M IGNITE
In the quest for maximum efficiency – even in high-performance powertrains – BMW M GmbH is set to introduce a new system for igniting the air-fuel mixture in the series production S58 six-cylinder in-line engines. Patented by BMW, M Ignite is a new pre-chamber ignition system designed to enable a significant reduction in fuel consumption at high revs – without any loss of power.
This new engine technology has its roots in motorsport. It thus demonstrates once again the characteristic BMW M transfer of technology from the racetrack to the road.
TWO SPARK PLUGS PER CYLINDER.
Centrepiece of the combustion process is the new pre-chamber within the cylinder head. It is connected to the cylinder’s main combustion chamber by overflow openings. The pre-chamber 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. At higher revs and loads, the pre-chamber ignition takes over the lead role. In this process, a part of the fuel-air mixture, which is channelled into the pre-chamber through the openings, is ignited there. The flames generated as a result then exit the pre-chamber at around the speed of sound.
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. The possible cause of uncontrolled combustion – known as ‘knocking’ – is also countered effectively. As an additional benefit, there is a drop in the temperature of the exhaust gas.
HIGHER COMPRESSION AND NEW TURBOCHARGERS.
The S58 engine, featuring the new pre-chamber ignition system, achieves higher compression ratio and utilises new exhaust gas turbochargers, which feature variable turbine geometry (VTG) for the first time. Carefully optimised exhaust ports, camshafts and pistons further ensure optimum flow and maximum performance.
POWERFUL PERFORMANCE, POWERFUL SOUND.
POWERFUL PERFORMANCE, POWERFUL SOUND.
The distinctive sound of the six-cylinder in-line engine found in the BMW M2, M3 and M4 models remains unaffected by the new engine technology. On the contrary: thanks to the two ignition systems, the sound becomes even more throaty at higher revs.
M Ignite: full acceleration.
Sound recorded in the engine compartment.
M Ignite: full acceleration.
Sound recorded near the exhaust system.
LONGER DRIVES ON TRACK DAYS.
LONGER DRIVES ON TRACK DAYS.
Thanks to M Ignite, engine efficiency increases dramatically, especially when the engine is being pushed to its limits. Fuel consumption drops substantially under high load. This is a particular advantage for all drivers who take their car out on the racetrack, for example on track days. The reduction in fuel consumption means you get more driving time from the same amount of fuel – without compromising on the high performance of the S58 engine.
READY FOR EURO 7.
READY FOR EURO 7.
As well as improving efficiency, M Ignite also helps to meet the new European Euro 7 standard, which will come into force in November 2026. By transferring technology from motorsport to series-production cars, BMW M is ensuring that the High-Performance models, which are equipped with the popular S58 six-cylinder in-line engine, will continue to meet European registration requirements in the future.
IN SERIES PRODUCTION FROM JULY 2026.
From July 2026, all variants of the BMW M3 and BMW M4 will come with M Ignite technology. Production of the BMW M2 featuring this technology will get underway in August 2026. For all models, the displacement and power outputs will be unchanged from those of the corresponding outgoing engines.
Alexander, as Head of Development at BMW M, how would you explain the new M Ignite to a layman in a single sentence?
With M Ignite, we are transferring combustion engine technology from motorsport to our high-performance road vehicles. With M Ignite in the S58, we are offering our customers a purist combustion engine without hybridisation that meets our high standards for an M powertrain whilst also complying with future regulatory requirements such as Euro 7 in Europe or C7 for the Chinese market.
Does the typical, extremely powerful S58 character remain noticeable with M Ignite, or does the engine’s character change?
The fundamental engine characteristics of the S58 remain unchanged. Through extensive technical modifications, we have succeeded in maintaining the engine’s performance at its familiar high standard and even improving it in certain driving situations, while complying with all legal requirements. The response is now significantly more progressive thanks to the newly integrated exhaust gas turbocharger with variable turbine geometry.
How does M Ignite alter the engine sound, and in which driving situations is this most noticeable?
Feedback on the acoustics of the S58 with M Ignite has been very clear so far: particularly at higher revs and under heavy load, we achieve a more throaty and even more emotive sound. It is precisely in these performance-oriented driving situations that the sporty character of the engine is audibly enhanced.
In the lower rev and load ranges, however, the sound differs hardly at all from the familiar S58. This means the engine retains its familiar characteristics in everyday use, while a clear acoustic improvement is noticeable during dynamic driving.
How does M Ignite differ from a conventional ignition system?
On the order of milliseconds, M Ignite employs a fundamentally different ignition concept to that of a conventional ignition system. Whereas a single flame front originates from the spark plug in a conventional system, with M Ignite the fuel-air mixture is ignited almost simultaneously at several points in the combustion chamber via ignition jets from the pre-chamber.
This virtually synchronous multi-point ignition significantly accelerates combustion and leads to a decisive difference in the result: combustion processes become more stable and efficient, the tendency to knock and exhaust gas temperatures drop noticeably, whilst combustion efficiency increases. Despite a consistently stoichiometric air-fuel ratio (Lambda 1), power and torque figures can be fully maintained – with significant advantages in terms of robustness and thermal control.
What measurable effects does M Ignite have on responsiveness, torque delivery and efficiency – where does the driver notice the new technology most?
The maximum power and torque figures remain unchanged with M Ignite. The key difference, however, becomes apparent in real-world driving – particularly when driving dynamically. The driver benefits from a noticeable reduction in fuel consumption, particularly in the higher rev and load ranges.
Despite significantly stricter legal emissions requirements, including in Europe and China, we have succeeded in achieving a responsiveness that is in no way inferior to that of the previous S58. This has been achieved without additional hybridisation and enables the seamless integration of the powertrain into the existing product portfolio. For the driver, this means: full performance, direct response to accelerator inputs and, at the same time, improved efficiency precisely where sporty driving is practised.
What changes were required in the engine compartment, and what was the most difficult part of the process?
The biggest challenge with M Ignite lay not so much in individual components, but in the seamless integration of the necessary changes into an already highly mature and robust overall system.
The aim was to fully retain the existing range of functions and high reliability – despite the far-reaching technical developments.
On the hardware side, the further development of the S58 comprises the following measures in particular:
- A completely redesigned main ignition system, including a specially developed pre-chamber
- Integration of a second ignition system
- Integration of new turbochargers with variable turbine geometry (VTG)
- Optimisation of the charge exchange via a modified intake camshaft
It was crucial to balance the multitude of changes in such a way that performance, emissions and robustness are equally impressive.
With this development step, the S58 is technically very well equipped to meet upcoming legal requirements as well as future performance demands.
Special thanks go to our colleagues at the engine plant in Steyr. Despite high-capacity utilisation in series production, all necessary adjustments to the base engine and peripherals were carried out there with great flexibility and the highest level of expertise, thereby enabling the successful industrialisation of the S58 with M Ignite.
Is M Ignite a one-off solution for the S58, or a system that could also feature in other BMW M engines in the future?
In an increasingly dynamic market environment with ever-growing regulatory requirements, this concept is, in principle, scalable with a view to the future. For us, however, the current objective is what matters most: with the S58, we are now bringing a production-ready high-performance engine to the road that combines technological innovation with uncompromising driving pleasure. This is exactly what BMW M stands for – and we are proud to now be able to offer our customers this innovative engine technology.
If you had to describe M Ignite in three words – what would they be?
Performance, emotion and efficiency!
Thank you very much for the interview, Alexander!
