When it comes to owning a BMW, choosing the right engine is of utmost importance. With the N55 and B58 engines both vying for your attention, it can be a daunting task to make the right decision.
The N55 engine, a mainstay in BMW’s lineup for over a decade, has proven to be a reliable and versatile powerplant. On the other hand, the newer B58 engine has garnered a lot of attention with its impressive performance and advanced technology.
To make an informed decision, it’s important to have a comprehensive understanding of both engines.
The N55 engine, introduced in 2009, is a turbocharged inline-six engine that delivers a maximum output of 320 horsepower and 330 lb-ft of torque. It has been used in various BMW models, including the 135i, 335i, and 535i.
On the other hand, the B58 engine is a more recent addition to BMW’s engine lineup and is featured in models like the M240i, 340i, and 740i. This engine boasts a maximum output of 382 horsepower and 369 lb-ft of torque, making it a clear contender for performance enthusiasts.
With all of this information in mind, the purpose of this article is to provide you with an in-depth comparison of the N55 and B58 engines. We’ll be highlighting their differences in terms of performance, reliability, and technology.
By the end of this article, you will have a better understanding of which engine is best suited for your BMW, based on your needs and preferences.
Table of Contents
- The N55 Engine
- The B58 Engine
- N55 vs B58 Engines – What are the Differences?
- FAQs on N55 vs B58 Engines
- What is the Difference Between N55 and B58 Engines?
- Which Engine is More Powerful Between N55 and B58?
- Which Engine is More Reliable Between N55 and B58?
- Can I Upgrade from an N55 to a B58 Engine?
- How do the N55 and B58 Engines Compare in Terms of Fuel Efficiency?
- Which Engine is Better for Performance and Modifications?
- Which BMW Models Have the N55 and B58 Engines?
- What are the Common Problems with the N55 and B58 Engines?
- Can I Swap an N55 Engine for a B58 Engine in My BMW?
- How do the N55 and B58 Engines Compare to Other BMW Engines?
- Conclusion
The N55 Engine
Brief History of the N55 Engine
The N55 engine made its grand debut in 2009, taking over the reins from the illustrious N54 engine.
BMW initially designed it for the 5 Series GT and 7 Series luxury sedan models, but it wasn’t long before the N55 engine found its way into other models such as the 1 Series, 2 Series, 3 Series, 4 Series, and X5.
The N55 engine’s lineage is rooted in BMW’s legendary inline-six engine, but it received a substantial overhaul to enhance its performance and efficiency.
Technical Specifications of the N55 Engine
The N55 engine boasts a formidable 3.0-liter turbocharged, direct-injection inline-six engine with BMW’s patented Valvetronic system.
This system allows for precise valve control, thereby improving fuel efficiency and lowering emissions. With a maximum output of 320 horsepower and 330 lb-ft of torque, the N55 engine is no slouch when it comes to performance.
Performance Capabilities of the N55 Engine
The N55 engine is renowned for its exceptional reliability and efficiency. Its turbocharged design provides swift acceleration and lightning-fast throttle response. This makes it a preferred choice among driving enthusiasts. Coupled with the fact that it operates smoothly and quietly, even at high speeds, lending a sense of refinement and sophistication to the driving experience.
Pros of the N55 Engine
One of the N55 engine’s most significant advantages is its fuel efficiency, which is a direct result of its direct-injection technology and variable valve timing.
The N55 engine delivers excellent fuel economy while still providing impressive power and performance. Additionally, the N55 engine is durable and built to last, making it a popular choice among BMW owners who desire a reliable, low-maintenance engine.
Cons of the N55 Engine
Just like any other engine, the N55 engine has its downsides. One of its main drawbacks is its vulnerability to carbon buildup, which can lead to performance degradation and potential engine damage over time.
Furthermore, some drivers have reported issues with the N55 engine’s high-pressure fuel pump, which can cause stalling and other engine-related problems.
The B58 Engine
Brief History of the B58 Engine
The B58 engine made its debut in 2015 as a revolutionary replacement to its predecessor, the N55 engine. Its first application was in the 2016 BMW 340i, and it soon found its way into several other BMW models, including the 540i, 640i, X3 M40i, X4 M40i, and X5 xDrive40i.
Originating from BMW’s esteemed inline-six engine lineage, the B58 engine inherited significant enhancements that made it a top-of-the-line performer in terms of power and efficiency. You can also see how the B58 compares to other BMW engines by checking out this post on B58 vs S58.
Technical Specifications of the B58 Engine
The B58 engine flaunts an imposing 3.0-liter turbocharged, direct-injection inline-six engine with BMW’s cutting-edge Valvetronic system.
This sophisticated system affords precise valve control, enhancing fuel efficiency and reducing emissions. With an exceptional output of 382 horsepower and 369 lb-ft of torque, the B58 engine is a mighty and awe-inspiring feat of engineering.
Performance Capabilities of the B58 Engine
The B58 engine has a sophisticated balance of power and finesse, smooth power delivery, unrivaled throttle response, and blistering acceleration.
