850 Engine thread (840cc)
- Thread starter mountainhorse
- Start date
413 for a 155
They have rifled injector nozzles.
Was watching a clip of Burandt riding the 850 and was stopping the clip to read his display- 8350-8400 he was spinning the motor..30 MPH track speed....
FWIW................
FWIW................
Ohhhh, I love cutout engine displays! The TPS thing makes a lot of sense, sounds like you just drop it in and run through a setup procedure. A lot simpler and more accurate. Most automotive systems are like that these days: the ECU learns the sensor. On the injectors, it looks similar to port FI on a 4-stroke where the stream is designed to hit the intake valve, which gives you a cooling effect and helps atomize the fuel. I'm sure there's also a lot of tuning involving the placement and timing of the injector to minimize the amount of fuel that finds it's way into the exhaust. Definitely a case where there's a lot more than meets the eye.
Nothing here... I think that is going to be a hard piece of info to harvest without opening an engine up.
HMM.
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HMM.
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RMK-King
Super-Moderator
Eric Woog "VOHK" talks about the new 850 here, good info. He said it will be modification friendly,I bet its going to be a monster when boosted.
https://www.facebook.com/erik.woog/videos/1806270479418166/
https://www.facebook.com/erik.woog/videos/1806270479418166/
I don't want to sound like the negative one as there are a lot of things I like but I was really hoping for a different fuel injector location IE: Direct Injection.
I am fine with the single ring piston. I have my suspicions on why they went this way.
I'd sure like to know rod length and center to center distance between the rods.
I am a little concerned about the clutch. Do we know if they did anything to the snout? They thickened up the crank; very good was needed. But what did they do with the clutch snout going from a 32mm to a 34mm? If they just recut the current P-85, then I foresee a repeat of the cracked clutches.
I really like the speed improvement of the ECU. I really hope they cleaned up the electrical and wiring.
I am fine with the single ring piston. I have my suspicions on why they went this way.
I'd sure like to know rod length and center to center distance between the rods.
I am a little concerned about the clutch. Do we know if they did anything to the snout? They thickened up the crank; very good was needed. But what did they do with the clutch snout going from a 32mm to a 34mm? If they just recut the current P-85, then I foresee a repeat of the cracked clutches.
I really like the speed improvement of the ECU. I really hope they cleaned up the electrical and wiring.
9% more HP than the 800 puts it safely in the upper 160s.
Thanks King!
And Erik !!
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If it is 'class leading power' ... what is the benchmark made on the dynos for STOCK 850-Rotax... the only other in the class??
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4 year warranty, Definitely a selling feature. 
A
ak
Well-known member
Dynotech dyno rd a 2018 ski doo 850 with 1,000 miles at 166 hp
They added 2 degrees of timing and got 168 hp. So I would think Polaris should be right in that area.
The expansion chamber on that pipe is FAT.
Chris Brown, Phatty and I were all like...whaaaaat? HAHA
Chris Brown, Phatty and I were all like...whaaaaat? HAHA
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That “new lightweight crank” looks heavy
That can looks like the size of my duramax muffler lol that has to go
