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With in excess of 40 many years of history, BMW’s M badge has extensive represented the pinnacle of efficiency in the buyer motorsport planet. At any time due to the fact the initially M1 debuted, these automobiles have dominated roads and race tracks all more than the world.
Debuting below the hood of the BMW M3 and BMW M4 in 2014, the S55 engine is up coming in line from this prestigious motorsport team.
Returning to their legendary inline-6 design, the S55 represents a go to downsize from the V-8s below the hood of the very last era of M vehicles.
How does the S55 stack up as opposed to preceding offerings? Read through on to find out all about it.
Embracing Turbochargers
In the earlier, the engines powering lots of of BMW’s M cars ended up naturally-aspirated. The M sequence has normally managed a devoted pursuing of fans who just take terrific delight in their autos and the engines that energy them.
So, when the brand name introduced that a turbo would be coming to the M collection, lovers were being a bit concerned, but a turbo-charged M vehicle represents BMW embracing present day design aspects. It truly is a change towards more compact sort components, improved fuel economic system, and decreased emissions with the BMW general performance elements you’ve grown to trust.
The S55 isn’t BMW’s initial I6 giving to feature a turbocharger. That distinction belongs to the N55 motor that 1st appeared mated to the F07 5-series Gran Turismo.
The 3. L N55 went on to obtain many accolades. It appeared on Ward’s Prime Ten Engines record for 3 several years in a row and was voted 2014’s Motor of the 12 months in the 2.5-3. L class.
N55 and S55
Following getting this kind of praise for their operate with turbochargers and seeing the automotive landscape shift to smaller engines, it made perception to continue on the trend.
The S55 motor builds on the foundation laid by the N55. They equally feature the exact 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.
However, the S55 packs a punch the N55 are not able to match. Contrary to the N55’s one turbo with twin-electricity know-how, the S55 attributes two traditional turbochargers.
The dissimilarities don’t stop there. The S55 also features Valvetronic technology to make improvements to throttle reaction, lessen gas use, and lessen CO2 emissions. It’s an motor built with an eye towards modern considerations.
Other enhancements involve extra state-of-the-art intercoolers to chill the motor, twin fuel pumps, much better pistons, a substantial-general performance light-weight crankshaft, and a closed-deck motor bay.
Apart from the turbos, the shut-deck design is perhaps the most significant improvement in excess of the N55. It lets for improved electric power output many thanks to larger cylinder strain.
S55 General performance
Many thanks to the twin-turbo configuration, the S55 has an unbelievably even torque output. Though this is legitimate of most turbo-charged cars, the S55 makes it possible for 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 technology is the reason that torque shipping and delivery is so constant across the rev-band.
5500 RPM to 7300 RPM is the engine’s optimal effectiveness band, with its best velocity reachable at 7600 RPM. This engine is capable of delivering both constant torque application and an incredible charge of velocity.
In its inventory configuration, the S55 motor tends to make 425 HP and 406 lb-ft of torque. While these figures are unquestionably extraordinary, it is really able of so significantly extra with a few updates.
The S55 motor also holds the document for the most impressive BMW engine at any time made. BMW tuning brought a closely-modified variation up to 1,150 HP at the wheels.
This engine’s twin turbos each and every generate up to 18 kilos of boost to the cylinders and appear with an electronic wastegate. Many thanks to this style, the motor will not require a blow-off valve.
To make certain oil distribution even under restricted cornering, the S55 also offers a secondary oil pump. This pump pushes oil from the sides of the pan into the engine.
In which To Uncover the S55
The S55 is a hugely-capable motor. It located a dwelling less than the hood of a quantity of generation styles and functionality cars.
In its stock kind, it powers the F80 M3, the F82 M4, and the F83 M4.
A slightly detuned model powers the F87 M2 CS Racing. Right here, it makes involving 275 and 360 HP.
Other purposes in the M2 include things like the F87 M2 Competitors, wherever the engine produces 405 HP, and the F87 M2 CS racing with 444 HP.
On high-efficiency M3s, the S55 can be identified powering the F80 M3 Opposition producing 444 HP and the F80 M3 CS Racing with 453 HP.
Its M4 efficiency purposes contain 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 Winner Edition. The latter two both of those aspect 493 HP many thanks to a drinking water injection procedure.
Is the S55 Trusted?
As the many years go by, the S55 proceeds to prove to be a rather dependable engine. Like all BMW engines, it does at times practical experience problems like significant-force gas pump failure and carbon establish-up, but individuals complications are reasonably scarce.
The only major difficulty that allegedly afflicted a few of these engines was a spun crank hub. Simply because it borrowed the crank hub layout from the N54 and N55 engines, some claimed early editions of the N55 motor experienced crank hub complications.
Having said that, BMW enhanced the style and design of the crank hub in 2016, which appeared to set an conclude to the situation. It turned out that TPG Tuning, an aftermarket areas company, had wildly exaggerated claims in an hard work to offer much more of their merchandise.
Aside from the crank hub scare, the S55 has no big problems to report. Several of these engines are however likely potent much more than 8 decades from their initial production date.
The S55 Powers the BMW M3 and BMW M4
BMW’s S55 motor is an amazing electricity plant. It introduced turbo capabilities to the M sequence when it first appeared in 2014 with the BMW M3 and BMW M4.
It’s an enhancement of the award-winning N55 motor, and it options twin turbochargers and a host of other updates.
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