Introducing the all-new Polaris 850 Patriot, the most powerful snowmobile engine ever built by Polaris, available exclusively on select SnowCheck models and built with pride in the USA. The 850 Patriot builds on the legendary 25-year heritage of Polaris Liberty engines and creates an all-new benchmark for durability, acceleration, and response.
Durability
– All-new, “clean-sheet” design builds on 25 years of Polaris Liberty engine heritage
– Unmatched durability proven through extensive testing in labs and on-snow
– Guaranteed quality: standard 4-year warranty
Acceleration
– In trail sleds: ferocious acceleration
– In deep snow sleds: instantaneous lift
2019 Polaris 850 Indy XC
2019 Polaris 850 Pro RMK
Response
– Low inertia and quickest revving
– Light and flickable feel in all riding conditions
Class-Leading Power
– Industry-leading power-to-weight ratio
– Unmatched throttle response
Designed for Power and Durability
– Increased power but retained responsiveness while ensuring world-class durability.
– Real-world performance based on 25 years of Liberty engine experience
– Bore and stroke selected for lowest inertia and best real-world performance
– Less inertia = Best throttle response and industry-leading handling
New Piston
– New Piston is optimized for reliability and durability.
– +8mm compression height
– +3mm thicker dome
– More contact area with cylinder bore to maximize heat transfer
– PVD-coated steel single-ring design
– High-capacity wrist pin
New Lightweight Crankshaft
– New “Clean-Sheet Design” crankshaft is strong and stiff while maintaining low inertia.
– Larger clutch taper for durability and serviceability
– High capacity bearing and pin design
– Separate crankpins feature high grade steel (Case Carburized SNCM 420H)
New Engine Mounting
– New engine mounting system seamlessly integrates into AXYS® chassis.
Minimizes vibration transmitted to rider
– Provides more consistent center distance to maximize belt life
New Cylinder & Cylinder Head
– Cylinder and cylinder head designs optimized for cooling effectiveness.
– Advanced Cooling System based on Computational Fluid Dynamics, which results in high velocity coolant flow around cylinder bore, combustion chamber, and exhaust valve
– A 6-bolt cylinder structure was optimized through Finite Element Analysis and features a patent-pending exhaust port design featuring high-flow intake and exhaust ports for top engine performance and complete combustion
– One-piece head design allows for structural rigidity, engineered coolant flow, and optimized weight
– Patent-pending combustion chamber design allows for complete combustion and ultimate performance through entire operating range
New Water Bottle with Integrated Thermostat
– Water bottle integrated thermostat maximizes durability and cooling efficiency
– Patent-pending simplified, integrated thermostat design minimizes vibration and maximizes thermostat life
– Self-bleeding cooling system
100 degree T-stat
Integrated by-pass for fast warm-up
New Throttle Body & Throttle Position Sensor
– New, lightweight throttle body features a lightweight, simple, durable design.
– Features a contact-less TPS for reliable, consistent performance
– Permanent set – No adjustment required
Power-Boosting Regulator
Peak Electrical Efficiency
– Power-boosting regulator for quicker starting; delivers maximum electrical power at Idle/Low RPM
– Electrical ECU with faster processor, exhaust valve control integration, and greater input/output
New 3-Stage E-VES-II Exhaust Valve System
– Features a simplified coplanar valve with fewer parts and an EV base that is lightweight, die-cast magnesium
– Improved fit and sealing to the piston and exhaust ports to control exhaust flow and optimize performance
– Optimized water jacket and valve cooling
– Integrated cooling with no external lines
Premium, Integrated Design & Components
– New exhaust system – pipe and resonator – improves flow and sound quality; EGT in full heat-shielded resonator improves calibration control
– New wire harness routing for reliability and serviceability
– New fuel system temp and pressure sensor is an industry-exclusive, patent-pending design that optimizes piston durability, increases control of variability in fueling, improves starting in all conditions, improves diagnostic functionality for easier serviceability, and enhances engine protection modes in the case of low fuel pressure
– New, drive belt designed specifically for the 850 Patriot is optimized for durability and longevity
– New VForce reeds designed specifically for the 850 Patriot feature carbon fiber petals for ultimate performance, and industry-exclusive secondary seal on the inner cage for maximum durability
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