crate engine

Screamin’ Eagle 135ci Stage IV Crate Engine

by Dustin Wheelen from https://www.rideapart.com The Milwaukee-Eight V-Twin produces 143 lb-ft of torque and 130 horsepower. Tens of millions of dollars and countless man-hours go into Harley-Davidson’s King of the Baggers operation. None of those resources go to waste, either, with the Motor Company snatching the KotB crown in 2021 and nearly repeating in 2022. The fruits of the race team’s labor go beyond the circuit as well, with H-D engineers and designers fashioning race-developed parts for brand faithful. Now, Harley brings even more KotB-proven performance to the market with its Screamin’ Eagle 135ci Stage IV crate engine. The new top-dog Milwaukee-Eight V-twin features the same 68mm throttle body and CNC-machined intake manifold originally designed for Kyle and Travis Wyman’s championship-contending Road Glide Special. Screamin’ Eagle Extreme CNC-ported cylinder heads, high-performance valve spring, and an SE8-517 high-lift camshaft take full advantage of the V-twin’s larger 2,212cc volume. Forged pistons shoot through 4.31-inch steel-sleeve cylinders with 4.625 inches of stroke. The 4 5/8-inch flywheel steadies the big-bore M8, while the Screamin’ Eagle Pro Billet Cam Plate and Oil Pump maintain optimal oil pressure. With a 10.7:1 compression ratio and high-flow fuel injectors (6.8 grams/second), the 135 crate engine lays down 143 lb-ft of torque (at 3,500 rpm) and 130 horsepower (at 5500 rpm)—all at the rear wheel. That output eclipses the Bar and Shield’s largest production engine, the Milwaukee-Eight 117, by 28 percent in the torque department and 41 percent in pony power. Harley-Davidson recommends pairing the Stage IV Milwaukee-Eight with Screamin’ Eagle Ventilator Extreme Air Cleaner and Screamin’ Eagle Street Cannon mufflers to achieve those reported power figures. Retailing for $7,999.95, the Screamin’ Eagle 135ci Stage IV Performance Crate Engine comes in a Black or Chrome finish and is compatible with 2021 and later Touring models (sans Trikes). The brand […]

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Harley-Davidson’s Most Powerful Crate Engine Now Available for Softails

by Daniel Patrascu from https://www.autoevolution.com Back in early 2020, Harley-Davidson announced the introduction of the Screamin’ Eagle 131, a V-Twin described as “the biggest, most powerful street-compliant engine Harley-Davidson has ever created.” At a time of its introduction, the engine was advertised as being made specifically for Touring bikes manufactured starting with 2017. Now the Milwaukee bike maker announced the powerplant should work just as good and is available on select Softail models. More specifically, the bolt-in 131 is the perfect replacement for the Milwaukee-Eight engine fitted from the factory on 2018-later model Harley-Davidson Softail motorcycles. “Our adrenaline-seeking riders asked for thrilling power and torque with reliability,” said in a statement Harley-Davidson Product Manager James Crean. “The Screamin’ Eagle 131 Crate Engine delivers exactly that. Developed by the Screamin’ Eagle performance team and factory-assembled at Harley-Davidson Powertrain Operations to ensure the highest quality standards, this high-performance engine is genuine Harley-Davidson.” When the engine was introduced, Harley advertised an output of 121 hp and 131 ft-lb of torque at the rear wheel when paired with Screamin’ Eagle Street Cannon mufflers, but in the Softail configuration we’re told the powerplant would churn out 124 hp and 135 ft-lb of torque, also when combined with Street Cannon mufflers. The numbers were achieved by matching the 4.5-inch stroke of the Milwaukee-Eight 114 engine with new 4.31-inch bore cylinders and fitting high-lift camshaft, high-performance cam bearing, high-compression forged pistons, a 64mm throttle body and intake manifold, and high-flow fuel injectors. Harley offers the engine through authorized dealers and comes in two finish treatments, Black and Chrome or Black and Gloss Black. Making sure everyone know what V-Twin your bike is packing is 131 Stage IV badging on the cylinder heads and timer cover. Harley sells the crate engine from $6,195 for the oil cooled variant

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