Harley-Davidson's reputation for producing incredibly powerful motorcycles has only grown with each new model. The "hog" nickname, originally coined by journalists covering the Wrecking Crew motorcycle racers—a Harley-exclusive team with a piglet mascot—likely stuck due to the bikes' impressive size, roaring sound, and powerful engines.
The Screamin' Eagle Stage IV Performance Crate Engine is, according to Harley-Davidson, "the biggest, most powerful street-compliant crate performance engine" they've ever created. Announced in 2023 as the latest addition to the Screamin' Eagle lineup, this engine features a massive 135ci or 2,122cc volume, packing over two liters of fuel and air in the cylinders.
To truly appreciate its power, you'll need to experience it firsthand at a Harley dealership. This engine delivers 143 lb-ft of torque to the rear wheel, outperforming competitors like Indian Motorcycle's top engine by a significant margin.
The Stage IV is a V-Twin engine, standard for Harley, with pistons arranged at a 45-degree angle, giving it that iconic sound. However, the 135ci volume is anything but standard.
Performance is further enhanced by 6.8g/sec fuel injectors and 4.31" steel sleeve cylinders, finely tuned to the point that Harley patented them. These cylinders are topped with Screamin' Eagle Extreme CNC-ported cylinder heads.
Designed for "wide open throttle," this engine allows for quick acceleration, making highway passing easier and safer. With a rotational speed delivering 130 hp at 5,500 RPM, it's a serious powerhouse.
To put it in perspective, Harley's first model had bicycle pedals to help the 24.74ci, 3hp engine on steep hills. A lot has changed in over a century.
If you're looking to equip your bike with the latest Screamin' Eagle engine, it comes with a price tag of around $8,000. You might spend more if you retrofit it, but for new bikes, you can request the engine at the dealership.
Compatible with 2021-and-later Harley-Davidson Touring models, the engine bolts right on without needing a custom mount. You can check the Harley website to see whether the oil-cooled or Twin-cooled version fits your bike and find a local dealership with the engine in stock.
A two-year manufacturer's warranty is available when a certified dealer installs the engine. If you prefer to do it yourself, Harley provides a technical guide to help you through the process.