Harley-Davidson Screamin’ Eagle Engine Units New Document

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For those who’ve ever puzzled how Harley’s doing with their engines, sit down for a bit; we’ve acquired a press launch celebrating that Harley’s simply gone and set a brand new benchmark for efficiency – and never simply their very own efficiency, however all American V-Twin efficiency. 

Apparently, their latest brainchild – the Screamin’ Eagle® 135ci Stage IV Efficiency Crate Engine (little bit of a mouthful) – is constructed for 2021-later fashions, and reveals off “probably the most displacement, and probably the most energy, ever created by Harley-Davidson for a street-compliant crate engine.”

The Screamin' Eagle® 135ci Stage IV Performance Crate Engine. Media sourced from Harley's press release.
 The Screamin’ Eagle® 135ci Stage IV Efficiency Crate Engine. Media sourced from Harley’s press launch.

That’s a hefty title – and, as you’ll be able to see from the curve specs above, it’s a title well-earned. Some fast maths on these 135 cubic inches afford a surprising 2212cc with 143lb-ft of rear-wheel torque @ 3500rpm and 130 rear-wheel ponies @ 5500rpm.

That’s round 28% extra yank (and 41% extra ponies) than the model’s 1,923cc Milwaukee-Eight® 117 coronary heart.

Yikes.

The Screamin' Eagle® 135ci Stage IV Performance Crate Engine. Media sourced from Harley's press release.
 The Screamin’ Eagle® 135ci Stage IV Efficiency Crate Engine. Media sourced from Harley’s press launch.

To prime all of it off, this engine can also be purportedly “the one tuner out there to maximise efficiency whereas being emissions and guarantee compliant” – one thing we can be wanting to check out for ourselves when the engine begins the trickle into manufacturing fashions.

What number of cc’s is your consolation zone? Have a look under on the parts record in the event you’re curious, and tell us what you suppose.

Screamin’ Eagle® 135ci Stage IV Efficiency Crate Engine Componentry

  • New 68mm throttle physique and matching CNC-machined consumption manifold, initially developed for Harley-Davidson Screamin’ Eagle manufacturing unit racing staff engines, to maximise airflow to the engine.

  • Screamin’ Eagle Excessive CNC-ported cylinder heads present considerably improved effectivity of cylinder filling, resulting in extra explosive energy and elevated rear-wheel torque when in comparison with inventory. Excessive-performance valve springs stay steady with the high-lift cam and in high-RPM operation.

  • Screamin’ Eagle Professional Billet Cam Plate and Oil Pump gives increased strain when the oil is scorching to maintain strain drops to a minimal.

  • New 10.7:1 high-compression solid pistons.

    See additionally

    Norden's all-new 2023 Norden 901 Expedition model. Media sourced from Husqvarna.

  • SE8-517 high-lift camshaft, high-performance cam bearing and high-performance tappets.

  • Patent-protected 4.31-inch metal sleeve cylinders and new 4 5/8-inch flywheel (bore x stroke is 4.31 x 4.625).

  • New high-capacity 6.8 gram/second gasoline injectors.

  • Screamin’ Eagle Ventilator Excessive Air Cleaner and Screamin’ Eagle Avenue Cannon mufflers (every offered individually) usually are not required however are extremely advisable for peak efficiency.

*Media sourced from Harley’s press launch*

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