Post up observations and comments here on the new mill!
840cc
85mm bore x 74mm stroke
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840cc
85mm bore x 74mm stroke
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850 Engine thread (840cc)
- Thread starter mountainhorse
- Start date
DESIGNED FOR DURABILITY & POWER
- World-class durability with class-leading power and Polaris' renowned responsiveness.
- Real-world performance and reliability based on 25 years of Liberty® engine experience
- Guaranteed quality with standard 4-year warranty
NEW PISTON
- Optimized for reliability and durability.
- +8mm compression height
- +3mm thicker dome
- More contact area with cylinder bore to improve heat transfer
- PVD-coated steel single-ring design
- High-capacity wrist pin
NEW LIGHTWEIGHT CRANKSHAFT
- All-new design is strong and stiff while maintaining low inertia.
- Larger clutch taper design for durability and serviceability
- High capacity bearing and pin design
- Separate crankpins feature high grade steel
- Symmetrical press fit webs for improved straightness
NEW CYLINDER & CYLINDER HEAD
All-new design optimized for maximum durability.
- Advanced Cooling System based on Computational Fluid Dynamics which results in consistent flow velocities
- 6-bolt cylinder structure optimized through Finite Element Analysis and features a patent-pending exhaust port design
- 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
All-new design maximizes durability and cooling efficiency.
- Patent-pending simplified coolant bottle design minimizes vibration and maximizes thermostat life
- Self-bleeding cooling system
- 100 degree T-stat
- Integrated by-pass for fast warm-up
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NEW ENGINE MOUNTING
- Seamlessly integrates into 2019 AXYS® chassis.
- Minimizes vibration transmitted to rider
- Provides more consistent center distance to maximize belt life
NEW THROTTLE BODY & THROTTLE POSITION SENSOR
- Features a lightweight, simple, durable design.
- Contact-less TPS for reliable, consistent performance
- Permanent set - no adjustment required
- NEW 3-STAGE E-VES-II EXHAUST VALVE SYSTEM
- Simplified co-planar valve with fewer parts and EV base that is lightweight, die-cast magnesium
- Improved fit and sealing to 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
- Industry-exclusive, patent-pending fuel system temp and pressure sensor optimizes piston durability, increases control of fueling variability, improves starting in all conditions,improves diagnostic functionality for easier serviceability, and enhances engine protection modes in the case of low fuel pressure
- New belt drive 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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I'm pretty stoked they kept the stroke under control at 74mm.... This will help to retain the nimbleness of the sled !
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Just a repost actually... but brought it here for comments etc.
The mounting system.... looks looks a bit more stout than the 800... that keeps packing out and getting loose.... but I wonder if there is ANY kind of adjustability to account for mfg tolerance-stacking or slight changes from crash damages?
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If it ends up being as reliable as they claim I would say they hit a home run. I liked my stock 17 axys better than with the turbo to be honest. With the extra claimed 9hp I would be plenty happy. Seems like they addressed a lot of the concerns as far as the engine mountains, pistons, thermostat, tps, etc. Not motor related but I am curious on the new reliablility of the a arms too.
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Looks like they are getting better at feeback from sensors...
They put on a fuel pressure monitor/control system... Nice for the ECU to be able to control and/or warn you of problems. Will help with digital-wrench diagnostics for problem sleds should they arise.
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They put on a fuel pressure monitor/control system... Nice for the ECU to be able to control and/or warn you of problems. Will help with digital-wrench diagnostics for problem sleds should they arise.
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Larger clutch taper on the 840 power-plant.
Won't interchange with previous models.
From what I hear... the clutch itself is the same...just a 2mm larger taper (34mm compared to 32mm)
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Won't interchange with previous models.
From what I hear... the clutch itself is the same...just a 2mm larger taper (34mm compared to 32mm)
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Rumor mill has this engine at 173hp @ 8000 RPM
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J
I wonder... with Mahle Industries taking over Kukusan-Denki (supplier of the CFi electronics/controls to Polaris) ... If the new pistons are made by Mahle??
I've been a fan of the quality and repeatability of the Mahle pistons... and many are made right here in the USA!
NEW PISTON
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I've been a fan of the quality and repeatability of the Mahle pistons... and many are made right here in the USA!
NEW PISTON
- Optimized for reliability and durability.
- +8mm compression height
- +3mm thicker dome
- More contact area with cylinder bore to improve heat transfer
- PVD-coated steel single-ring design
- High-capacity wrist pin
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mountain
What's your thought about one ring per pistons?
What's your thought about one ring per pistons?
R
wonder who is the manufacturer of this crank. those bronze coloured rods are usually a tell tale sign of the mape brand. high failure rate. i really hope its a fuji but it would most likely have grey (lighter colour) rods if it were.Larger clutch taper on the 840 power-plant.
Won't interchange with previous models.
From what I hear... the clutch itself is the same...just a 2mm larger taper (34mm compared to 32mm)
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