BMW Flat-Plane Crank Engines: Power, Precision, and Performance
The BMW flat-plane crank engine represents a bold engineering choice that defines the brand’s commitment to performance and driver engagement. Unlike traditional cross-plane crankshafts, the flat-plane design features shorter connecting rods, reducing rotational inertia and enabling faster revving—key to achieving sharper throttle response and higher RPM capability. This innovation enhances engine responsiveness, offering a more direct and exhilarating driving experience in BMW’s high-performance models.
BMW introduced the flat-plane crank in select M engine variants, where the compact design supports extreme power outputs without sacrificing reliability. The reduced weight of the crankshaft allows for quicker acceleration and improved balance at high speeds, making these engines ideal for sport-tuned transmissions and precision handling. Beyond performance, the distinctive counterweight pattern produces a unique engine sound—one that resonates with the character of BMW’s M division.
For enthusiasts and industry experts alike, the flat-plane crank symbolizes BMW’s pursuit of mechanical excellence. It merges cutting-edge engineering with visceral driving pleasure, setting a benchmark in the luxury performance segment. Whether in the M4, M3, or future models, this technology continues to push boundaries in power delivery and driving dynamics.
Discover how BMW’s flat-plane crank technology transforms every drive—elevate your appreciation for precision engineering in the world’s most iconic sports sedans.
The BMW flat-plane crank isn’t just a mechanical feature—it’s a statement of performance philosophy. By prioritizing speed, responsiveness, and driver connection, BMW has redefined what it means to drive a sport sedan. For those who value precision and power, this engineering marvel underscores why BMW remains at the forefront of automotive excellence. Explore models featuring this groundbreaking technology and experience the future of high-performance driving today.
Building your own flat-plane engine There are many obstacles to building a flat-plane engine. Assuming you can get a custom made flat-plane crank, you still need to get the camshafts to match. The P65B40 is an evolution of the BMW P60B40.
It uses a 180 degree or "flat-plane" crankshaft. Applications: 2008 BMW M3 ALMS [6] 2009 BMW M3 GT2 racing car [7][8]. Our tuned kits have everything you needs to build a flat fast plane crankshaft rotating assembly crank, rods, pistons, camshafts, dampener, and bearings!
The BMW Motorsport P65 race engine as derived from the S65 has a flat plane crank. BMW S65/P65 flat plane crank project for my street car. On the engine dyno, starting up.
Syvecs ECU tuning day. Now power numbers yet. The BMW S65 is more unique and more special-sounding Many people believe that the S65 is a flat-plane crank V8, but it is actually a cross.
In episode 6 of "Mbedded," we get a behind-the-scenes look at the manufacture and testing of the LMDh car's power unit, a twin. For the most part, cross-plane cranks dominate, especially in American V-8 engines, while flat. Flat-plane cranks are used in V-configuration engines, generally with eight cylinders.
[1] Cadillac introduced a V8 flat-plane crank engine in 1923. [2][3] Computer generated image showing the major internal moving parts of a DOHC inline-four engine, including the flat-plane crankshaft Inline-four cylinder engines almost all use flat-plane cranks, and thus are not usually identified as such.