Couple ways of looking at that. Moving air does take horsepower but also cools the clutch. Keeping the clutches cooler would outway the horsepower lose
stop sale stop ride.
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My understanding is it is consumed in the combustion process. Just adds a slight increase in oil usage. A ball bearing turbo doesn't need much oil. An Aerocharger turbo uses a wick fed oiling system and the small reservoir lasts a very long time.
No different than the crank bearings in a two stroke. A thin film of oil is all that is needed. We have hundreds of pumps at work with ball bearings that run at 3600 rpm 24/7/365 on an oil mist system. No wet sump, just an atomized oil mist that is supplied to the housing.
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309 Posts
There is no oil return on the RMK boost sleds and the trail versions will likely be the same. Polaris claims only 2% more oil usage on a boosted 850 vs a NA Patriot even with the oil sent to the turbo being solely used to lube the ball bearing.
There are two places the small amount of oil (2% of total oil usage) pumped to the Center Hub Rotating Assembly (CHRA) of the turbocharger, can go.
1. Past the Compressor Impeller and into the intake air going to the engine. Very little oil does this because there is some pressure from the air being pressurized.
2. Past the Exhaust Turbine and into the hot exhaust exiting to the muffler
There is NO return line to the oil reservoir/sump, as used in most four stroke turbochargers, lubricated by engine oil.
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11,294 Posts
the p-85b robs 5 h.p. plus at 8000 rpm. even more above that. the pb-80 about 1. and it stays cooler then the p-85. test by CV-TECH. also the p-85 is about worn out between 3500-4000. the pb-80 28,000 miles. again tested on there clutch test unit that is computer controlled varying load, rpm, etc. with a belt and driven clutch. ran straight no relief until vibration was bad enough to stop it or belt blew. in the case of the belt they just changed it.. we have a lot of these in the field. every customer very satisfied with them. tuning? takes 5 minutes to add subtract weights. no spring involved. one nut and half the clutch comes apart. no puller needed to change weight. got to love the mouth runners on here who have zero experience with these? just like a patriot boost. we have one. it ran it good when it stayed running. 4 issue's in 400 miles. and i bet the clutch doesn't last beyond 3000. nice $23,000 pos. better hope the bugs are worked out on the trail boost coming? again a lot think they know or just link shit from other's. we don't do that. we will always post the good the bad and the ugly. like it or not.
I may be wrong but I don’t remember you having a boost at all last season. Now you have one and somehow put 400 miles on since the snow was extinct in the East. Were you running it on a lake? What were the 4 issues you encountered during your 400 miles of riding in the off-season? Again I may be wrong but I don’t recall that you had a boost.
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5,095 Posts
Shit, someone better scoop this PB80 clutch up quick!! 😂
Aftermarket Clutch for Polaris Snowmobile - atvs, utvs, snowmobiles...
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Fresh off the CV Tech dyno after 29,000 miles.Shit, someone better scoop this PB80 clutch up quick!! 😂
Aftermarket Clutch for Polaris Snowmobile - atvs, utvs, snowmobiles...
Aftermarket Clutch for Polaris Snowmobile 2010 to 2015 years $45.00 Cash Only, No Trades, No Holds, Will NOT Ship Pickup Only At My Home In Hibbing MN. Will NOT Reply to Texts or Emails, CALLduluth.craigslist.org
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19,682 Posts
Here's video that explains the PB80 clutch.
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Notice that the power to the outer movable sheave is all transferred by the steel cover via a thin hex hole. Looks pretty fragile to me.
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68 Posts
Looks are deceiving, I have one that has been on my last 4 skidoo 4 strokes. Over 40,000 miles with only yearly cleaning. They do run warmer than the E drive skidoo clutch, but never had any belt issues. But never had any belt issues on any of my Polaris P85, and never wore one out in 3000 miles. Maybe I am just to easy on my sleds?
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I too never have any of the reported issues with the P85.
As for the PB80, how do you change belt side clearance? How about change the rate of shift based on pipe temp gradually increasing?
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68 Posts
Clearance is preset, and never had a problem. Pipe temp increase was not an issue on the 4 strokes. I have only had the PB80 on 4 strokes and dont know of many on 2 strokes, so I can only talk about how well they hold up, and belt heat on them. Well built and easy to adjust, but dont know if they are a great product for 2 strokes.
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11,294 Posts
ask lenn johnson about the p-85 clutch wear problems. he rides extremely hard. i rebuild his clutches. if you keep them clean there will last longer. if nothing done to them then they are worn out in the mileage i said. again i see 150-160 sleds per year. big difference from a single owner or week-end warrior. there are a lot of moving parts in a p-85 clutch. moveable sheave bushing and weight bushings the biggest problem. about every clutch i take off have spider damage from weights hitting them and wearing a groove in them. some with under 2000 miles.
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it's high strength steel. again talking about something you have no experience with? the p-85 not even close in reliably.
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I can easily see where the weak areas and potential lack of durability and functionality are in any mechanical device.
Unlike you, I'm not trying to sell these products.
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