With over 40 a long time of record, BMW’s M badge has lengthy represented the pinnacle of overall performance in the shopper motorsport entire world. At any time considering that the first M1 debuted, these autos have dominated streets and race tracks all more than the globe.
Debuting below the hood of the BMW M3 and BMW M4 in 2014, the S55 engine is following in line from this prestigious motorsport team.
Returning to their famous inline-six style and design, the S55 represents a transfer to downsize from the V-8s beneath the hood of the past technology of M cars.
How does the S55 stack up in comparison to prior choices? Read on to learn all about it.
In the past, the engines powering quite a few of BMW’s M cars and trucks have been in a natural way-aspirated. The M series has often managed a devoted adhering to of enthusiasts who just take wonderful satisfaction in their cars and trucks and the engines that electricity them.
So, when the model announced that a turbo would be coming to the M series, lovers were being a little bit worried, but a turbo-charged M automobile signifies BMW embracing modern day structure factors. It is really a shift towards smaller sort aspects, improved fuel economy, and reduced emissions with the BMW performance elements you have developed to have faith in.
The S55 is not BMW’s first I6 presenting to aspect a turbocharger. That difference belongs to the N55 motor that very first appeared mated to the F07 5-series Gran Turismo.
The 3. L N55 went on to receive many accolades. It appeared on Ward’s Prime Ten Engines checklist for 3 several years in a row and was voted 2014’s Engine of the 12 months in the 2.5-3. L category.
N55 and S55
Right after receiving this kind of praise for their get the job done with turbochargers and looking at the automotive landscape change to more compact engines, it built perception to continue on the pattern.
The S55 motor builds on the basis laid by the N55. They both attribute the identical 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.
Nonetheless, the S55 packs a punch the N55 can not match. In contrast to the N55’s solitary turbo with twin-electric power technologies, the S55 options two common turbochargers.
The dissimilarities you should not halt there. The S55 also capabilities Valvetronic technological know-how to increase throttle response, decrease fuel use, and lessen CO2 emissions. It’s an motor built with an eye toward modern worries.
Other improvements include more innovative intercoolers to chill the motor, twin gasoline pumps, much better pistons, a significant-effectiveness lightweight crankshaft, and a shut-deck motor bay.
Apart from the turbos, the shut-deck style is perhaps the most significant advancement in excess of the N55. It permits for improved electrical power output thanks to larger cylinder tension.
Thanks to the twin-turbo configuration, the S55 has an exceptionally even torque output. Whilst this is correct of most turbo-billed cars and trucks, the S55 lets you to faucet into wheel-spinning torque from as lower as 1850 RPM, and provides it linearly all the way to 5500 RPM.
BMW’s Valvetronic and Double-Vanos technological innovation is the motive that torque supply is so constant across the rev-band.
5500 RPM to 7300 RPM is the engine’s optimal general performance band, with its best speed reachable at 7600 RPM. This motor is able of offering each consistent torque application and an unbelievable amount of pace.
In its stock configuration, the S55 engine will make 425 HP and 406 lb-ft of torque. Although these numbers are absolutely outstanding, it truly is capable of so substantially more with a number of upgrades.
The S55 motor also retains the file for the most strong BMW motor ever designed. BMW tuning introduced a greatly-modified edition up to 1,150 HP at the wheels.
This engine’s twin turbos just about every produce up to 18 kilos of boost to the cylinders and arrive with an digital wastegate. Thanks to this structure, the motor will not will need a blow-off valve.
To ensure oil distribution even below restricted cornering, the S55 also features a secondary oil pump. This pump pushes oil from the sides of the pan into the engine.
Where by To Locate the S55
The S55 is a hugely-capable motor. It found a property underneath the hood of a variety of production versions and efficiency cars.
In its inventory sort, it powers the F80 M3, the F82 M4, and the F83 M4.
A a little detuned version powers the F87 M2 CS Racing. Right here, it helps make between 275 and 360 HP.
Other purposes in the M2 include things like the F87 M2 Competition, the place the engine produces 405 HP, and the F87 M2 CS racing with 444 HP.
On high-efficiency M3s, the S55 can be discovered powering the F80 M3 Competition making 444 HP and the F80 M3 CS Racing with 453 HP.
Its M4 effectiveness purposes 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 Winner Edition. The latter two each function 493 HP thanks to a drinking water injection process.
Is the S55 Dependable?
As the yrs go by, the S55 carries on to show to be a quite reputable motor. Like all BMW engines, it does once in a while encounter problems like superior-strain gas pump failure and carbon create-up, but all those challenges are somewhat uncommon.
The only significant issue that allegedly impacted a few of these engines was a spun crank hub. Since it borrowed the crank hub style from the N54 and N55 engines, some claimed early editions of the N55 motor seasoned crank hub challenges.
Nevertheless, BMW improved the style of the crank hub in 2016, which seemed to set an end to the situation. It turned out that TPG Tuning, an aftermarket elements producer, experienced wildly exaggerated statements in an hard work to promote far more of their goods.
Aside from the crank hub scare, the S55 has no main troubles to report. Lots of of these engines are even now heading solid much more than 8 yrs from their first manufacturing date.
The S55 Powers the BMW M3 and BMW M4
BMW’s S55 engine is an remarkable ability plant. It introduced turbo abilities to the M sequence when it initially appeared in 2014 with the BMW M3 and BMW M4.
It really is an advancement of the award-successful N55 engine, and it attributes twin turbochargers and a host of other upgrades.
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