You have likely heard of variable valve timing by one of the names manufacturers have for the system, such as VVT-i or VTEC. So what is it and what does it do?

Jason Fenske at Engineering Explained put together a video showing exactly how VTEC works, using real Honda engines and visual diagrams. If you want to know what happens inside the engine ...

Read about Aprilia's variable valve timing patent for the V4 engine used in the RSV4 and Tuono V4 here.