Lets talk hot fixed sheave on inside primary

[race24x]

So been riding lots the last few weeks. I never really notice the hot fixed primary in cold temps, but when the ambient temps get up there into the high 20's and low 30's as it gets warmer now, I'm seeing black streaking on the inside of the primary and secondary. I also notice the RPM goes in the toilet as the belt gets hot which is to be expected.

I thought maybe I needed to try floating the secondary, so I set it up to float yesterday. Conclusion, floating didn't help a thing. Inside sheave still hot! Outside movable is actually extremely cool along with the secondary being cool. It's not an alignment thing and its not a clutching thing. We had three Sidewinders yesterday all with different clutching components, belts and different tunes, and everyone of them had the exact same thing going on. About 30F ambient and all 3 had hot inner primary sheaves and cool movable secondaries. All 3 sleds were getting flogged hard and we were having fun with them.

I'm going to be installing some type of fan and ducting going to the backside of the primary and the inside of the belt to try and cool the inner sheave and belt down. Just the fact the clutch is bolted and attached to a engine with 170* water temp and even hotter that 200* oil temps there is no way to get away from the fact the clutch is attached to a heater. It needs cold air blown on the backside of the primary and thats all there is to it. Can't run in 0*F air all the time, so going to need to do something to get heat down on it, and yes, I have vents galore up front along with the Fleecer scoop mod and venting out the back of the panel.

Wait what Fleecer scoop mod. I havent read anything about this mod. My stationary sheeve is hot as well. I thought about using some computer fans ( I am a computer nerd) like they use on a Dell and some ducting to make sure the air is dry and no snow dust

 

[ROCKERDAN]

Milder temps now(35f) and sheaves all run hotter now.....

I have a scoop with air blasting right on clutches, still hot. It is way diff with temps over 30f Im noticing. Belt still doing well though.

Dan

 

[PowderFalcon]

I notice the same on my sled guys.

Both secondary sheaves and outer primary are about the same temp. The first primary sheave is super hot.

We need to load up the plastics with bullseyes to get some air in there??
I already have a moflow vent and drilled out my belt guard to get air in there.

 

[KnappAttack]

Wait what Fleecer scoop mod. I havent read anything about this mod. My stationary sheeve is hot as well. I thought about using some computer fans ( I am a computer nerd) like they use on a Dell and some ducting to make sure the air is dry and no snow dust

This scoop made from the old SS pipe that was updated. It didn't do squat to cool anything down in my case. The WAI is gobbling all the air coming thru the front vent and then some anyway. I'll be taking the scoop off this week.

 

[KnappAttack]

I notice the same on my sled guys.

Both secondary sheaves and outer primary are about the same temp. The first primary sheave is super hot.

We need to load up the plastics with bullseyes to get some air in there??
I already have a moflow vent and drilled out my belt guard to get air in there.

We need a fan blowing on the inner primary sheave and inside on the belt I believe. I too am loaded up with added frogskins and the Mo-Flow along with a huge gaping hole with frogskins behind the intercooler. My movable on primary is actually cold, but the inner is very hot on a 30F day in mealy snow. Secondary is also cool.

 

[theewarrior]

The engine compartment of boats have a really nice fan 2 1/2 inch round for around $40

 

[KnappAttack]

The engine compartment of boats have a really nice fan 2 1/2 inch round for around $40

Just ordered up a 3" Yellow Tail boat blower you are supposed to be able to run constantly and a 90* silicone elbow. My hope is to mount it in the belly pan under the engine and blow air onto the back of the primary and inside of the belt. I think this will be better than mounting it in the side panel and blowing across the outside of the clutches like I had planed on doing earlier. The outside of the clutches are already cold, I just need to cool that stationary on the primary and inside of the belt better IMO.

 

[ClutchMaster]

I also think the towers on the movable are like fan blades and heat sinks, pulling heat from the movable sheave, cooling it off.
Too suggest that engine heat coming from the engine shaft it just not totally true. The sheave would be much hotter close to the shaft and much cooler on the outside diameter of the sheave.
Agreed some type of fan or vent would really help. Mine is hot also really need to come up with something.

 

[fatchance]

I tried mounting a 4 inch fan just in front of the foot well to pull that cold air in and it didn't seem do do squat to cool things down. It was a good quality 200 CFM fan too. Disclaimer....it was cold out at the time and not during any kind of warm weather.

 

[theewarrior]

Just ordered up a 3" Yellow Tail boat blower you are supposed to be able to run constantly and a 90* silicone elbow. My hope is to mount it in the belly pan under the engine and blow air onto the back of the primary and inside of the belt. I think this will be better than mounting it in the side panel and blowing across the outside of the clutches like I had planed on doing earlier. The outside of the clutches are already cold, I just need to cool that stationary on the primary and inside of the belt better IMO.

I will be putting a through the hood intake that will free up a lot of space to work with for a fan

 

[ClutchMaster]

I’m thinking a piece of aluminum pipe that comes from the front end down in front of the motor with a bend blowing onto the back of the primary clutch.

 

[Fast]

Mike I noticed my inside fixed sheave of primary very hot many weeks ago. While movable is literally COLD much of the day. I floated and moved offset, and it remained hot as yours did.

I attribute this to my Stub shaft pulling heat off crank end(heat sink). But I know my stub is pushed inward some, and so would not think they all are this warm.

Dan

Why didn't you set the stub shaft back to spec when you had it apart

 

[ROCKERDAN]

Just back from 3 day trip. Got 1863 miles. Belt still all good. Lots and lots of hi speed running on some incredible wide open trails.

Back to B/O@ 6/2 and all those hot clutch temps are history. COLDEST clutches I have felt EVER on mine, since I made a chute(air aimed onto clutches) and back to 6/2 combo.....Even the inside fixed sheave barely had any heat at all.

#RAPTOUR

Dan

 

[Fleecer]

Just back from 3 day trip. Got 1863 miles. Belt still all good. Lots and lots of hi speed running on some incredible wide open trails.

Back to B/O@ 6/2 and all those hot clutch temps are history. COLDEST clutches I have felt EVER on mine, since I made a chute(air aimed onto clutches) and back to 6/2 combo.....Even the inside fixed sheave barely had any heat at all.

#RAPTOUR

Dan

View attachment 146799

Any pics of the chute?

 

[Fleecer]

Just back from 3 day trip. Got 1863 miles. Belt still all good. Lots and lots of hi speed running on some incredible wide open trails.

Back to B/O@ 6/2 and all those hot clutch temps are history. COLDEST clutches I have felt EVER on mine, since I made a chute(air aimed onto clutches) and back to 6/2 combo.....Even the inside fixed sheave barely had any heat at all.

#RAPTOUR

Dan

View attachment 146799