At its core, an internal combustion engine acts like a giant air pump. Standard engines use a camshaft to push valves open against springs, which then snap them closed. This simple system powers everything from lawnmowers to hypercars.
In the 20th century, engineers faced valve float at high RPMs, where springs couldn't rebound fast enough, risking power loss and engine failure. The desmodromic system was devised as a solution. It uses two cam lobes per valve: one to open and another to mechanically close it, eliminating springs and ensuring precise control.
Though conceived in the 1890s, desmodromic technology saw legendary use in the 1950s Mercedes-Benz Silver Arrow F1 car and the 300 SLR. Ducati engineer Fabio Taglioni adopted it for the 125 Grand Prix motorcycle in 1956, making high, reliable revs a brand hallmark. Today, it's primarily found in Ducati models like the Panigale V4.
Despite its high-RPM reliability, the system is rare due to complexity and cost. It requires double the parts, making cylinder heads heavy and expensive to produce and maintain. The mechanical action also creates significant noise and vibration. For most cars operating at lower RPMs, modern high-quality valve springs suffice, rendering the desmodromic solution unnecessary for mass production.