With over 40 yrs of historical past, BMW’s M badge has extensive represented the pinnacle of efficiency in the client motorsport world. Ever given that the to start with M1 debuted, these cars and trucks have dominated roadways and race tracks all in excess of the world.

Debuting beneath the hood of the BMW M3 and BMW M4 in 2014, the S55 motor is up coming in line from this prestigious motorsport team.

Returning to their legendary inline-6 design and style, the S55 represents a go to downsize from the V-8s under the hood of the past technology of M automobiles. 

How does the S55 stack up when compared to preceding choices? Read through on to find out all about it.

Embracing Turbochargers

In the past, the engines powering lots of of BMW’s M cars and trucks had been by natural means-aspirated. The M sequence has constantly preserved a devoted subsequent of fanatics who acquire good delight in their vehicles and the engines that energy them.

So, when the brand name declared that a turbo would be coming to the M collection, lovers had been a bit anxious, but a turbo-billed M automobile signifies BMW embracing fashionable style factors. It is a shift towards scaled-down type elements, improved gas overall economy, and decrease emissions with the BMW overall performance elements you have grown to rely on.

The S55 is not BMW’s initially I6 offering to element a turbocharger. That distinction belongs to the N55 motor that initial appeared mated to the F07 5-sequence Gran Turismo.

The 3. L N55 went on to receive a lot of accolades. It appeared on Ward’s Prime 10 Engines listing for a few decades in a row and was voted 2014’s Motor of the Calendar year in the 2.5-3. L group.

N55 and S55

Just after obtaining these praise for their function with turbochargers and observing the automotive landscape shift to lesser engines, it made perception to carry on the craze.

The S55 engine builds on the foundation laid by the N55. They the two characteristic the very same 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.

However, the S55 packs a punch the N55 cannot match. Compared with the N55’s solitary turbo with twin-electric power engineering, the S55 capabilities two vintage turbochargers.

The dissimilarities will not quit there. The S55 also functions Valvetronic know-how to make improvements to throttle reaction, reduce fuel intake, and decrease CO2 emissions. It can be an engine developed with an eye towards present day fears.

Other improvements involve more innovative intercoolers to chill the engine, twin gasoline pumps, stronger pistons, a high-efficiency lightweight crankshaft, and a shut-deck engine bay.

Aside from the turbos, the shut-deck style is possibly the most significant improvement around the N55. It will allow for enhanced energy output thanks to better cylinder strain.

S55 General performance

Many thanks to the twin-turbo configuration, the S55 has an incredibly even torque output. Although this is correct of most turbo-billed cars, the S55 enables you to tap into wheel-spinning torque from as lower as 1850 RPM, and delivers it linearly all the way to 5500 RPM.

BMW’s Valvetronic and Double-Vanos engineering is the cause that torque shipping and delivery is so reliable throughout the rev-band.

5500 RPM to 7300 RPM is the engine’s optimal overall performance band, with its best speed reachable at 7600 RPM. This engine is capable of furnishing equally regular torque software and an extraordinary price of speed.

In its inventory configuration, the S55 engine makes 425 HP and 406 lb-ft of torque. Even though these quantities are absolutely remarkable, it is capable of so a lot extra with a number of upgrades.

The S55 motor also holds the record for the most powerful BMW engine at any time built. BMW tuning introduced a seriously-modified model up to 1,150 HP at the wheels.

This engine’s twin turbos every create up to 18 lbs of increase to the cylinders and occur with an electronic wastegate. Thanks to this structure, the motor does not require a blow-off valve.

To assure oil distribution even under tight cornering, the S55 also boasts a secondary oil pump. This pump pushes oil from the sides of the pan into the engine.

Where by To Uncover the S55

The S55 is a extremely-able engine. It located a dwelling less than the hood of a selection of manufacturing versions and effectiveness cars. 

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

A slightly detuned edition powers the F87 M2 CS Racing. In this article, it can make in between 275 and 360 HP.

Other applications in the M2 include the F87 M2 Competitiveness, exactly where the motor produces 405 HP, and the F87 M2 CS racing with 444 HP.

On substantial-efficiency M3s, the S55 can be uncovered powering the F80 M3 Level of competition earning 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 overall performance purposes consist of 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 Edition. The latter two both equally aspect 493 HP thanks to a water injection program.

Is the S55 Reputable?

As the yrs go by, the S55 proceeds to confirm to be a fairly responsible engine. Like all BMW engines, it does at times working experience problems like substantial-strain gasoline pump failure and carbon create-up, but all those troubles are comparatively exceptional.

The only big issue that allegedly influenced a handful of of these engines was a spun crank hub. Because it borrowed the crank hub style and design from the N54 and N55 engines, some claimed early editions of the N55 motor experienced crank hub problems.

Even so, BMW enhanced the design of the crank hub in 2016, which seemed to put an finish to the difficulty. It turned out that TPG Tuning, an aftermarket areas maker, experienced wildly exaggerated promises in an effort and hard work to offer extra of their items.

Aside from the crank hub scare, the S55 has no main issues to report. Quite a few of these engines are nevertheless going potent far more than eight several years from their first production day.

The S55 Powers the BMW M3 and BMW M4

BMW’s S55 motor is an remarkable energy plant. It brought turbo capabilities to the M sequence when it very first appeared in 2014 with the BMW M3 and BMW M4.

It is an advancement of the award-profitable N55 motor, and it features twin turbochargers and a host of other updates.

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