[Devonellis]

Hey I'm looking at adding an inline 12v fan to blow colder air through the clutch case. Does anyone know which is the inlet and exhaust? Behind the seat or back of engine?

[NMKawierider]

Hey I'm looking at adding an inline 12v fan to blow colder air through the clutch case. Does anyone know which is the inlet and exhaust? Behind the seat or back of engine?

The inlet is behind the seat and the discharge/exhaust is to the back of the engine and blows are across the exhaust pipe. I have one on mine but I re-routed the intake out into the bed and pit some stacks/snorkels on them. There's a video in the How Tos or my YT channel.

[Dutchtrekker]

I re-routed my inlet also. My U800 also has a snorkel between the seats. The wind blows right in it.
I also re-routed my outlet. The old one blows the air against the motor; the opening is one inch from the motor. I made a bent in the outlet so the air goes under the motor = downwards.
It works ferry good.

[Ponytail]

With the inlet behind the seat,I’m guessing it doesn’t get much air. Is there something pulling air in,or just air flow from the inlet?

[Ponytail]

Correct behind the seat. There’s not much air moving there,I wanted to know is there something pulling the air though it. I guess the spinning of the clutches pulls air in???

[Dutchtrekker]

Normaly the clutch moves the air, but not very good. That is why I build a snorkel on the intake and put the entrance of it in the ride wind.
 

[Ponytail]

Perfect. That’s what I wanted to know. Thank you.

[glenlivet]

It's a bit of a false notion that the intake gets less air because it is behind the seat. Unless the intake is partly occluded it's going to get air at atmospheric pressure no matter where it is.
The CVT is a fan forced air system and the fan is the vanes on the primary clutch inner sheave and it moves air well enough to also serve as a blower to help evacuate engine compartment heat by blowing right on the exhaust pipe of the front cylinder. The rear one has its own dedicated fan.

Some sources estimate a CVT belt drive system to lose 17% of output to frictional losses (no drive is 100% efficient) and this energy, converted to heat, must be got rid of, hence the CVT fan. It doesn't move much at idle but when at operating RPM, it's working alright.

Doesn't mean it can't be helped out with an accessory fan though, like NMK has done, especially if the intake plumbing has added length and direction changes like when a snorkel is added. A just-warm belt is a happy belt.

[NMKawierider]

It's a bit of a false notion that the intake gets less air because it is behind the seat. Unless the intake is partly occluded it's going to get air at atmospheric pressure no matter where it is.
The CVT is a fan forced air system and the fan is the vanes on the primary clutch inner sheave and it moves air well enough to also serve as a blower to help evacuate engine compartment heat by blowing right on the exhaust pipe of the front cylinder. The rear one has its own dedicated fan.

Some sources estimate a CVT belt drive system to lose 17% of output to frictional losses (no drive is 100% efficient) and this energy, converted to heat, must be got rid of, hence the CVT fan. It doesn't move much at idle but when at operating RPM, it's working alright.

Doesn't mean it can't be helped out with an accessory fan though, like NMK has done, especially if the intake plumbing has added length and direction changes like when a snorkel is added. A just-warm belt is a happy belt.

And when the operator has installed an air filter that gets packed and slows the airflow. A helper fan is appreciated..like on the trip I just came back on.

[Mr. Moto]

I put a blower on the output side and it works great. Got a 3" bilge blower and used 3" flexible aluminum dryer hose. Modified the discharge opening, cut the top off it and reshaped it with a heat gun to 3" round to connect the dryer hose.