With about 40 a long time of record, BMW’s M badge has extended represented the pinnacle of effectiveness in the consumer motorsport entire world. Ever because the initial M1 debuted, these vehicles have dominated roads and race tracks all around the earth.

Debuting below the hood of the BMW M3 and BMW M4 in 2014, the S55 motor is following in line from this prestigious motorsport group.

Returning to their legendary inline-six structure, the S55 signifies a move to downsize from the V-8s beneath the hood of the final technology of M autos. 

How does the S55 stack up compared to prior choices? Browse on to understand all about it.

Embracing Turbochargers

In the earlier, the engines powering several of BMW’s M automobiles were being in a natural way-aspirated. The M series has always taken care of a devoted pursuing of lovers who take terrific pride in their vehicles and the engines that energy them.

So, when the brand declared that a turbo would be coming to the M collection, fans ended up a little bit concerned, but a turbo-charged M automobile represents BMW embracing contemporary design elements. It’s a shift towards smaller sized variety components, improved gas overall economy, and reduced emissions with the BMW overall performance elements you have developed to have faith in.

The S55 is just not BMW’s initial I6 featuring to aspect a turbocharger. That distinction belongs to the N55 motor that very first appeared mated to the F07 5-sequence Gran Turismo.

The 3. L N55 went on to get various accolades. It appeared on Ward’s Top rated 10 Engines listing for a few yrs in a row and was voted 2014’s Motor of the 12 months in the 2.5-3. L group.

N55 and S55

Immediately after getting this sort of praise for their get the job done with turbochargers and viewing the automotive landscape change to smaller engines, it manufactured sense to carry on the craze.

The S55 motor builds on the foundation laid by the N55. They both equally function the identical 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.

Having said that, the S55 packs a punch the N55 can’t match. As opposed to the N55’s solitary turbo with twin-electricity know-how, the S55 functions two common turbochargers.

The distinctions will not quit there. The S55 also attributes Valvetronic technologies to increase throttle response, minimize gas consumption, and decreased CO2 emissions. It’s an engine made with an eye toward modern day fears.

Other improvements involve additional superior intercoolers to chill the motor, twin fuel pumps, much better pistons, a large-efficiency light-weight crankshaft, and a closed-deck engine bay.

Aside from the turbos, the closed-deck structure is possibly the major advancement more than the N55. It lets for enhanced energy output many thanks to higher cylinder pressure.

S55 General performance

Many thanks to the twin-turbo configuration, the S55 has an very even torque output. When this is accurate of most turbo-charged cars and trucks, the S55 permits you to tap into wheel-spinning torque from as reduced as 1850 RPM, and delivers it linearly all the way to 5500 RPM.

BMW’s Valvetronic and Double-Vanos know-how is the cause that torque shipping is so reliable across the rev-band.

5500 RPM to 7300 RPM is the engine’s exceptional performance band, with its major velocity reachable at 7600 RPM. This engine is capable of giving the two dependable torque application and an extraordinary price of velocity.

In its inventory configuration, the S55 engine tends to make 425 HP and 406 lb-ft of torque. Though these numbers are definitely remarkable, it is capable of so a lot more with a few upgrades.

The S55 motor also holds the report for the most strong BMW motor at any time created. BMW tuning introduced a intensely-modified version up to 1,150 HP at the wheels.

This engine’s twin turbos every single make up to 18 lbs of improve to the cylinders and come with an electronic wastegate. Thanks to this style and design, the engine will not want a blow-off valve.

To be certain oil distribution even below restricted cornering, the S55 also boasts a secondary oil pump. This pump pushes oil from the sides of the pan into the engine.

Wherever To Uncover the S55

The S55 is a highly-capable motor. It uncovered a house beneath the hood of a selection of generation models and performance automobiles. 

In its stock type, it powers the F80 M3, the F82 M4, and the F83 M4. 

A a little bit detuned edition powers the F87 M2 CS Racing. Here, it helps make involving 275 and 360 HP.

Other applications in the M2 incorporate the F87 M2 Competitors, in which the motor produces 405 HP, and the F87 M2 CS racing with 444 HP.

On higher-functionality M3s, the S55 can be observed powering the F80 M3 Level of competition producing 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 general performance programs involve the F82 and F83 M4 Level of competition with 444 HP, the F83 M4 CS Racing with 453 HP, the F82 M4 GTS, and F83 M4 GTM Champion Version. The latter two both characteristic 493 HP many thanks to a water injection program.

Is the S55 Trustworthy?

As the decades move by, the S55 carries on to demonstrate to be a pretty dependable motor. Like all BMW engines, it does sometimes working experience difficulties like high-force gas pump failure and carbon create-up, but these difficulties are reasonably uncommon.

The only important situation that allegedly influenced a handful of of these engines was a spun crank hub. Because it borrowed the crank hub design and style from the N54 and N55 engines, some claimed early editions of the N55 engine professional crank hub difficulties.

Nevertheless, BMW improved the style and design of the crank hub in 2016, which appeared to put an stop to the difficulty. It turned out that TPG Tuning, an aftermarket components manufacturer, had wildly exaggerated claims in an work to sell extra of their items.

Apart from the crank hub scare, the S55 has no important issues to report. Lots of of these engines are nevertheless heading robust extra than 8 decades from their original generation date.

The S55 Powers the BMW M3 and BMW M4

BMW’s S55 engine is an amazing electricity plant. It introduced turbo abilities to the M series when it very first appeared in 2014 with the BMW M3 and BMW M4.

It can be an enhancement of the award-profitable N55 motor, and it characteristics twin turbochargers and a host of other upgrades.

Want to up grade your BMW 3-collection? UroTuning is your resource for BMW components. Search our selection of products currently.


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By Bethann