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Freevalve Camless Engine

submitted by RFlagg

7 years 4 months 2 weeks 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...

6 Comments

*promote

Promoting this video and sending it back into the queue for one more try; last queued Sunday, December 18th, 2016 3:57pm PST - promote requested by Mordhaus.

I've heard camless engines don't need starters. They just squirt a bit of fuel into a combustion-cycle (down stroke) cylinder and fire the plug.

They're using port injection, so without the engine turning there's nothing to pull the fuel into the cylinder.

I love all this technology though, I'm a real petrol head but I really do think this is the dying throws of the internal combustion engine. Electric motors just have so many advantages and the disadvantages are disappearing fast.

I've heard camless engines don't need starters. They just squirt a bit of fuel into a combustion-cycle (down stroke) cylinder and fire the plug.

Fransky says...

Sounds great. Those huge startup flames really made me sit up and take notice. I really want to see that.

This seems like a no brainer to use for direct injection, then you would just need enough air for combustion to get things going.

They're using port injection, so without the engine turning there's nothing to pull the fuel into the cylinder.

I love all this technology though, I'm a real petrol head but I really do think this is the dying throws of the internal combustion engine. Electric motors just have so many advantages and the disadvantages are disappearing fast.

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