For those who’ve ever puzzled how Harley’s doing with their engines, sit down for a bit; we’ve obtained 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 “essentially the most displacement, and essentially the most energy, ever created by Harley-Davidson for a street-compliant crate engine.”
That’s a hefty title – and, as you possibly can see from the curve specs above, it’s a title well-earned. Some fast maths on these 135 cubic inches afford a shocking 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.
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 will probably be desperate 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 beneath on the elements record in case you’re curious, and tell us what you suppose.
Screamin’ Eagle® 135ci Stage IV Efficiency Crate Engine Componentry
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New 68mm throttle physique and matching CNC-machined consumption manifold, initially developed for Harley-Davidson Screamin’ Eagle manufacturing facility racing workforce engines, to maximise airflow to the engine.
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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 secure with the high-lift cam and in high-RPM operation.
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Screamin’ Eagle Professional Billet Cam Plate and Oil Pump offers greater strain when the oil is scorching to maintain strain drops to a minimal.
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New 10.7:1 high-compression cast pistons.
See additionally
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SE8-517 high-lift camshaft, high-performance cam bearing and high-performance tappets.
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Patent-protected 4.31-inch metal sleeve cylinders and new 4 5/8-inch flywheel (bore x stroke is 4.31 x 4.625).
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New high-capacity 6.8 gram/second gas injectors.
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Screamin’ Eagle Ventilator Excessive Air Cleaner and Screamin’ Eagle Avenue Cannon mufflers (every bought individually) are usually not required however are extremely advisable for peak efficiency.
