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>Another trick Formula 1 has had for a while, that will soon be seeing adoption into production cars, are camless engines. Valves are operated by electronically
by avs733 10y ago
>Another trick Formula 1 has had for a while, that will soon be seeing adoption into production cars, are camless engines. Valves are operated by electronically-controlled pneumatic actuators. This allows the valves to open and close faster, and makes intermediate states (in between fully closed and fully open) a lot easier. It's also a major reason as to why crank speeds are as high as they are in F1 cars, as they valves can be actuated fast enough to avoid the valve float that would otherwise occur in cammed engines with valve springs. Production cars currently tend to top out around 9450rpm (the 6.3L V12 in the LaFerrari), whereas Formula 1 cars have pushed close to 20,000rpm (though usually 16,000 - 18,000) for quite some time.
Sorry to be a buzzkill but this is not correct
The engines are not camless. However, they are 'spring less' in a traditional sense. In the early 1990's the typical wound wire springs were replaced with pneumatically charged cylinder that functions as the spring. The reason was do to the inability to create wound wire springs that did not encounter harmonic issues as RPM went up and a more efficient valve closing action. However, through all of this, the camshaft itself is retained.This allowed engines to reach over 20k rpm (which sounds unreal) but the current regulations, introduced in 2014, limit them to 15k and they typically run less due to rules that limit fuel flow at higher RPMs.
The Koenisegg on the other hand is absolutely camless technology they call Free valve and it is a marvel. It not only allows control of the profile, overall, but a on a cylinder by cylinder valve by valve basis.
Similar thing with Mercedes' turbo charger. It is split, and it is impressive, but the benefits are more complex simply gaining from placing the compressor and turbine at different ends of the engine (e.g., moving intake charge away from exhaust heat, providing space for an ultra highspeed motor/generator on the turbo shaft) etc.
At the risk of sharing clickbait...there is an argument that current F1 cars are more energy efficient than a tesla (http://www.espn.co.uk/f1/story/_/id/15152695/f1-cars-more-efficient-latest-tesla http://www.espn.co.uk/f1/story/_/id/15152695/f1-cars-more-ef...)
- yborg 10y agoThey are also considerably more expensive than a Tesla. http://raconteur.net/infographics/the-economics-of-formula-1 http://raconteur.net/infographics/the-economics-of-formula-1
- avs733 10y agothey are considerably more expensive than a lot of things...the steering wheel is near a tesla in price.
- ckozlowski 10y ago>there is an argument that current F1 cars are more energy efficient than a tesla It does sound like click-bait, but I see the point they're making there. No one is proposing we all drive F1s, but for that performance regime, under those conditions, F1 is more efficient with it's energy usage in achieving a target output than a Tesla would be. I'm sure that decreases dramatically driving at pedestrian speeds. It reminds me a bit of when I first read about the SR-71's J58 engine. I'm trying to remember where I saw it (I think it was in the book "Skunk Works") in that the SR-71 was actually most efficient running at Mach 3.2 than it was running at lower speeds. Seems counter-intuitive, but like F1, that was the situation for which it was designed.
- nopzor 10y agoYes, the SR-71 was happiest at mach 3+. At these speeds, metal expansion due to heat would seal the airplane frame up too. Designed for its mission. Insanely, it would literally leak fuel on the ground.