The engine boasts remarkable low-end torque and linear, predictable power delivery, providing a sense of confidence and control that elevates the driving experience to new heights.
Pros of the B58 Engine
One of the B58 engine’s significant advantages lies in its fuel efficiency, which comes from its advanced direct-injection technology and BMW’s ingenious Efficient Dynamics system.
The B58 engine delivers superior fuel economy while maintaining exceptional power and performance. Furthermore, its durability and reliability make it an attractive option for BMW enthusiasts who require a low-maintenance engine that guarantees consistent results.
Cons of the B58 Engine
The B58 engine is not immune to some drawbacks. Its high cost represents a significant deterrent for some buyers, as it is one of the pricier engines in BMW’s repertoire.
In addition, the engine’s direct-injection system can expose it to carbon buildup that can negatively impact its performance over time. Moreover, the B58 engine’s intricate design can render it arduous and costly to repair if complications arise.
N55 vs B58 Engines – What are the Differences?
| Differences | N55 Engines | B58 Engines |
| Design and Construction | Average reliability, and regular maintenance required | Twin-scroll turbocharger, aluminum cylinder block and cylinder head, integrated exhaust manifold |
| Performance and Power Output | 320-355 horsepower, 300-365 lb-ft of torque | 382-503 horsepower, 369-479 lb-ft of torque |
| Fuel Efficiency | 18-26 MPG combined | 21-27 MPG combined |
| Reliability and Maintenance | Average reliability, regular maintenance required | Above average reliability, regular maintenance required |
| Overall Better Engine | No | Single twin-scroll turbocharger, cast iron cylinder block, and aluminum cylinder head |
FAQs on N55 vs B58 Engines
What is the Difference Between N55 and B58 Engines?
The B58 has a larger displacement and a more advanced design with features such as a closed-deck cylinder block and a variable valve lift system. It also uses a twin-scroll turbocharger, which allows for improved low-end torque and better throttle response compared to the single-scroll turbocharger used in the N55.
Which Engine is More Powerful Between N55 and B58?
The B58 engine is generally more powerful than the N55 engine.
Which Engine is More Reliable Between N55 and B58?
Determining the overall reliability of an engine can be difficult as there are many factors that can influence it. Both the N55 and B58 engines have been generally well-regarded for their reliability, but there have been some reported issues with both.
The N55 engine has been known to experience issues with the high-pressure fuel pump and fuel injectors, while the B58 reliability has had some drawbacks with some reports of timing chain and water pump failures.
However, it is worth noting that these issues have not been widespread and may not affect every engine. Ultimately, the reliability of either engine may depend on factors such as proper maintenance, driving habits, and other variables.
Can I Upgrade from an N55 to a B58 Engine?
Technically, it’s possible to upgrade from an N55 to a B58 engine, but it very involved and costly process. The N55 and B58 engines have different designs, and swapping one for the other would require not only the engine itself but also many of the surrounding components such as the transmission, exhaust, and cooling system.
In addition, the electronics and wiring of the vehicle would likely need to be reconfigured to work with the B58 engine. Due to these factors, a full-engine swap may not be a practical or cost-effective option for most people.
However, there may be other ways to increase the performance of an N55 engine without going to the extent of a full engine swap, such as upgrading the turbocharger, exhaust, or other components.
How do the N55 and B58 Engines Compare in Terms of Fuel Efficiency?
In general, the B58 engine is considered to be more fuel efficient than the N55 engine. This is due to several factors, including the B58 engine’s use of more advanced technology, such as a higher compression ratio and a more efficient turbocharger.
In addition, the B58 engine has been designed to optimize fuel efficiency by utilizing lightweight materials and reducing internal friction.
However, it’s important to note that fuel efficiency can vary depending on many factors, including driving style, road conditions, and vehicle weight. Therefore, while the B58 engine may be more fuel efficient on paper, actual fuel economy may differ in real-world driving situations.
Which Engine is Better for Performance and Modifications?
The N55 engine has been around for longer and has larger aftermarket support, meaning that there are more parts available for it and more established tuning options. This can make it a good choice for those looking to maximize performance on a budget.
On the other hand, the B58 engine has more advanced technology and features more robust construction. This means that a B58 engine tuning can equally provide more power and higher boost levels. It also has a better stock turbocharger and direct injection fuel system, which can make it easier to achieve high power levels.
Ultimately, both engines can be modified to produce impressive levels of power, but the N55 engine may be a better choice for those on a budget, while the B58 engine may be a better choice for those looking to push the limits of performance with more advanced modifications.
Which BMW Models Have the N55 and B58 Engines?
