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You probably do not know what does “engine valve technology” mean if you are not a car enthusiast. However, you may have already heard of terms like “VVT-i” (on Toyota cars), “VTEC” (for Honda), “VANOS” and “Valvetronic” (for BMW), “VarioCam” (Porsche). These are how each auto maker name its engine valve technology. In this article I would try to discuss some interesting stuffs about this topic.

The internal combustion engine in a modern automobile is a 4-stroke engine, and it has intake and exhaust valves. It is easy to imagine that the optimal timing of the open/close of the valves, should not be fixed under all workloads...

Every month, our articles are read by 1.2 million unique visitors, receiving over 40 million website clicks. We are growing fast, and we thank all supported readers like you.

Today, we are pleased to introduce our new feature: YouWheel Guest Post. It allows you to present your own articles, your opinions, and whatever you are thinking about cars, to our enormous reader base!

What is a Guest Post?

Simply speaking: submit your creation to us, and we will post your work on our website: GuestPost.YouWheel.com; if your article is exceptionally good, we will even feature it on our main blog page. Below are the details:

(a) Submit your article to us

It is easy – send your artic...

McLaren, Ferrari, Lamborghini, Bugatti, Rolls-Royce, Bentley, Pagani, Koenigsegg, Aston Martin, Maserati are some brands that many people cannot afford. However this cannot stop us from examining them from the technical aspect: since they represent the most state-of-the-art technologies in the current automotive industry.

It is hard to judge and rank these exotic car makers, due to the fact that building a car involves lots of different technical areas. In this article, I will try to provide you a high-level holistic view, showing you what is the “house special” for each of them.

McLaren

They are good at car body and chassis design...

The most famous free maintenance program in the auto industry is propably BMW’s 4-year/50k-mile program. However, BMW has “secretly” downgraded the program since last July (see our report here). Basically speaking, if you are the 2nd owner, even your BMW is still within 4yr/50k miles, you are not eligible for the free maintenance any more. However, currently Infiniti starts to offer a similar program in China, for the Q50L sedan.

According to Infiniti China, the factory warranty runs for 48 months/100,000 km. During that period, all routine maintenances are all free...

When you purchase a Tesla Model S in US, it only comes with a free mobile connector as standard. This mobile connector only lets you charge your Model S using the regular 110V household outlet, provides 29 miles of range per hour.

If you want to charge the Model S faster, you need to use Tesla’s Wall Connector, which is installed on a 240 volt circuit, and supplies up to twice the amperage as a regular 110V outlet. However for US market this is not free: it cost you $750 for the parts, plus the installation labor.

We all know Tesla did not do well in China recently. Veronica Wu, Tesla’s former China region president, has resigned last December...