve Timing (VVT) and Variable Valve Timing and Lift Electronic Control (VTEC). By the end, you will not only know the difference but also understand why your grocery-getter likely has the former, while screamers like the Honda S2000 rely on the latter.
Designed for fuel efficiency and smooth city driving. High-RPM Lobe: A much larger, more aggressive lobe profile. Only VTEC (and similar systems like Nissan's VVEL
For decades, the heart of the automotive enthusiast’s debate has beaten under the hood of a car. While some argue about turbochargers versus natural aspiration, or rear-wheel drive versus front-wheel drive, there is a more technical, fundamental battle that has raged since the late 20th century:
This is where the famous "VTEC just kicked in, yo!" meme comes from. A VTEC engine has a camshaft with for every two valves (intake and exhaust).