If this number were a "0," that would mean it's a new engine that has yet to be revised. This engine is in the top class, which, ironically, is the second-highest tier available.Ĥ: The very last character represents how many redesigns the engine has gone through in its life. The choices range from lowest (K), lower (U), middle (M), upper (O), top (T), and super (S). T: This character represents which "performance class" the engine is in. If this were to read "50," that would make it a 5.0-liter engine. Letters "C" and "D" are for diesel engines, while "E" represents electric motors.Ĥ4: These two numbers represent the displacement. If the engine were to have an "A," it would use gasoline and be mounted transversely. The "B" here means it uses gasoline, and it's mounted longitudinally. The "3" here indicates this engine has received three upgraded features-like direct injection or sequential turbos.ī: The fourth character indicates which type of fuel the engine uses, and whether it's mounted longitudinally or transversely in the car. For example, if this number were "0," that would mean it was the original design. Engines with a "7" here are V12s, and engines with an "8" are V10s.ģ: The third character represents the number of upgrades the engine has gone through. Three- and four-cylinder engines are labeled 3 or 4, respectively. The "6" here, for example, actually means this engine is a V8. Don't be fooled-the digit sometimes doesn't correspond to the number of cylinders. If you see a BMW engine with a "W," that means it was built by an external supplier, not BMW.Ħ: The second character is a number that represents the engine's cylinder count. Most normal, non-M BMW engines carry an "N" designation if they were designed after 2001, while those designed after 2013 are given a "B" designation. This makes sense because this engine is from an M5. "S," in this case, represents an engine designed by BMW’s M division. S: The first letter represents which "engine family" this powerplant comes from. Here's what all of those letters and numbers mean. The engine in the 2018 M5 is a good one: S63B44T4. Here's how to decipher BMW’s engine code names. BMW is a great example-it's been using the same naming scheme for its range of engines for decades. But, as Jason Fenske of Engineering Explained points out in his latest video, these codes usually carry a lot of information. Usually they're just a collection of letters and numbers, indecipherable to the average consumer. Carmakers often give engines internal naming designations to identify them during engineering and production.
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