889 views

9:06

Watch
- Search Videos
  
  Advanced search »
- Submit a New Video
Discuss
About
- Try clicking on the various channels to see videos posted to that channel - if you're into music you can click the Music channel to get more music sifts - go on and explore! Use the "hotness" when you have opened the channel link to get videos that have gotten a lot of votes, or use "newness" to have a look at the new sifts.
  When browsing sifts you like, have a look at the Related Posts list to see other related videos, click the tags under the video title to see more sifts tagged with the same tags or have a look at other sifts from the same user in the More Posts By list. If the sifted video is in a play list, have a look at the play list to see other interesting videos the Sift users have linked together.
  Enter the Sift Lounge to chat with online sifters about anything and everything, or read interesting posts in the Sift Talk forum.
  The Top New Videos list is always full of interesting, current videos. It is always recommended that you have a look through the Top New Videos, but also have a look at these:
  - Upcoming Unsifted Videos - active video submissions that neither are published to the front page nor archived to the submitter's personal queue
- Have you seen a really funny, surprising, scary, interesting, cute or in any other way extra good quality video?
  Post and share it here - VideoSift is the best video aggregator on the Web, where we share, discuss, promote, and interact with the best videos out there on the web. Post it here, and share it with the large community of video-interested users. And - you are guaranteed to find more very good videos here already!
  Mind you, we only share videos you discover that someone else has made; if you "self link," by posting a video you have made, have posted or have interests in, you risk the ban hammer - read the posting guidelines before posting. The sift is NOT for promoting your own videos - it is for sharing videos others have made.
  Submit a Video Now »
Login

Freevalve Camless Engine

submitted by RFlagg

8 years 1 week ago

Christian Von Koenigsegg plans on abandoning the cam to control pistons, instead of going with pneumatic actuators and software to control each valve independently. He claims it can be cheaper to make, saves weight (15 to 20 kilos) and height/width/depth, increase in horsepower (45%) and torque (47%), saves fuel (15%) and emissions (35%)... all numbers based on the comparison to the 4 cylinder turbo that they modified to this Freevalve design.

I'm not clear on if this is meant to become mass market eventually, for performance enhancement, or what. If this works as well as he claims though, then it might do as a good stopgap while we transition to electric.

More on it at Car & Driver: http://blog.caranddriver.com/koenigseggs-camshaft-less-engine-explained-watch-it-in-action-video/ which mentions downsides, which seem mostly noise at the moment, as the others (such as needing an air compressor and another oil pump) are offset (the friction from "driving cams, chains, and spring-loaded valves" is apparently more). I'd think moving to a magnetic system would save noise...