dyno results - 800 engine quality

[live to ride]

after reading a few threads on the 2011 800 dyno results it is a little disapointing to see 140 ish hp, but this can be overcome if more hp is actually needed by clutching and slight mods. The problem is i get this gut feeling of the horror of this motor blowing up like the past three years.
Calling on the experts here, does anyone have any info as to the quality of this new setup, do you guys know or have you heard anything ?
snow check ends tomorrow, what to do?

 

[AKSNOWRIDER]

after reading a few threads on the 2011 800 dyno results it is a little disapointing to see 140 ish hp, but this can be overcome if more hp is actually needed by clutching and slight mods. The problem is i get this gut feeling of the horror of this motor blowing up like the past three years.
Calling on the experts here, does anyone have any info as to the quality of this new setup, do you guys know or have you heard anything ?
snow check ends tomorrow, what to do?

buy it..ride it stock and see how it does...otherwise if you dont and it rips..your gonna be kicking yourself....if it doesnt rip..add a pipe, pc-5 and porting..right?

 

[live to ride]

thanks for the reply but it is not the power that i am worried about, it is weather or not this engine is going to hold it togeather or is it a time bomb like my 09 ?

 

[theultrarider]

buy it..ride it stock and see how it does...otherwise if you dont and it rips..your gonna be kicking yourself....if it doesnt rip..add a pipe, pc-5 and porting..right?

From everything I have read and heard from those that have actually ridden them, it wont need anything but fuel. I for one feel safe with my new 2011. Now if would just hurry up and get here

 

[theultrarider]

thanks for the reply but it is not the power that i am worried about, it is weather or not this engine is going to hold it togeather or is it a time bomb like my 09 ?

This motor should be safe. It was the 4 injectors and the transition point that gave the 08-10 sleds fits. Short of changing them to a 2 injector setup, it has proven tough to get them to stay together. The 2 injector setup should take care of the issue that some have had with the 8's the past three years.

 

[live to ride]

From everything I have read and heard from those that have actually ridden them, it wont need anything but fuel. I for one feel safe with my new 2011. Now if would just hurry up and get here

so would it be fair to say or reason that the 4 to 2 injector, new ecu and voltage reg. that this would solve the problem of blown engines that so many of us have experienced with our 09? I know time will tell the true story but once again what do you teck heads think?

 

[AKSNOWRIDER]

so would it be fair to say or reason that the 4 to 2 injector, new ecu and voltage reg. that this would solve the problem of blown engines that so many of us have experienced with our 09? I know time will tell the true story but once again what do you teck heads think?

I will say yes....those are the two major problems with the dragons...yes in 08 they did come with too much bore clearence and a single ring that caused issues..but most of that was a result of the lean midrange(causing excessive piston expansion)other then that..these motors have been pretty darn reliable not counting the VR, ecm, stator and fuel mapping/EPA problems..which are all new and of a much better design to go along with the 2 injector fuel system....I would buy me one if I could..but the money isnt there for it this season...

 

[live to ride]

thank you, i really really hope this one can stay togeather.
looks like i'am back in the poor house tomorrow and a rmk assult on the snow next year, orange i think...

any more thoughts out there?

 

[gman086]

thank you, i really really hope this one can stay togeather.
looks like i'am back in the poor house tomorrow and a rmk assult on the snow next year, orange i think...

any more thoughts out there?

Yeah, the Dynotech test was on a RUSH motor with 1700 miles on it. I'm no Poo expert but I am a Doo expert and they always have higher compression heads and a more aggro pipe for the Summits vs. the MXZ's so I'm putting ZERO stock in those numbers for my new Pro RMK!

Have FUN!

G MAN

 

[live to ride]

hey gman, i follow what your saying, if the power is as good as the 09 assault i rode this year and is as flickable a sled i will be happy reliability is my only concern. This assault is going to replace my 09 dragon sp 800 and my 07 800 xrs 121. I have a 10 summitx 800 146 that imo is more of a nice trail ( woods roads) sled then a drop, sidehill, jump animal the assault is, ... i guess what i am saying is i hope this assault is not as well planted as the doo.

 

[rmk727]

Did you pay attention to the 1700 miles part? That's pretty reliable isn't it? They say they have put over 110,000 miles on the fleet with no motor problems , now that's with no vents or anything other than stock. As far as power ( horse Power) goes Polaris has made a living out of beating more hp sleds way back to the70's when the little 340's kicked the other 440's all day. But then if Polaris made a beer ( in Roseau) that's what beer I'd be drinking.

 

[Ron]

Just some add'l thoughts........Polaris spent millions on a recall, bought an engine co & held back the Pro a year. Good signs of a committment on their part but still no guarantees!

