Harley-Davidson’s Screamin’ Eagles factory customs department has unleashed its biggest engine yet, the 131-cube (2147cc) crate motor.
The Screamin’ Eagle Milwaukee Eight 131 Crate Engine features the same 114mm (4.5”) stroke as the 114 Milwaukee Eight, but has been bored out from 101mm (4”) to 109mm (4.31”).
Harley claims it makes 90kW (121hp) of power and 177Nm (131ft-lb) of torque when matched to the Screamin’ Eagle Street Cannon mufflers. It also requires an ECM calibration and Screamin’ Eagle Pro Street Tuner.
That’s a lot of grunt, but still not comparable to the Triumph Rocket 3 which last year went from 2.3 litres to 2.5 litres with 123kW (165hp) at 6000rpm, up 11% over the previous model, and 220Nm (163ft/lb) of peak torque at 4000rpm.
That makes the Trumpy the biggest torque monster of any production bike in the world.
2019 Triumph Rocket 3 TFC
Price and availability
The 131-cube monster, as well as the recently introduced Screamin’ Eagle Milwaukee-Eight 107″/ 114″ and 128″/131” Stage IV Kits, are not in the Aussie 2020 HD catalogue.
However, Harley-Davidson Australia spokesman Keith Waddell says they are “very excited to have these performance parts in ANZ and will provide an update when these parts are available for sale”.
We believe the parts are being homologated.
In the US, the price is $US6195 ($A9000) for the 131 oil-cooled version and $US6395 ($A9360) for the twin-cooled motor.
You could expect to pay around $A10,000 for the Screamin’ Eagle 131 crate motor, given a CVO 117 motor costs about $A7400.
CVO Street Glide Limited wth 117 plant
Screamin’ Eagle 131
Harley’s Screamin’ Eagle Milwaukee Eight 131 Crate Engine bolts straight into 2017 and later Touring models running an oil-cooled or twin-cooled Milwaukee Eight engine.
With a compression ratio of 10:7:1, you will have to be careful on downshifts not to lock the rear wheel.
You will also be paying more to fuel up with high-flow fuel injectors that guzzle fuel at a rate of 5.5-grams a second.
There are bigger accessory motors available for Harley’s and other big twins, but Harley-Davidson Product Manager James Crean says their engine’s raw grunt is matched by factory-made reliability and a 12-month or 24-month factory limited warranty.
It comes in black/chrome or black/gloss black with 131 Stage IV badging on the cylinder heads and timer cover.