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EPISODE 08: M3 & M4 EXPLAINED.EPISODE 08: M3 & M4 EXPLAINED.

EPISODE 08: M3 & M4 EXPLAINED.

4 min reading time

The engines of the BMW M3 & M4.

BMW M engine developer Berti explains the engine details of the new BMW M3 Competition and BMW M4 Competition.

4 February 2021

The epitome of racing feeling in everyday traffic starts a new round. 35 years after the debut of the first BMW M3, BMW M GmbH presents the latest generation of its high-performance automobiles in the premium mid-size segment. Time to introduce the two new vehicles. In the #M3M4explained series, the developers have the floor.

In episode 08, Berti engine developer for BMW M3 and M4 talks about the engine details of the new M automobiles. He also answers questions from the M Community.

ENGINE DETAILS. BMW M3 & M4 EXPLAINED.ENGINE DETAILS. BMW M3 & M4 EXPLAINED.

ENGINE DETAILS. BMW M3 & M4 EXPLAINED.

Start Video

BMW M ENTHUSIASTS ASK, BMW M EXPERTS ANSWER.

The S58 engine.The S58 engine.

How is the crank hub of the S58 different to the one of the S55?

In contrast to the S55's crankshaft, the new S58 crank features solidly forged pinions for the oil pump and camshaft drive chain. The torsional absorber is fixed with 4 screws too.

How is the crankshaft tested? (Torsion etc...)

There are several durability tests being conducted in the car, on the road as well as on an engine dynamometer. One of them is a 400 hour stress test at very high loads and rpms all the time.

How does the main bearing work in the crankshaft?

The main bearings are slide type bearings.

BMW M3 Competition Sedan.BMW M3 Competition Sedan.

What technology was used to cast the crankshaft?

The S58's crankshaft is a forged one.

Does the engine have a sensor to recognize the octane rating of the petrol? (95, 98, 100)

The S58 adjusts to different fuel qualities accordingly.

Is there something like "emotional start" available when starting the engine?

The engine startup differentiates with the 3 different programmes - "Efficient" / "Sport" / "Sport Plus".

What are the tolerances of the rod bearings?

These are about 30 to 70 micrometers.

 BMW M4 badge. BMW M4 badge.

Is material technology the biggest advancement in new engines? Or what else?

BMW engine development does not focus on one single point of view. It is always a combination of the latest technologies, experience, refinement and up-to-date materials.

Which is the compression ratio of the engine? And the turbo pressure?

Compression is 9.3:1 relative boost pressure is 1.7 bar in the Competition models.

Does the S58 have a Valvetronic and Vanos systems?

Yes, it uses the Valvetronic system.

How high can the engine rev in park or neutral?

All the way to its 7200rpm redline.

What are the advantages of having forged pistons?

At given strength and gas pressure requirements they are lighter than cast pistons.

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