The N55 and B58 engines have been used in various BMW models over the years. Here are some of the most notable models that have been equipped with these engines:
N55 Engine:
- BMW 1 Series (2010-2013)
- BMW 2 Series (2014-2018)
- BMW 3 Series (2011-2015)
- BMW 4 Series (2013-2016)
- BMW 5 Series (2011-2017)
- BMW 6 Series (2011-2018)
- BMW X3 (2011-2017)
- BMW X4 (2014-2018)
- BMW X5 (2011-2013)
- BMW X6 (2011-2014)
B58 Engine:
- BMW 1 Series (2019-present)
- BMW 2 Series (2017-present)
- BMW 3 Series (2016-present)
- BMW 4 Series (2017-present)
- BMW 5 Series (2017-present)
- BMW 6 Series (2018-present)
- BMW 7 Series (2015-present)
- BMW 8 Series (2019-present)
- BMW X3 (2018-present)
- BMW X4 (2019-present)
- BMW X5 (2018-present)
- BMW X6 (2019-present)
- BMW Z4 (2019-present)
It’s worth noting that these engines have gone through various updates and changes throughout their lifespan, so the specific characteristics and performance may vary depending on the year and model of the vehicle.
What are the Common Problems with the N55 and B58 Engines?
Here are some of the most common problems we have noticed with these engines:
N55 Engine:
- High-pressure fuel pump (HPFP) failure, leading to misfires and reduced engine performance
- Wastegate rattle or failure, causing a loss of power or excessive exhaust noise
- Valve cover gasket failure, resulting in oil leaks
- Oil filter housing gasket failure, causing oil leaks
- Timing chain or timing chain tensioner failure, which can result in engine damage
- Coolant leaks due to water pump or thermostat failure
- Carbon buildup on intake valves, leading to rough idling and reduced performance
B58 Engine:
- Timing chain or timing chain tensioner failure, which can result in engine damage
- High-pressure fuel pump (HPFP) failure, leading to misfires and reduced engine performance
- Crankcase ventilation valve failure, causing oil leaks
- Water pump failure, leading to overheating and potential engine damage
- Camshaft bearing ledge wear, causing reduced engine performance or engine failure
- Carbon buildup on intake valves, leading to rough idling and reduced performance
Can I Swap an N55 Engine for a B58 Engine in My BMW?
This is a complex and expensive process that requires a lot of time, effort, and expertise.
To begin with, the B58 engine has a different layout and size than the N55 engine, so the engine bay and other components may need to be modified or replaced to accommodate the new engine.
In addition, the wiring harness, ECU, and other electronics may need to be reconfigured to work with the new engine.
Another consideration is the transmission, as the N55 and B58 engines may use different transmissions or require different modifications to work with the same transmission.
Also, the suspension and braking systems may need to be upgraded to handle the increased power and torque of the B58 engine.
Overall, swapping an N55 engine for a B58 engine is a major undertaking that requires a significant investment of time, money, and expertise.
How do the N55 and B58 Engines Compare to Other BMW Engines?
Comparing the N55 and B58 engines to other BMW engines depends on several factors, including performance, reliability, fuel efficiency, and cost. Here are some of the key differences between these engines and some other BMW engines:
- Compared to the S55 engine: The S55 engine is a high-performance engine used in the BMW M3 and M4. It produces more power than both the N55 and B58 engines, but it also requires more maintenance and may not be as reliable in the long run. Additionally, the S55 engine is significantly more expensive than both the N55 and B58 engines.
- Compared to the N52 engine: The N52 engine is an older BMW engine that was used in various models from 2004 to 2015. It is less powerful than the N55 and B58 engines, but it is also simpler and generally more reliable. The N52 engine is also known for its smooth and refined operation.
- Compared to the N54 engine: The N54 engine was used in various BMW models from 2006 to 2016. It is a turbocharged engine that produces more power than the N55 engine, but it also has a reputation for being less reliable and more expensive to maintain. The N54 engine is also known for its turbo lag and throttle response issues.
- Compared to the M54 engine: The M54 engine was used in various BMW models from 2000 to 2006. It is a naturally aspirated engine that is less powerful than both the N55 and B58 engines, but it is also simpler and generally more reliable. The M54 engine is known for its smooth operation and good fuel efficiency.
Overall, the N55 and B58 engines are modern, efficient, and relatively reliable engines that offer good performance and reasonable maintenance costs.
Conclusion
The N55 and B58 engines are both powerful and efficient options for BMW enthusiasts. While the N55 engine is a tried-and-true workhorse with a long history of reliable performance, the B58 engine represents a newer and more advanced design with some notable improvements over its predecessor.
In summary, the N55 engine is a dependable and efficient engine that has been used in a wide variety of BMW models over the years. It offers good performance, reasonable maintenance costs, and a solid track record of reliability.
On the other hand, the B58 engine is a more modern and sophisticated engine that delivers improved power, torque, and fuel efficiency, as well as advanced features such as variable valve timing and direct injection.
If you are considering choosing between the N55 and B58 engines, our recommendation would be to carefully consider your priorities and budget.
If you prioritize proven reliability and value, the N55 engine is likely the better choice for you. However, if you are willing to invest in a more advanced and powerful engine with better efficiency, the B58 engine is worth considering.
it’s important to keep in mind that both engines have their strengths and weaknesses, and the decision ultimately comes down to personal preferences and priorities.
Whether you opt for the N55 or the B58 engine, you can rest assured that you are getting a high-quality engine that will provide you with many years of driving pleasure.
