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850 Engine thread (840cc)

10003514

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Everybody that I know who rode the new 850 raved about the motor. That is around 20 guys at this point. The motor has great linear power and whipped all of the modified 800s that it was paired against. As much as they all went on about the motor, they loved the new front end even more. I don’t know what happened with the Norway sleds nor do I necessarily believe it. We will see next year but I believe that the 850 was is going to be great. For the record, I have had multiple Polaris RMKs over the years with various modifications that including one turbo and I never had an engine failure. Not one. My one Cat burned down about every ride.

Sounds like the Norway demos had some bad mapping and clutching for their elevation/conditions. All the demos up in Canada have been getting great reviews, super excited for next season will be my first Polaris.
 
J

Jaynelson

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Sounds like the Norway demos had some bad mapping and clutching for their elevation/conditions. All the demos up in Canada have been getting great reviews, super excited for next season will be my first Polaris.

Ya the 3 in our ride ran totally fine. They were still "working on the maps" and apparently all 3 sleds had different maps, but I couldn't find anything quirky with the running. Sleds had 900kms on them...so they had been ridden a bit for sure
 
M
Dec 29, 2010
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dt0115017.jpg



There's also this: http://www.dynotechresearch.com/file_upload/page_files/DTRPolAxysPipeShootout.pdf

Which is after 2300 miles. Stock power was 154.1

this chart puts an 800 ho at 158-160 hp at 8250 rpm (correct me if im wrong) so that puts an 850 at 172-174 hp with a 9% increase in hp over the 800 ho right? cause someone earlier said "based off the the graph it would put the 850 at 168 hp safe to say"

but my question is... is the 850 a 9% increase in hp?... or from what i thought i saw somewhere (i could be mistaken) ... is it a 9% increase in power to weight ratio since they gained 7#? so if that is true( and i emphasize IS THAT TRUE because i am not certain but i thought read it somewhere and this is why im asking) what is the hp?
im am no math major!!! HA!!
 
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J

Jaynelson

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I've read 9% more power...not power to weight.

Honestly every thread, Facebook post, Instagram post, etc has the same HP question. No one can/is going to nail down a number....not gonna happen. Heck, there is still disagreement on the power of all current 800's and Doo's 850 and all that stuff has been around for the few years.

It's a nice increase...no danger of NOT noticing it IMO (have ridden 1). If you are expecting it to feel like a turbo, you will be disappointed. If you are expecting a nice linear increase at all RPM's over the current motor, you will be in love. It goes much better than the current 800 with a full SLP exhaust...that much I can say.
 

Scott

Scott Stiegler
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Fact:

9% HORSEPOWER increase over the 800ho.

I heard it directly from Marty Sampson (director of RMK division) and JimB (his engineer).
 

cascadesnowjunky

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I wonder what the 800 ho was supposed to be? If it is 9% of 160 that is a bunch. If it was 160 then the new 850 will be a monster at nearly the same weight, that would put it in the 174 to 175 hp range with a lot wider power range. I have not ridden the 850 but have a friend that just checked a 155 2.6 with piggy back shocks, cannot wait to ride it. This season is not even over yet and I am looking forward to next season already.
 

damx

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At dynotech recerch the axys 800 is in the 154-156hp. Only 1 made the 160hp. 155+9%=168.95. I just hope it has 106-110 foot pounds from 7600rpm and up.
 
J

JJ_0909

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So at 8000 feet we are looking at 125 horse vs ~114 horse on the old motor. Something like that.

After factoring in drivetrain loss, its going to be something like 5-6 horse at the track.

Benefit? For sure. Massive? No.
 

Scott

Scott Stiegler
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I don't think people feel an extra 5 hp on the "seat of the pants" dyno.

You CAN feel the extra power of this engine. Believe me.

My stock 800 at 5500 feet feels weaker than the 850 at 8500 feet.
 
