BMW M Found A Way To Make The M3, M4, And M2 Greener Without Touching Power

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A second spark plug, a tiny pre-chamber, and supersonic flame jets are coming to BMW’s improved straight-six turbo engine this summer

6 hours ago

• BMW M Ignite uses race-bred combustion tech to trim fuel use on track.
• System debuts on the M2, M3, and M4 without changing power outputs.
• BMW says track drivers will burn less fuel during hard lapping sessions.

BMW M has unveiled a new combustion technology that sounds like something straight out of endurance racing, and that’s because it did indeed come from motorsport. More exciting, though, is that it’s heading to production cars surprisingly quickly. Called BMW M Ignite, the new setup will debut on all S58 six-cylinder versions of the BMW M2, M3, and M4 beginning later this year.

More: Manhart Found 180 HP BMW Left Sitting In The M5 Touring’s Engine Bay

The general gist of this entire technology is that BMW is going to use pre-chamber combustion to increase fuel efficiency. The setup was patented by the German carmaker in 2024, and the pre-chamber system uses its own dedicated spark plug and ignition coil, effectively giving the engine two ignition systems.

How BMW M Ignite Works

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The details of how it’s doing that are truly fascinating. The cylinder head in M Ignite engines has a small pre-chamber that acts as a secondary space for combustion. Under low and medium loads, the engine behaves mostly like normal. But when revs and loads climb, fuel-air mixture is directed into the pre-chamber where a second spark plug ignites it.

BMW M Ignite Straight-Six Engine Sound

BMW says the resulting flames shoot into the main combustion chamber through tiny openings at roughly the speed of sound, igniting the mixture at multiple points simultaneously. That dramatically increases combustion speed while also helping suppress knocking, one of the biggest challenges in high-performance turbo engines. Exhaust gas temperatures drop as a side benefit.

Built For Euro 7, Not More Horsepower

The technology delivers its biggest gains under sustained heavy loads, especially during track driving. According to BMW, the improved efficiency means drivers can stay out on track longer using the same amount of fuel. Why do this now? Euro 7 emissions standards take effect in Europe next year, and this helps the brand meet those regulations.

BMW isn’t actually the first automaker to bring this kind of technology to a road car, either. Maserati beat it to the punch with the Nettuno V6 found in the Maserati MC20, which debuted in 2020, using a similar Formula 1-inspired pre-chamber combustion system.

While Maserati leaned heavily into the performance side of the tech to help its twin-turbo 3.0-liter V6 produce supercar-worthy output, BMW is clearly taking a different approach. According to the German carmaker, displacement and power outputs will carry over unchanged from the outgoing engines.

Production of the updated M3 and M4 kicks off in July 2026, with the M2 following a month later.

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