Engine BMW 1 serie xDrive 135i F20 F21 320 326 Ps N55B30A - marcosengines

1. Engine BMW 1 serie xDrive 135i F20 F21 320 326 Ps N55B30A - marcosengines.com https://www.marcosengines.com/product/engine-bmw-1- serie-xdrive-135i-f20-f21-320-326-ps-n55b30a/ Engine BMW 1 serie xDrive 135i F20 F21 320 326 Ps N55B30A. When it comes to performance, precision, and reliability in the world of compact sports cars, theBMW 1 Series xDrive 135i (F20/F21)equipped with theN55B30A enginestands out as an engineering marvel. This article delves deep into the technical specifications, performance capabilities, and unique characteristics of this turbocharged inline-6 engine. Overview of the BMW 1 Series xDrive 135i (F20/F21) The BMW 135i xDrive, available in both theF20 (5-door)andF21 (3-door)body styles, is part of the second generation of the BMW 1 Series. With xDrive all- wheel-drive technology, this car offers exceptional grip, making it an exciting yet stable driving experience — especially when paired with the powerful N55 engine. What is the N55B30A Engine?

2. TheN55B30Ais a3.0-liter inline-6 turbocharged petrol engine, part of BMW’s celebrated N55 engine family. Introduced as a successor to the twin-turbocharged N54, the N55B30A brings a single twin-scroll turbocharger into the equation for better efficiency and response. Key Specs: •Engine Code: N55B30A •Displacement: 2979 cc (3.0L) •Configuration: Inline-6, DOHC •Induction: Single twin-scroll turbocharger •Power Output: •320 PS (315 hp)in earlier versions •326 PS (322 hp)in later, tuned variants •Torque: Around 450 Nm (332 lb-ft) •Fuel System: Direct injection •Valvetrain: VANOS (variable valve timing) & Valvetronic •Compression Ratio: 10.2:1 Performance Highlights The combination ofxDrive AWD systemand theN55B30A enginegives the 135i F20/F21 outstanding acceleration and handling. Here’s what you can expect: •0–100 km/h (0–62 mph)in approximately4.7 seconds •Top speed limited to250 km/h (155 mph) •Responsive throttleandlinear power delivery •Efficient and reliable turbocharging system

3. Engineering Innovations in the N55B30A BMW’s N55 engine series, particularly the B30A variant, is known for a few standout innovations: 1.Twin-Scroll Turbocharger Unlike the twin-turbo N54, the N55 uses a single twin-scroll turbocharger for quicker spool-up and better low-end torque. 2.Valvetronic and Double-VANOS These technologies ensure optimal airflow and timing, improving both performance and fuel efficiency. 3.Closed-Deck Engine Block Designed for durability, especially when dealing with high boost pressures. 4.Lightweight Construction Aluminum block and head help reduce overall engine weight, contributing to better weight distribution in the car. Applications Beyond the 135i The N55B30A engine wasn’t limited to the 135i. It was also used in: •BMW 335i (F30) •BMW 435i (F32) •BMW X3 xDrive35i •BMW X5 xDrive35i •BMW M135i and M235i (before the M Performance upgrade to the B58)

4. Maintenance & Reliability The N55B30A engine is generally reliable but like all turbocharged engines, it requires regular maintenance. Key areas to watch: •High-pressure fuel pump (HPFP) •Oil leaksaround the valve cover and oil filter housing •Water pump and thermostat failures •Carbon buildupin intake valves (especially with direct injection engines) Regular oil changes (every 7,500–10,000 km), using high-quality synthetic oil, and keeping an eye on coolant and turbo components can extend engine life significantly. Tuning Potential The N55B30A is a favorite among tuners. With a simple ECU remap and supporting mods like an upgraded intercooler, downpipe, and intake, enthusiasts can see gains up to400+ hpwithout sacrificing daily drivability. Popular upgrades include: •JB4 or MHD tuning modules •Wagner or VRSF intercoolers •Catless or sport downpipes •Upgraded charge pipes and blow-off valves N55B30A vs. B58 Successor While theB58 engine(found in newer M140i and Toyota Supra models) eventually replaced the N55, the N55B30A is still widely appreciated for itsmechanical feel,throttle response, andtuning flexibility.

5. Final Thoughts TheBMW 1 Series xDrive 135i F20/F21 with the N55B30A engineis a brilliant blend of compact design and exhilarating power. Whether you’re a fan of stock performance or looking to build a street machine, this powertrain offers a solid foundation for driving enthusiasts. With proper care, this engine can deliver thrills for years — proving once again why BMW's N55 engines continue to earn respect from tuners and drivers alike. FAQs Q: Is the N55B30A engine reliable? A: Yes, it is generally reliable with proper maintenance. Some common issues are related to water pumps, oil leaks, and carbon buildup. Q: Can the N55B30A engine be tuned safely? A: Absolutely. With proper tuning and supporting modifications, the engine can handle up to 400+ hp without compromising reliability. Q: What’s the difference between 320 PS and 326 PS versions? A: Later models received a slight software and mechanical tune-up, boosting output from 320 to 326 PS. Phone:(929) 376-7413 Email: info@marcosengines.com