PickVidsI put Koenigsegg’s freevalve tech on a Miata... It runs and drives!
推荐理由
Agreed, but there's also Koenigsegg, which has managed to eliminate the need for cams, and complete heads from ICEs, replacing them with their 'freevalve' tech (which basically replaces the timing chain with computers so that instead of having one or two modes that a camshaft can opt into, you can precisely dial in bespoke timings for every RPM, or every RPM and speed, or ever RPM / speed / gear combination. They've also practically reinvented the transmission to invent a new transmission that eliminates moving gearsets and gives you a dual-clutchish transmission with a 6 speed manual AND a 9 speed automatic in the same device. IIRC, the Freevalve tech is like a 30% efficiency hack for any ICE you put it on, and it's a part of how Koenigsegg are managing to squeeze 600 brake horsepower out of just a 2L, 3-cylinder engine. Wesley Kagan reimplemented their freevalve technology on his Mazda Miata, and it's probably the coolest hobby automotive project I've seen in years. [VIDEO] Here's a really cool explainer on the transmission - [LINK]
强烈推荐bmelton · 原文
说明
这是2021年由Wesley Kagan发布的一部演示，主题归在Cars, EVs & motorcycles。它讲的是camless engine valves这一支里的具体问题，而不是把整个领域扫一遍。适合想看推导、证明或实现细节的人。内容上可以概括成：Hobbyist Wesley Kagan shows his Miata running and driving with a homemade version of Koenigsegg's freevalve camless valve technology. The build uses open CAD files and code and he describes it as an ongoing work in progress.这些读者给出的理由，核心是：HN commenters cite it as an impressive hobbyist project and as an example of open-source engine control enabling freevalve retrofits.它贴着当时的技术，看的时候要记得那是那个年份的判断。从2021年到2026年，有1位不同的读者在1个不同月份把它推荐出来，其中明确叫别人去看的有1次。适合先看结果再决定要不要深挖的人。先看它做成了什么。如果已经会了基本定义，就把注意力放在它怎么把camless engine valves变成能跟着复述的例子。
视频信息
- 频道
- Wesley Kagan
- 时长
- 25 分 50 秒
- 发布年份
- 2021