Harley-Davidson has announced its latest Screaming Eagle crate engine for the Milwaukee-Eight platform, with the new anchor measuring in at a huge 135 cubic inches. That’s 2212cc for those of us who use real measurements.
Designed for 2021 or newer Milwaukee-Eight engines, the Stage IV Screamin’ Eagle kit was developed in part by efforts of the Harley-Davidson Screamin’ Eagle factory racing team for their King of the Baggers road racing campaign, and offers the most displacement, and the most powerful, ever created by Harley-Davidson for a street-compliant crate engine.
Engineered and tested as a complete collection of high-performance components and assembled from the bottom up at Harley-Davidson Powertrain Operations in Menomonee Falls, Wisconsin, this street-tuned 2212cc Screamin’ Eagle Crate Engine is designed to run with a wide-open throttle at high engine speeds and provide instant passing power from cruising speed. The engine delivers 193.8 Nm of rear-wheel torque at 3500 RPM and 130 rear-wheel horsepower at 5500 RPM. That translates to approximately 28 per cent more torque and 41 per cent more horsepower at the rear wheel than a production Milwaukee-Eight 117 engine.
That power is achieved not only through the larger displacement of the 135 but also through a range of changes to the design of the Milwaukee-Eight platform.
Compression is bumped up from 10.2:1 to 10.7:1 thanks to new forged pistons, while the engine breathes freely thanks to a new 68mm throttle body and matching CNC-machined intake manifold which was originally developed for the Bagger race engines. The 135 utilises Screamin' Eagle Extreme CNC-ported cylinder heads which help to provide significantly improved efficiency of cylinder filling, leading to more explosive power and increased rear-wheel torque when compared to stock. High-performance valve springs remain stable with the high-lift cam and in high-RPM operation.
Being a factory-supplied crate engine, the 135 is designed to bolt straight into the chassis of 2021 or newer Milwaukee-Eight powered Harley-Davidsons with no special modifications and is also backed by a two-year factory warranty if installed at a Harley-Davidson dealer.
We’ve reached out to Harley-Davidson Australia and New Zealand regarding local availability and pricing, but with US pricing set at $7,999.95 expect to pay a hefty amount of Kiwi dollars if you want the heft of Harley-Davidson’s biggest crate engine to date.