With above 40 decades of record, BMW’s M badge has lengthy represented the pinnacle of efficiency in the buyer motorsport planet. At any time considering the fact that the 1st M1 debuted, these cars have dominated streets and race tracks all about the world.
Debuting below 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 and style, the S55 signifies a go to downsize from the V-8s under the hood of the previous era of M autos.
How does the S55 stack up as opposed to past offerings? Browse on to learn all about it.
In the past, the engines powering a lot of of BMW’s M autos were being in a natural way-aspirated. The M sequence has normally taken care of a devoted adhering to of enthusiasts who take good satisfaction in their cars and the engines that electricity them.
So, when the model introduced that a turbo would be coming to the M collection, lovers had been a bit worried, but a turbo-charged M automobile represents BMW embracing modern day design and style factors. It’s a change towards lesser type things, improved gas economic system, and lessen emissions with the BMW functionality sections you have developed to belief.
The S55 isn’t BMW’s to start with I6 presenting to characteristic a turbocharger. That difference belongs to the N55 motor that 1st appeared mated to the F07 5-sequence Gran Turismo.
The 3. L N55 went on to acquire quite a few accolades. It appeared on Ward’s Prime 10 Engines listing for 3 years in a row and was voted 2014’s Motor of the 12 months in the 2.5-3. L group.
N55 and S55
Right after receiving such praise for their perform with turbochargers and observing the automotive landscape shift to smaller engines, it made sense to keep on the trend.
The S55 engine builds on the basis laid by the N55. They both function the same 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.
Even so, the S55 packs a punch the N55 cannot match. In contrast to the N55’s single turbo with twin-power technological know-how, the S55 capabilities two common turbochargers.
The discrepancies really don’t cease there. The S55 also functions Valvetronic know-how to enhance throttle reaction, lessen fuel consumption, and lower CO2 emissions. It can be an motor intended with an eye toward modern concerns.
Other improvements consist of additional highly developed intercoolers to chill the engine, twin gas pumps, stronger pistons, a substantial-efficiency light-weight crankshaft, and a closed-deck engine bay.
Apart from the turbos, the closed-deck design and style is possibly the greatest advancement above the N55. It will allow for enhanced electric power output many thanks to higher cylinder stress.
Many thanks to the twin-turbo configuration, the S55 has an extremely even torque output. While this is legitimate of most turbo-billed autos, the S55 will allow 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 engineering is the purpose that torque shipping is so steady across the rev-band.
5500 RPM to 7300 RPM is the engine’s optimum overall performance band, with its leading velocity reachable at 7600 RPM. This engine is capable of giving both constant torque application and an incredible level of pace.
In its inventory configuration, the S55 motor would make 425 HP and 406 lb-ft of torque. Although these numbers are undoubtedly extraordinary, it is capable of so a lot more with a few upgrades.
The S55 motor also holds the document for the most potent BMW motor at any time produced. BMW tuning brought a greatly-modified model up to 1,150 HP at the wheels.
This engine’s twin turbos each individual make up to 18 lbs . of increase to the cylinders and appear with an electronic wastegate. Many thanks to this layout, the engine isn’t going to require a blow-off valve.
To ensure oil distribution even under limited cornering, the S55 also boasts a secondary oil pump. This pump pushes oil from the sides of the pan into the engine.
Where To Find the S55
The S55 is a highly-able motor. It located a dwelling underneath the hood of a number of manufacturing styles and overall performance autos.
In its inventory form, it powers the F80 M3, the F82 M4, and the F83 M4.
A a bit detuned edition powers the F87 M2 CS Racing. Right here, it can make amongst 275 and 360 HP.
Other apps in the M2 contain the F87 M2 Levels of competition, wherever the motor produces 405 HP, and the F87 M2 CS racing with 444 HP.
On significant-functionality M3s, the S55 can be found powering the F80 M3 Opposition creating 444 HP and the F80 M3 CS Racing with 453 HP.
Its M4 efficiency programs involve the F82 and F83 M4 Levels 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 of those characteristic 493 HP thanks to a drinking water injection process.
Is the S55 Trustworthy?
As the many years move by, the S55 continues to verify to be a quite reliable engine. Like all BMW engines, it does once in a while working experience concerns like substantial-pressure gas pump failure and carbon build-up, but individuals complications are somewhat uncommon.
The only significant concern that allegedly affected a few of these engines was a spun crank hub. Since it borrowed the crank hub layout from the N54 and N55 engines, some claimed early editions of the N55 motor skilled crank hub difficulties.
Nevertheless, BMW improved the style and design of the crank hub in 2016, which seemed to put an conclusion to the problem. It turned out that TPG Tuning, an aftermarket sections company, had wildly exaggerated promises in an work to offer far more of their merchandise.
Apart from the crank hub scare, the S55 has no major concerns to report. Lots of of these engines are nevertheless heading solid a lot more than 8 many years from their original production date.
The S55 Powers the BMW M3 and BMW M4
BMW’s S55 engine is an remarkable electricity plant. It brought turbo abilities to the M series when it initial appeared in 2014 with the BMW M3 and BMW M4.
It truly is an enhancement of the award-profitable N55 engine, and it capabilities twin turbochargers and a host of other upgrades.
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