BMW M Engine Ignition Tech: How Does It Work?
BMW M Engine Ignition Tech: How Does It Work?
https://www.motor1.com/news/795357/new-bmw-m-engine-ignition-technology/
Publish Date: 2026-05-10 12:01:00
Source Domain: www.motor1.com
- BMW has new pre-chamber combustion technology entering production.
- The technology will appear on the M2, M3, and M4 starting this year.
- It is called M Ignite and is designed for BMW’s inline-six engines to meet Euro 7 emissions regulations.
BMW says it will begin series production of a new pre-chamber ignition system known as “BMW M Ignite” starting in mid-2026. The technology, patented in 2024 and developed from motorsports applications, will first appear in the inline-six engines of the BMW M2, M3, and M4. The goal is improved efficiency under high load, along with meeting the Euro 7 emissions standard set to take effect in November 2026.
At the heart of the BMW M Ignite technology is a newly integrated pre-chamber in the cylinder head. It’s connected to the main combustion chamber via transfer ports. The pre-chamber has its own spark plug and ignition coil, effectively giving the engine two ignition systems.
At low and mid engine speeds, combustion continues to rely primarily on the conventional spark plug in the main chamber. Only at higher rpm and load conditions does the pre-chamber ignition take on the central role. In this mode, part of the air-fuel mixture is directed into the pre-chamber and ignited there. The resulting flames then shoot at high speed through the transfer channels into the main chamber.
Photo by: BMW
These so-called ignition jets ignite the mixture in the main chamber at multiple points simultaneously. According to BMW, this significantly increases the combustion rate while reducing the risk of uncontrolled self-ignition—commonly referred to as knock. Another claimed benefit is lower exhaust gas temperatures, which should help reduce thermal stress and improve emissions performance.
Along with the pre-chamber ignition, BMW’s inline-six engines will receive…
