BMW announced that M Ignite, a new engine technology patented in 2024, is set to enter series production. The automaker expects the new kind of pre-chamber ignition system for petrol engines to debut in the six-cylinder in-line units for the BMW M2, BMW M3 and BMW M4 from mid-2026.
Rooted in motor sport, the engine's benefits include a significant reduction in fuel consumption under high loads, particularly during track use. It also plays a major role in meeting the requirements of the Euro 7 standard.
BWM identified the pre-chamber positioned within the cylinder head as the centerpiece of the M Ignite technology. It is connected with the cylinder’s main combustion chamber by overflow openings and has its own spark plug and ignition coil, meaning the engine has two ignition systems.
At low and medium revs, the conventional spark plug in the main combustion chamber fires before the spark plug in the pre-chamber. But when the engine is operating under higher revs and loads, the pre-chamber ignition takes over the lead role, with part of the fuel-air mixture channelled through the openings into the pre-chamber also ignited there. The flames generated as a result exit the pre-chamber at around the speed of sound.
BMW
These ignition jets then ignite the mixture in the main combustion chamber above the piston at multiple points at the same time. The result is a significantly higher combustion speed. Meanwhile, the possible cause of uncontrolled combustion is also countered effectively. An additional effect of this technology is a drop in the temperature of the exhaust gas.
Other new technical features alongside the pre-chamber ignition include a higher compression ratio and turbochargers with variable turbine geometry.
BMW M Ignite technology boosts the efficiency of the six-cylinder in-line engines dramatically, especially when the engine is being pushed to its limits. Under high loads, fuel consumption drops substantially, a beneficial feature for BMW M customers who drive their cars on race circuits.
BMW said it would begin production of its M2 featuring the M Ignite technology this August. The displacement and power outputs of all the models with BMW M Ignite technology will be unchanged from those of the corresponding outgoing engines.