J

JJ_0909

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I don't think people feel an extra 5 hp on the "seat of the pants" dyno.

You CAN feel the extra power of this engine. Believe me.

My stock 800 at 5500 feet feels weaker than the 850 at 8500 feet.

9% is still 9%. I was just trying to show how that number is a bit skewed as you go up in elevation.

I don't doubt' people will notice...and if you really read between the lines I was suggesting we'd all be a lot better off if we could limit the damn drivetrain loss in a sled!
 
R

Ratchit

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here
this chart puts an 800 ho at 158-160 hp at 8250 rpm (correct me if im wrong) so that puts an 850 at 172-174 hp with a 9% increase in hp over the 800 ho right? cause someone earlier said "based off the the graph it would put the 850 at 168 hp safe to say"

but my question is... is the 850 a 9% increase in hp?... or from what i thought i saw somewhere (i could be mistaken) ... is it a 9% increase in power to weight ratio since they gained 7#? so if that is true( and i emphasize IS THAT TRUE because i am not certain but i thought read it somewhere and this is why im asking) what is the hp?
im am no math major!!! HA!!

I’ve dyno’d at least 6 different 800 axys sleds at dtr. The average one would be around 152 hp at dtr . The one in the graph was 154 hp. Not that it matters ?

I hope the 850 is as much as the 840 we dyno’d at dtr. (Same bore and stroke as new patriot 850) We’ll see soon ?

60C6C50D-C1D3-4F0E-9157-D4AE9AEA3471.jpeg
 
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S
Nov 26, 2007
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good luck getting a production engine to run as hard as spring "demo" sleds..invariably ignition timing and fuel delivery are detuned in the interest of engine longevity and warranty claims... just my observation of different brands promotion "demos"...:face-icon-small-dis
 
J

Jaynelson

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I don't think people feel an extra 5 hp on the "seat of the pants" dyno.

You CAN feel the extra power of this engine. Believe me.

My stock 800 at 5500 feet feels weaker than the 850 at 8500 feet.
That's what I was getting at. Put a pipe on the current 800 (probably 5hp or even a bit more) and you are kinda humming/hawing on if it feels much stronger....you're pretty sure it does? But not sure how much. The 850 isn't like that.
 

Killer Time Racing

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So here at Sea level BMP will for sure push their 200HP kits by mid summer ...

SSI will be quick to add 10 more

I keep seeing everyone planning their purchase .. Isn't it to late to order ??

Polaris promised NO Ghost Snowcheck ??!! Like the Needle Shocks prob!:deadhorse:

Funny comment above " Accessory Turbo kits " Riiggghhtt!:flypig:
 
N
Apr 9, 2010
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So here at Sea level BMP will for sure push their 200HP kits by mid summer ...

SSI will be quick to add 10 more

I keep seeing everyone planning their purchase .. Isn't it to late to order ??

Polaris promised NO Ghost Snowcheck ����!! Like the Needle Shocks prob!:deadhorse:

Funny comment above " Accessory Turbo kits " Riiggghhtt!:flypig:

FWIW, I talked with a dealer also claimed that they weren't allow to order any snowcheck sleds to sell on the floor this fall, when they had been allowed to do so in the past. Still not sure how this works in practice if a "buyer backs out"
 

Scott

Scott Stiegler
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FWIW, I talked with a dealer also claimed that they weren't allow to order any snowcheck sleds to sell on the floor this fall, when they had been allowed to do so in the past. Still not sure how this works in practice if a "buyer backs out"


Yes, that's what we have been saying.

If you don't snowcheck, you won't get a new 850.

BTW, that ends at closing time TONIGHT!!!!
 
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FatDogX

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Yes, that's what we have been saying.

If you don't snowcheck, you won't get a new one.

BTW, that ends at closing time TONIGHT!!!!

Exactly, I was told by our local dealer that if they do a ghost snowcheck, they run the risk of a pretty hefty fine from Polaris.
 
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