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BMW N55 Engine

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BMW N55 Engine For Sale

This engine was introduced in the autumn of 2009 and is derived from the 3-liter biturbo N54, from which it differs in the presence of a single turbocharger. The new engine, however, is capable of delivering performance equal to that of the unit presented in 2006. In fact, if on the one hand a turbocharger is missing, on the other hand it is possible to mount and exploit the Valvetronic device, absent in the N54, which allows a more complete management of the opening of the valves, both in timing and in lift. In addition, the only turbocharger used uses twin-scroll technology, which consists in dividing the turbine and the exhaust manifold into two zones, each destined for the exhaust flow of three of the 6 cylinders of the engine. The effect obtained is that of obtaining two exhaust waves which, upon their arrival inside the turbine, do not interfere with each other, causing losses of kinetic energy, and also avoids having gas reflux effects. during the subsequent opening of the intake valve of the same cylinder.


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N55B30 (320 hp / 235 kW)

There is a second variant of this engine, characterized by the highest output values: the maximum power reaches 320 HP between 5800 and 6000 rpm, with a maximum torque of 450 Nm almost constant between 1300 and 4500 rpm. This engine was mounted on: BMW M135i xDrive F20 / F21 (06 / 2012-02 / 2015 ); BMW 640i F12 / F13 (01- 2011 -09/2018); BMW 640i Gran Coupe F06 (03 / 2012-09 / 2018); BMW 740i / 740iL F01 / F02 (06 / 2012-07 / 2015).

N55B30o0 (326 hp / 240 kW)

A further third variant delivers 326 hp of maximum power between 5800 and 6000 rpm, with maximum torque unchanged compared to the version with 6 hp less. This variant is mounted on: BMW M135i / M135i xDrive F20 / F21 (03 / 2015-07 / 2016); BMW M235i F22 (03- 2014 -06/2016); BMW M235i Convertible F23 (03 / 2015-06 / 2016). A fourth variant is that of 340 HP delivered between 5800 rpm and 6500 rpm and 450 Nm developed between 1300 rpm and 5000 rpm (while they are 430 Nm peak for the version with manual gearbox) that equips, starting from September 2013, the 335i and 435i versions fitted with the M Performance Power Kit, which is the official upgrade kit offered by BMW as an aftermarket option of its dedicated M Performance line. This kit, according to BMW, allowed an improvement of 0 "3 in acceleration from 0 to 100 km / h, all with unchanged consumption. At the hardware level, the kit was distinguished by replacing the airbox with one equipped with an additional front hole to ensure a greater air intake volume. In contrast, at the software level, in addition to a specific mapping, it involved more excellent responsiveness of the gas pedal and a much more pronounced exhaust sound release (the so-called "exhaust bubbling" ). It is worth describing separately the characteristics of the top variant of the N55 engines. This variant draws some of the technology from the S55 engine fitted to the BMW M4. This is the case, for example, of the pistons and main bearing shells borrowed. At the same time, the lubrication system, of the dry-sump type (unlike the other N55 engines which have a wet sump instead ), has an unprecedented system of anti- flapping to prevent the engine oil, subjected to centrifugal force during high-speed curves, from triggering empty draft phenomena and compromising the reliability of the engine itself.

