Just curious if anyone is currently running one of there kits on there Polaris? I talked to Carter at Tog about these at Haydays and it sounded like it was a worthwhile upgrade for any late model 800 or 700. Just looking for some insite on the product! Sounds like they are working on a kit for both Skidoo and Arctic cat. http://www.mostwantedperformance.com/
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Most Wanted Performance's Gizmo? Anybody got one on there 800 or 700 Poo???
- Thread starter willey
- Start date
Nobody??? Thought with a few of the guys on here running the new Pros they would have something to say about this product. I know the riding around are neck of the woods has not allowed many the opportunity to break-in there new sleds. Heck I still need to break-in my SHR 800R rebuild on my Summit.
Just curious if anyone is currently running one of there kits on there Polaris? I talked to Carter at Tog about these at Haydays and it sounded like it was a worthwhile upgrade for any late model 800 or 700. Just looking for some insite on the product! Sounds like they are working on a kit for both Skidoo and Arctic cat. http://www.mostwantedperformance.com/
There's a thread on that product on SnoWest.
You may want to read that from people that have actually used that product and still had issues.
Cool. I am a member over there and hadn't found any topics on it. I will check it out!
It's definitely in the IQ section,
The other different product that has seen some success is the PMS "fix" kit which includes new longer skirt pistons, with the proper .004-.005" piston-to-wall clearance. No coolant mods.
as they're whole basis is that the original piston -to-wall clearance is excessive to start with.
Here' the link to that Thread:
http://www.snowestonline.com/forum/showthread.php?t=245510
Here's a summary of the kit that PMS POLARIS sells:
Here is the original post from PMS Polaris / Originally Posted by MTNTK
I appreciate the comments on our products, but there are a few things your not getting quite right. Polaris built this motor to be very compact and lighter than previously designed engines. This being said there were compromises made that they thought were "acceptable".
One of those were to shorten the piston as much as possible. This kit is not a rod ratio change nor does it fix a rod ratio. it does not use pistons with a higher rod location to allow a longer rod to change thrust loading. Nor has any of our research found that the polaris engine had improper thrust loading on the piston.
If the thrust loading problems were true, then you and i would have seen scoring and piston damage on the thrust side of the pistion/cyl. I have never had a problem with the thrust/intake side of the piston. It always looks good, but the exhaust side looks really bad. But it is interesting to look at the design of the polaris engine, because it looks like an engine that they were trying to eliminate rod thrust loading because the stock piston has a rod pin location that is high on the piston almost like they were trying to get the longest rod possible without getting any deck height increase.
What our kit does do is raise the cylinder up and allow us to put a taller piston in the cylinder. What we found is that the polaris engine has excessive piston to cylinder clearance. this allows the piston to rock in the bore effectively using the top and bottom edges of the piston instead of the entire bearing surface of the skirt.
I have a very reliable source that stated polaris had a severe piston heating problem in the prototyping of the engine and so they elected to go with increased clearance to prevent piston seizure. This heat problem was fixed with the ecu reflash. The clearance combined with the piston design causes the piston to scrape the cylinder wall on the compression stroke, especially the exhaust side.
This is why the piston looked like it ran out of oil on the exhaust side but not the intake. This is why the engine would never totally fail, just slowly start to run bad, not going into reverse and then hard to start and then put, put, put and barely back to the trailer. This is also why there was an interesting phenomenon that when using a turbo on this engine it would last longer than stock. Everyone thought it was a fuel issue, but it was not. It was a piston size problem. The turbo added heat and the piston grew taking up the clearance.
The taller piston benefit can be easily described by the analogy if you have a smart car(which is a very short car!) on a single lane highway it would be much easier to turn around without going off the road than it would be to turn a tractor trailer semi (a very long vehicle)around on the same road. The piston does the same thing. It can't move away from the cylinder wall nearly as easy if it is longer and has tighter clearance than the stock piston. This makes horsepower in more than one way.
The first way is because the piston is not leaned over it holds cylinder pressure longer and makes the power stroke longer. The second way is the piston is 40 grams lighter so there are not as much parasitic losses internally. Third and less known is the piston slap is reduced and excessive piston slap can set off the detonation sensor and back off timing. fourth is the previously stated crankcase volume increase, which has been proven in numerous sae studies with tuned pipes is almost always beneficial for engines designed for peak power.
On our dyno it made 4.9 hp more and that was on a totally stock 2010 engine, airbox, and fuel. I hope this sheds some light on the product and I hope you can have some faith in it that we don't just come up with some gimic or "widget" and sell you on it. We test, we prove, we cannot sell you something we do not believe in. I welcome any more questions. Shawn, Mountain Tek Performance
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Interesting read. It makes sense. Are the 2012 engines the same?
They seemed to have the issues resolved with the 2011/2012 800.
New vendor supplying injectors, longer skirted cylinders that "hang down" further down into the case and tighter more consistent piston-to wall clearance.
The 2008-2010 800's are the ones that seem to need this FIX-IT KIT to survive.
They don't make the kit for the 700's