BMW N55 Engine for Sale | N55B30 3.0L Single Twin-Scroll Turbo Inline-6

Description

About the Used BMW N55 Engine

The BMW N55 engine, renowned for its performance and reliability, is a standout in the world of automotive engineering. This inline-six engine, featuring a single twin-scroll turbocharger, delivers impressive power and smooth performance, making it a favorite among car enthusiasts, tuners, and BMW owners looking for an N55 crate engine for their next project. Whether you’re seeking an N55 motor for sale to repower a 335i, 535i, X5 35i, or you’re sourcing the legendary 1 Series M Coupe (1M) variant, this engine offers exceptional versatility and durability.

With advanced technologies such as Valvetronic variable valve lift, Double-VANOS variable cam timing, and high-pressure direct injection, the N55 engine provides optimal efficiency and responsiveness. It produces robust 300 to 320 hp and 300 to 330 lb-ft of torque, with the lower-end torque coming on at just 1,300 RPM and holding steady through 5,000 RPM, ensuring a thrilling driving experience from launch through cruising. Perfect for performance builds or as a replacement for your existing BMW N55 engine, this powerplant promises reliability and longevity when properly maintained.

Key Features of the BMW N55 Engine

The BMW N55 engine is a pinnacle of modern engineering, known for its power, efficiency, and advanced technology. Key features include:

• Single Twin-Scroll Turbocharger: Enhances performance and reduces turbo lag, delivering smooth and immediate power. The single-turbo design replaces the more complex twin-turbo configuration of the predecessor N54.

• Valvetronic Technology: BMW’s continuously variable intake valve lift system optimizes efficiency and power output without a traditional throttle plate, providing a responsive driving experience and improved fuel economy.

• Double-VANOS: Variable camshaft timing on both intake and exhaust adjusts for improved torque, fuel efficiency, and emissions across the entire RPM range.

• Lightweight Aluminum Construction: Aluminum block and head reduces weight, enhancing vehicle performance, handling, and chassis weight balance.

• High-Pressure Direct Fuel Injection: Ensures precise fuel delivery at up to 200 bar of pressure for maximum power and efficiency.

• Closed-Deck Aluminum Block: Stronger than open-deck designs, supporting higher boost pressures in tuned applications.

Ideal for enthusiasts seeking an N55 crate engine for custom builds or as a reliable replacement, the BMW N55 engine for sale is perfect for elevating your driving experience. Its combination of innovative features and proven reliability makes it a top choice in the competitive BMW used engine market.

N55 Variants by Application

Signs You Need a Replacement N55

• Knock or rattle on cold start (rod or main bearing wear)

• Loss of compression on one or more cylinders

• HPFP (high-pressure fuel pump) failure causing hesitation or no-start condition

• Wastegate rattle (a known N55 weakness)

• Misfires under load (failed coil pack, injector, or HPFP)

• Excessive oil consumption

• Coolant in oil or oil in coolant (head gasket failure or charge pipe boost leak)

• Engine seized in donor vehicle

• Building a 335i / 535i / X3 35i swap or repower project

Known N55 Issues We Inspect Before Shipping

• HPFP (High Pressure Fuel Pump) wear: A known N55 weakness inherited from the N54 platform, though improved over time. We document HPFP function status.

• Wastegate rattle: A known issue on aged N55 turbos. We listen for wastegate rattle on cold start and document.

• Charge pipe (factory plastic) failure: The factory plastic charge pipe is known to crack under boost. We note this on shipped engines (the charge pipe is external and not part of the long block).

• Carbon buildup on intake valves: Direct injection engines like the N55 are prone to carbon buildup on intake valve backsides. We assess and recommend walnut blast service before installation in most cases.

• Valve cover gasket leaks: Common N55 oil leak source. We inspect and disclose.

• Oil filter housing gasket leaks: Another common N55 oil leak. Inspected before shipping.

What Is Included, What Is Not Included