 

[IceCap]

There's no guarantee that I will be alive next year either.

It seems like polaris has changed all the problem parts of the past with new ones..... so only time will tell.

But why so shy on power? Maybe a SLP single will bring it up over 150 HP.

 

[AndrettiDog]

All I can say is that it is way too early to buy into HP numbers. Yeah, Jim is good and did a solid dyno run on the 800 Rush, but does anyone remember how bad the 800 Dragon was? I got great HP out of my Dragon with the PCV and eventually a head mod with stock pipe mod. With the injector changes, I'm confident that we will see good HP out of the box (with clutching).

 

[Luvinit]

Don,t forget the extra hp,s in the midrange,thats huge imo. My 900 gave me fits but that tractor midrange made up for it.

 

[F-Bomb]

Can really only relate this to our situation here at 5000 to 10000 feet in altitude. The sled I have now ridden several times (Polaris factory line production 2011 Pro RMK pre-production demonstration EPA rated experimental vehicle) is stronger feeling and physically faster then last years 2010 production stock sled in same CC and track configuration. (lighter vehicle slightly improved mechanics) In our world these sleds competed exceptionally with every other similar offering irregardless of brand.



Reliability is unknown in a general mass produced and applicated environment. Expectations from design and past experience have been modeled and addressed with high confidence. As a consumer we can lesson our risk by taking advantage of the exceptional warranty offer from Polaris and by buying our stuff from the best dealer option available to us. IE the lowest purchase price may not directly result in lowest total experience price when you finally get down the road a mile or two!

 

[winter brew]

Going back to the development of the 4 injector design.....wasn't that done to "supposedly" eliminate the problems they had with the original 2 -injector system?? I seem to recall Polaris saying something about piston heat issues with only 2 injectors or issues with adequate fuel delivery??? There was a definate reason they didn't go with 2 injectors back in '08. Anyone remember ? And what did they change to address those issues now, besides backing down the power 15+HP.
I'm sure the sled FEELS very snappy and powerful compared to a stock '10....it's 70+lbs lighter (or whatever)....that is a HUGE difference!
Hopefully they get their "stuff" together on this 800, the faithful having been putting up with alot since '05 with the 900, 800 class.

 

[thefullmonte]

Going back to the development of the 4 injector design.....wasn't that done to "supposedly" eliminate the problems they had with the original 2 -injector system?? I seem to recall Polaris saying something about piston heat issues with only 2 injectors or issues with adequate fuel delivery??? There was a definate reason they didn't go with 2 injectors back in '08. Anyone remember ? And what did they change to address those issues now, besides backing down the power 15+HP.
I'm sure the sled FEELS very snappy and powerful compared to a stock '10....it's 70+lbs lighter (or whatever)....that is a HUGE difference!
Hopefully they get their "stuff" together on this 800, the faithful having been putting up with alot since '05 with the 900, 800 class.

I believe you are correct. A quote from Mark at CMX:
"Polaris was very smart in their design of the CFI system. It seems that they did their homework and applied what a lot of people know: there are inherent advantages to where the fuel is delivered on a 2 stroke engine in relation to RPM. At low RPM it likes its fuel delivered through the crankcase and in the mid-range it likes it in the boost port area of the cylinder and then again at full throttle it needs it back in the crankcase. With the advent of their new CFI, Polaris was able to enhance the performance by making proper fuel delivery."


The 4 injector system was just bleeding potential. The reliability and performance was there just waiting to be tapped, but required working around the EPA and voiding your warranty. The Power Commander was a blessing for many.
Remember, Polaris cannot afford to take chances at this point. They are having a long run of quality and customer issues. So, a little less HP may be a safety blanket. I believe the new motor did receive some porting changes to go along with the 2 injector system. Please don't hold me to that??? It would make sense though to adjust the porting to match what the fuel injection is going to be capable of. So, I suspect smaller port height, but the same configuration.

A few other things to consider is that there is a big performance difference between 50deg and 30deg outside temp. Weight loss and the new chassis design may have improved power transfer significantly also. Basically what I'm trying to say is that you may get the same performance from less HP if it is applied correctly. 160hp doesn't mean anything more than 143hp does if you aren't getting the power to the track.
Just some food for thought.

 

[dexter]

i was really considering going back to polaris until i read the hp #'s. 2o hp less than doo and cat. this is really disappointing. I agree with clutching and getting the power to snow on all machines but this is just to much to give up.

 

[retiredpop]

I think people are too hung up on the horsepower figures. There is so much more to it than power at the crankshaft. I say if you can't get this sled to go where you want then you have some serious riding deficiencies.