42K views · 517 shares | 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 differences. Variable valve lift is used to enhance performance depending on the RPM and load, while variable valve timing is typically used for emissions control (lowering combustion temperatures and thus reducing NOx), but also has performance and efficiency benefits as well. | Engineering Explained | Facebook

VTEC stands for "variable valve timing and lift electronic control." I guess Honda knew VTEC was easier to say than VVTALEC and it probably looks better as a sticker on the side of a car. VTEC allows for differing cam profiles, meaning different valve lift and duration, depending on the engine RPM. This video will dissect a Honda Civic Type R engine to show the ins and outs of how VTEC works. The Type R, unlike many previous performance Honda engines, only has VTEC on the exhaust side, with just