Common BMW N55 Engine Problems – Failures & Performance Problems

BMW N55 engine problems are most likely to occur after high mileage or excessive tuning. The most common issues that we have seen on the BMW N55 engine revolve around failures with coils, MAF sensors, and turbos. This can leave you stranded and in need of a new replacement part which isn't always cheap. We will cover what you need to know about these failures and how you can prevent them in the future. If you are having issues with your BMW N55 engine, it is suggested that you either fix the problems yourself or take it to a professional who has experience working on cars. The average cost for all of these repairs will be around $2,000, which is very expensive for most people. If this seems too much money, other options may be cheaper for you to go with, but they require more work. You can check out used or salvage yards to find suitable parts at much lower prices than retail values. These parts may not look visually appealing, but they should work well enough to get you fixed so you can get back on the road. A lot of BMW N55 engine problems are caused by tuning it with an aftermarket chip or tuner. These chips can delete or disable specific sensors, and this can cause MAF errors, coil failures, and boost problems. This will put you at risk of getting stranded on the side of the road, so we suggest staying away from them until you know enough about your car's system to work safely with it. Another thing that is not presented is using cheap generic parts to fix components, especially if they are electrical, because they may burn out very quickly and need to be replaced immediately, which once again can leave you stranded waiting for repairs. One last way to fix these issues yourself is to buy a diagnostic tool like Actron CP9580 Scan Tool. This tool will allow you to use the scanner on your car to check for errors and fix them yourself. This is a handy tool if you have some experience working on cars or are willing to learn how it works so you can get your BMW N55 engine fixed right. If any of these options sound good, below, we have listed all the common BMW N55 engine problems that could be causing this issue with your car, along with the costs and difficulty level things take to replace. Keep in mind that replacing one part may not solve all of these problems because you should do several other costlier repairs. Continue reading below for more information that will help guide you through these issues.

BMW N55 Turbo Failures And Costs

Symptoms: There are three different types of turbo failures with the BMW N55 engine. The first one is caused by a boost buildup which can make it very hard to accelerate and can cause damage to the engine if not fixed immediately. This is due to the wastegate turbine becoming clogged with carbon deposits that build up over time. Another way this can happen is if you hold your foot onto the throttle for too long or more than 20 seconds at high RPMs. This will put extra strain on the charger, exhaust pipes and also cause damage to your turbo as well. If you notice these problems happening, pull over immediately, turn the engine off and call roadside for help.


The first turbo failure is caused by a wastegate that needs to have the turbine cleaned out. You should be able to do this yourself or have it done at your local mechanic shop. This can cost around $300 but will vary depending on where you take it too. If the problem continues, the second type of issue is caused by carbon deposits building up on the turbine blades, which causes them not to spin correctly. The only way to fix this is to replace the turbocharger so expect another $2,000 price tag for these repairs if needed.

BMW N55 MAF Sensor Failures And Costs Symptoms:

Many different BMW N55 MAF problems can cause your car not to run correctly. People's most common mistake is replacing the sensor themselves when they don't know what they are doing. If you notice that your car isn't running right, it t's best to check all of these components before just swapping it out because you could do more damage than good.


If you have determined that the MAF sensor is bad, there are two options for replacement. You can pay $92 at a dealer or about $110 if buying elsewhere. We suggest buying at an auto parts store so you can return it after use if needed for any reason.

BMW N55 Engine Knock Or Ticking Noise And Costs Symptoms:

There are many causes of this problem, but when it comes to the N55 engine, you can have a knock or ticking noise in the machine. This is caused by oil and carbon deposits building up in your pistons, damaging them if not fixed. You will notice a loss of power when accelerating and hear a knocking noise coming from under your hood when driving your car.


To fix this problem, you will need to replace all nine pistons, which costs about $1,000 per cylinder. If you have determined that this is the issue with the BMW N55 engine, it's best to take it to a professional to determine what is replaced before just fixing everything because it will be a lot more expensive in the future.

BMW N55 Engine Replacement Costs Symptoms:

Many different BMW N55 engine problems can lead to a replacement needed down the road. If you keep getting repairs done on your car, it could be time for a new one because this is when the repair costs add up and become much more expensive than buying a newer vehicle. You'll notice that starting your car becomes more challenging over time when experiencing this problem, along with an increase of knocking when accelerating and running rough while driving at high speeds.


The price to replace this engine will depend on how bad yours has become and which model you have. They run anywhere from $3,500 to $5,500 depending on where you take it and if you need to replace other parts along with the engine. The best route is to take your BMW into a dealer and have them look at it first or speak to a professional mechanic that specializes in BMWs so they can diagnose the problem for you before taking any further actions. Resources: BMW Repair Centres