2019 Polaris 850 Patriot Engine 2019 Polaris 850 Patriot Engine
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... 2019 Polaris 850 Patriot Engine

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.

2019 Polaris 850 Patriot

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 Indy XC

2019 Polaris 850 Pro RMK

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

2019 Polaris 850 Patriot

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

2019 Polaris 850 Patriot Crank

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

2019 Polaris 850 Patriot

2019 Polaris 850 Patriot

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

2019 Polaris 850 Patriot

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

2019 Polaris 850 Patriot

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

2019 Polaris 850 Patriot

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

2019 Polaris 850 Patriot

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

2019 Polaris 850 Patriot

Want more articles and content like this? Subscribe to SnowTech Magazine and get all 5 issues delivered right to your door! Like our facebook page to keep up with us online.

You might also like:
2019 Polaris: Coupled Axys, Youth Evo, 850 Patriot
2019 Polaris 850 Patriot
New Model Preview on the 2019 Backcountry X-RS 850
More on the Rotax 900 ACE Turbo
2018.5 Ski-Doo MX Z 600R E-TEC – 500 Mile Test Report
2019 Polaris Indy EVO and EVO ES
Arctic Cat XF 6000 Cross Country Limited – 1,736 Mile Test
2017 Polaris Switchback SP 144? -1,331 Mile Test
2018 Ski-Doo Renegade Backcountry X 850 – 1,000 Mile Test Report
Custom Sled Build: 2017 Yamaha Sidewinder
Poor man’s Snowmobile GPS Solution

  • donthecarpetguy

    March 9, 2018 #1 Author

    Just Snow Checked my 850 SWB XCR ES , Looking forward to riding the best 2-stroke trail sled on the market. I’ve owned a ’14 and ’17 800 and have had zero issues with 7200 trail miles combined. I have no doubt this 850 Patriot engine will far exceed my expectations.

Your email address will not be published. Required fields are marked *

*