All-New Liquid-Cooled V-Twin to Power Pan America 1250
and Pan America 1250 Special
The Harley-Davidson® Pan America™ 1250 and Pan America™ 1250 Special models are powered by the all-new Revolution® Max 1250 engine, a liquid-cooled V-Twin designed to offer flexible, engaging performance with a broad powerband that builds to a rush of high-RPM power surging through the redline. The Revolution Max 1250 engine has been tuned specifically to deliver desirable power characteristics for the Pan America 1250 and Pan America 1250 Special models, with an emphasis on smooth low-end torque delivery and low-speed throttle control applicable to off-road riding.
“Through its history Harley-Davidson has embraced technological evolution while respecting the heritage of our brand, with engines that produce real-world performance for real-life riders,” said Harley-Davidson Chief Engineer Alex Bozmoski. “The Revolution Max 1250 is a clean-sheet, advanced-design effort that will carry Pan America riders over new horizons with reliability, efficiency, and exciting performance.” A focus on performance and weight reduction drove both vehicle and engine architecture, material choices, and aggressive component design optimization. To minimize overall motorcycle weight the engine is integrated into the vehicle as the central member of the chassis. The use of lightweight materials helps achieve a desirable power-to-weight ratio. The Revolution Max 1250 engine is assembled at the Harley-Davidson Pilgrim Road Powertrain Operations facility in Wisconsin.
Revolution® Max 1250 Engine
Displacement: 1250cc
Bore x Stroke: 4.13 in. (105 mm) x 2.83 in (72 mm)
Horsepower: 150hp
Peak Torque: 94 ft. lbs.
Peak RPM: 9500
Compression Ratio: 13:1
Revolution® Max 1250 Engine Technical Features include:
- V-Twin Architecture*
- Optimized Design for Light Weight*
- Stressed Member Powertrain*
- Liquid Cooling*
Offset Connecting Rod Journals*
The two crankshaft connecting rod journals are offset by 30 degrees. Harley-Davidson leveraged its extensive experience in flat track racing to help inform the cadence of Revolution® Max 1250 engine power pulses.
Forged Aluminum Pistons
Piston crowns are machined for precise control of compression ratio. The 13:1 compression ratio improves engine torque at all speeds. This high compression ratio is made possible by advanced knock detection sensors. The engine will require premium-grade (91 octane) fuel to make maximum power, but will run on lower-octane fuel and is protected from detonation by the knock sensor technology. The base of the piston is chamfered so no piston ring compression tool is required for installation. The piston skirt has a low-friction coating. Low-tension piston rings reduce friction, which improves performance. The top ring land is anodized to enhance durability. Oil cooling jets are aimed at the bottom of the pistons to help dissipate combustion heat.
Four-Valve Cylinder Heads*
- Four-valve cylinder heads (two intake and two exhaust) permit the largest-possible valve area.
Double Overhead Camshafts (DOHC)*
The Revolution Max 1250 engine is equipped with separate intake and exhaust camshafts for each cylinder.
Hydraulic Lash Adjusters
The Revolution® Max 1250 engine features roller-finger valve actuation with hydraulic lash adjusters. This design ensures that the valves and valve actuators (“fingers”) are in constant contact as engine heat changes. The hydraulic lash adjusters make the valve train maintenance-free, saving the owner time and cost – there is no mechanical adjuster. This design realizes a reduction in undesirable valve train noise, especially on cold starts. This design maintains consistent pressure on the valve stem, which facilitates more-aggressive camshaft profiles, which can boost performance.
Variable Valve Timing (VVT)*
The Revolution Max 1250 engine is equipped with computer-controlled Variable Valve Timing (VVT) on both the intake and exhaust camshafts.
Dual Spark Plugs
The Revolution Max 1250 engine is equipped with two spark plugs per cylinder. Dual spark plugs improves ignition of the fuel charge across this wide-bore cylinder. The Revolution® Max 1250 engine is equipped with “dual side strap” spark plugs that are designed to better manage high temperatures in the combustion chambers than a standard spark plug.
Dual Down-Draft Throttle Bodies*
Separate throttle bodies are located between the cylinders, positioned to create minimal turbulence and impedance to airflow.
Robust Oiling System*
The engine oiling system is scaled to perform well in challenging conditions.
Fully Balanced Powertrain*
Internal balancers cancel most engine vibration to enhance rider comfort and improve vehicle durability.
Clutch and Transmission*
The Revolution® Max is a unitized powertrain, meaning that the engine and six-speed transmission are housed in a common case.
* More details on the Revolution Max Engine can be found at the link below blue:
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About Harley-Davidson
Harley-Davidson, Inc. is the parent company of Harley-Davidson Motor Company and Harley-Davidson Financial Services. Our vision: Building our legend and leading our industry through innovation, evolution and emotion. Our mission: More than building machines, we stand for the timeless pursuit of adventure. Freedom for the soul. Since 1903, Harley-Davidson has defined motorcycle culture with an expanding range of leading edge, distinctive and customizable motorcycles in addition to riding experiences and exceptional motorcycle accessories, riding gear and apparel. Harley-Davidson Financial Services provides financing, insurance and other programs to help get Harley-Davidson riders on the road. Learn more at www.H-D.com