With more than 40 a long time of heritage, BMW’s M badge has lengthy represented the pinnacle of functionality in the customer motorsport planet. At any time given that the first M1 debuted, these autos have dominated streets and race tracks all above the world.
Debuting beneath the hood of the BMW M3 and BMW M4 in 2014, the S55 motor is subsequent in line from this prestigious motorsport group.
Returning to their famous inline-6 design, the S55 signifies a shift to downsize from the V-8s underneath the hood of the final era of M cars.
How does the S55 stack up when compared to prior offerings? Examine on to master all about it.
In the past, the engines powering numerous of BMW’s M automobiles ended up obviously-aspirated. The M collection has usually maintained a devoted pursuing of lovers who choose terrific delight in their vehicles and the engines that ability them.
So, when the brand declared that a turbo would be coming to the M sequence, lovers were being a bit anxious, but a turbo-charged M vehicle signifies BMW embracing fashionable design features. It really is a shift toward smaller sized form elements, enhanced gas financial system, and reduced emissions with the BMW general performance pieces you’ve got grown to belief.
The S55 isn’t BMW’s first I6 offering to characteristic a turbocharger. That distinction belongs to the N55 motor that first appeared mated to the F07 5-collection Gran Turismo.
The 3. L N55 went on to obtain quite a few accolades. It appeared on Ward’s Prime Ten Engines checklist for 3 yrs in a row and was voted 2014’s Motor of the 12 months in the 2.5-3. L class.
N55 and S55
Right after acquiring these kinds of praise for their get the job done with turbochargers and viewing the automotive landscape shift to more compact engines, it manufactured perception to continue the pattern.
The S55 motor builds on the basis laid by the N55. They both of those aspect the similar 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.
Nevertheless, the S55 packs a punch the N55 cannot match. Not like the N55’s solitary turbo with twin-ability technological know-how, the S55 functions two traditional turbochargers.
The variances never stop there. The S55 also characteristics Valvetronic technological innovation to enhance throttle response, lower gas use, and decreased CO2 emissions. It is really an engine created with an eye towards modern day concerns.
Other enhancements involve more innovative intercoolers to chill the motor, twin fuel pumps, more robust pistons, a superior-overall performance light-weight crankshaft, and a shut-deck motor bay.
Aside from the turbos, the shut-deck style is possibly the greatest improvement around the N55. It allows for enhanced electric power output many thanks to bigger cylinder stress.
Thanks to the twin-turbo configuration, the S55 has an amazingly even torque output. Although this is real of most turbo-charged autos, the S55 permits you to tap into wheel-spinning torque from as small as 1850 RPM, and provides it linearly all the way to 5500 RPM.
BMW’s Valvetronic and Double-Vanos technologies is the explanation that torque supply is so reliable across the rev-band.
5500 RPM to 7300 RPM is the engine’s optimal effectiveness band, with its top rated pace reachable at 7600 RPM. This motor is able of furnishing equally consistent torque application and an remarkable rate of speed.
In its stock configuration, the S55 engine helps make 425 HP and 406 lb-ft of torque. Whilst these quantities are surely amazing, it is able of so much more with a handful of upgrades.
The S55 motor also holds the history for the most powerful BMW motor ever created. BMW tuning brought a closely-modified model up to 1,150 HP at the wheels.
This engine’s twin turbos each deliver up to 18 lbs of increase to the cylinders and arrive with an electronic wastegate. Many thanks to this style and design, the motor would not need a blow-off valve.
To assure oil distribution even under limited cornering, the S55 also features a secondary oil pump. This pump pushes oil from the sides of the pan into the engine.
Wherever To Locate the S55
The S55 is a highly-capable motor. It found a property underneath the hood of a quantity of output versions and functionality cars.
In its inventory type, it powers the F80 M3, the F82 M4, and the F83 M4.
A slightly detuned version powers the F87 M2 CS Racing. Below, it makes in between 275 and 360 HP.
Other purposes in the M2 involve the F87 M2 Competitors, the place the engine produces 405 HP, and the F87 M2 CS racing with 444 HP.
On significant-performance M3s, the S55 can be observed powering the F80 M3 Levels of competition making 444 HP and the F80 M3 CS Racing with 453 HP.
Its M4 general performance purposes contain the F82 and F83 M4 Competitiveness with 444 HP, the F83 M4 CS Racing with 453 HP, the F82 M4 GTS, and F83 M4 GTM Winner Edition. The latter two equally function 493 HP thanks to a h2o injection technique.
Is the S55 Dependable?
As the yrs pass by, the S55 carries on to establish to be a pretty dependable motor. Like all BMW engines, it does sometimes knowledge troubles like significant-strain gas pump failure and carbon make-up, but those issues are somewhat exceptional.
The only significant concern that allegedly affected a couple of these engines was a spun crank hub. Mainly because it borrowed the crank hub layout from the N54 and N55 engines, some claimed early editions of the N55 engine experienced crank hub difficulties.
Even so, BMW enhanced the structure of the crank hub in 2016, which appeared to set an conclusion to the concern. It turned out that TPG Tuning, an aftermarket sections producer, had wildly exaggerated claims in an effort and hard work to sell additional of their products.
Apart from the crank hub scare, the S55 has no major difficulties to report. Numerous of these engines are still going powerful a lot more than 8 several years from their first output date.
The S55 Powers the BMW M3 and BMW M4
BMW’s S55 engine is an incredible ability plant. It brought turbo abilities to the M sequence when it initial appeared in 2014 with the BMW M3 and BMW M4.
It’s an advancement of the award-successful N55 motor, and it characteristics twin turbochargers and a host of other updates.
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