📢 Original: Hon达誌 | JDM Enthusiast Magazine
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Honda's CVCC: A 1970s Tech Now Powering F1 Engines! 🚀

Did you know Honda developed a technology in the 1970s that is now being used in modern F1 engines? 😲

Originally featured in models like the Civic and City, this tech is called CVCC (Compound Vortex Controlled Combustion)—or simply put, a form of stratified combustion.

Honda introduced CVCC in 1972, during the carburetor era, long before modern fuel injection. And while this tech was abandoned with the rise of PGM-FI electronic fuel injection, it's now making a comeback in F1 engines—with new advancements! 🏁🔥

Why Was CVCC Created? 🤔

Many might think CVCC was a performance breakthrough, but in reality, it was Honda’s answer to emissions regulations. 🌿🚗

🔹 Back in 1966, Honda engineers were already researching ways to reduce air pollution.
🔹 The U.S. Muskie Act required strict emissions control, and CVCC became the key to passing these regulations.
🔹 By 1972, Honda successfully developed the CVCC engine, which allowed the Civic to meet U.S. emissions laws without using a catalytic converter—an achievement that shocked the entire automotive industry! 😱

How Does CVCC Work? ⚙️🔥

At its core, CVCC is a stratified combustion system with a main combustion chamber and a secondary pre-chamber.

🛠 How it works:
✔ A richer fuel-air mixture enters the pre-chamber, where it ignites first.
✔ The burning flame then spreads into the main chamber, igniting a much leaner fuel mixture.
✔ This results in a more complete burn, reducing harmful emissions while maintaining fuel efficiency.

💡 Think of it as a controlled “two-stage” combustion process!

The Role of Tokyo University & Diesel Engine Influence 🏫💡

The development of CVCC was inspired by diesel engine pre-chambers. Honda engineers, with guidance from Professor Asanuma Tsuyoshi of Tokyo University, refined the idea into a practical gasoline engine application.

🔹 Diesel pre-chambers were used to preheat fuel, and Honda adapted this concept for better gasoline combustion.
🔹 By 1970, Honda successfully tested a CVCC engine (300cc EA single-cylinder) installed in a modified Honda N600.
🔹 By 1972, Honda officially patented CVCC technology, revolutionizing emissions control.

Why Did CVCC Disappear? 😢

While CVCC was revolutionary, it was ultimately phased out because of electronic fuel injection (EFI).

✔ Carburetors lacked precise fuel control, leading to incomplete combustion.
✔ EFI allowed for exact fuel-air ratio control, eliminating the need for CVCC’s complex pre-chamber design.
✔ By the late 1980s, EFI had replaced CVCC entirely.

BUT… CVCC is now BACK—thanks to F1 engines! 🏎🔥

CVCC’s Return in F1: Why is F1 Using This Tech Again? 🏁

F1 engineers aren’t using CVCC for emissions control—instead, they’re using a similar stratified combustion method to increase engine efficiency! 🚀

🔹 F1 engines operate under extreme pressure and heat.
🔹 To prevent engine knocking, they use stratified combustion to maximize burn efficiency.
🔹 Higher compression ratios + leaner fuel mixtures = more power and efficiency.

💡 In short, modern F1 engines use a refined version of stratified combustion—just like CVCC!

Did Honda Truly Invent CVCC? 🤷‍♂️

Technically speaking… No.

The concept of stratified combustion dates back to Nicolaus Otto, the inventor of the four-stroke engine in 1876!

💡 Otto originally envisioned stratified combustion as a way to make engines run quieter and more efficiently. However, the technology at the time was not advanced enough to implement it.

🚀 It was Honda who perfected and commercialized it as CVCC!

Honda Engineering is More Than Just VTEC! 🚗🔥

Next time someone says "Honda only makes VTEC engines", you can tell them Honda was decades ahead of F1 in combustion technology! 🤯🏁

💬 What do you think? Should stratified combustion be used in modern road cars again? Let us know in the comments! 👇👇👇

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