speedkar99

How Variable Valve Timing Works

Ever wonder how variable valve timing works and how it improves performance on your car's engine? In this video, I'll be tearing down both types, the continously variable valve timing electric actuator, and the older, oil control timing camshaft phaser to see what's inside and how it works! Variable valve timing is used to change the angle at which the camshaft lobes contact the valves, and therefore what position the valve valves open at relative to top dead center of the piston. There are three main techniques: 1. During low load, the intake valve delays closing. This pushes air back into the intake, effectively making for a smaller combustion chamber, saving fuel. 2. During high speed, delay the closing of the exhaust valve. This provides a scavenging effect, which pushes more intake air into the cylinder. More air, equals more power. 3. During Constant speed, the intake timing is advanced. This allows some exhaust gases to enter the intake plenum and getting reburned, similar to exhaust gas recirculation, therefore reducing emissions. Timing can be advanced or retarded using an electric motor actuator, with a brush and commutator surface, or oil control valves filling passages inside the gear. Both do have disadvantages as you'll see in the video. For more information on why your car may rattle on cold starts due to the Variable Valve Timing Actuator, see this video teardown: https://www.youtube.com/watch?v=gwJ5BBHb9W4 The engine from this video is a 2.0 turbocharged engine from a 2019 Genesis G70 with a cracked piston. Teardown coming soon! Chapters: 0:00 Introduction to Variable Valve Timing 1:46 How the Electric VVT actuator Works 5:04 Explainer: The different techniques of variable valve timing 6:28 How the Oil Controlled VVT actuator Works 10:13: Variable Valve Lift 11:33 Conclusion: Which one is better? Does your car have the newer, electric style variable valve timing actuator or the older oil controlled style? What problems have you had with the system, if any? Support me on Patreon: patreon.com/speedkar99 This is the Camera I use: https://amzn.to/3oaRcZX (US) https://amzn.to/3KWQ2uU (Canada) I may earn a commission from my Amazon affliates links. Link to Etsy shop where you can purchase speedkar99's brother's socks, t-shirts or hoodies: https://www.etsy.com/ca/shop/Speedkar speedkar9 on Instagram and Tiktok https://www.instagram.com/speedkar9/ https://www.tiktok.com/@speedkar9 speedkar99 on Facebook and Linkedin: https://www.facebook.com/speedkar9/ https://www.linkedin.com/company/speedkar99/ Subscribe for more videos just like this: https://www.youtube.com/subscription_center?add_user=speedkar99