Short tunnel snow flap

[greasemonkey3406]

For the guys who run either a 163 in a 155 tunnel or have cut their tunnel, what are you doing with the snow flap? Im running a 162 in a 155 tunnel and the flap keeps getting caught in the track. Anyone trim the flap and have good luck?

 

[Sheetmetalfab]

For the guys who run either a 163 in a 155 tunnel or have cut their tunnel, what are you doing with the snow flap? Im running a 162 in a 155 tunnel and the flap keeps getting caught in the track. Anyone trim the flap and have good luck?

Remove the flap.

Ez money

 

[revrider07]

Any heating issues when removing flap

 

[kidwoo]

Have you tried a tunnel extension?

 

[cateye5312]

If you shorten the tunnel you need to shorten the snow flap. The snow flap and the tunnel length are designed to work in conjunction with one another to cool the sled. Therefore if you cut your tunnel and cut your flap you will cause the sled to run warmer. And if you don't cut the flap and you allow it to fold up into the tunnel you REALLY defeat the purpose because now NO snow is getting to the cooling system inside the tunnel. This should not be an issue in deep snow ( which is the reason you cut the tunnel in the first place ) but may cause an issue on the trail. Run a good set of ice scratchers, keep an eye on your temps and avoid riding on the trail for extended periods of time and you'll be fine. Everything is trade off. If you want a shorty tunnel you give up some cooling. Which would you rather have? A sled that runs cooler down the trail or a sled that has a better chance of not getting stuck when you get to the deep stuff and might be a bit more playful as well?

 

[cateye5312]

ps - I haven't chopped my tunnel yet but it's on the list - hoping someone will do a post soon about the new Mtntech(?) tunnel shortening kit. I did cut my snow flap which made a small difference in getting stuck as easily in the deep stuff since it reduced drag - really didn't notice much of a difference in trail temps but then I'm lazy and I run cable ice scratchers and leave them down 100% of the time.

 

[Sheetmetalfab]

ps - I haven't chopped my tunnel yet but it's on the list - hoping someone will do a post soon about the new Mtntech(?) tunnel shortening kit. I did cut my snow flap which made a small difference in getting stuck as easily in the deep stuff since it reduced drag - really didn't notice much of a difference in trail temps but then I'm lazy and I run cable ice scratchers and leave them down 100% of the time.

There’s been a couple posts about the MTNTK kit.

One guy damaged his enough to leak coolant.

I cut and welded mine 8” shorter.
It definitely heats up slightly quicker than a stocker.

The turbo has something to do with that also though.

I have no problems with scratchers down. (Oem polaris/ holz)

 

[Spaarky]

One of my friends just did his. Turned out very nice!!! Used short Skinz flap.

 

[damx]

I run with no snow flap and so do a few others with axys 800/850 and we have problems.

 

[Chadly]

I run no snow flap on a 155 with a 163 track and it over heats on ice. Soft groomers are fine but ice is no bueno. Good thing the only thing I hate more than ice is trails so the problem rarely comes up. 155 tunnel with 163 track and no snow slap actually does make quite a difference for getting the sled turned 180. I'm sold on it. However it's expensive and I would say it's probably not worth it for 19 out of 20 people.

 

[frntflp]

163 in a 155 tunnel and orig flap. Scratchers down on the trail to and from the fun. No issues.

 

[kylant]

my buddy has a really nice rigid one. i think it is made of HDPE. it is pretty short too. I'll ask him where he got it

 

[die hard poo]

I just trimmed my flap by about 4" and seems to work, but don't have many miles on it yet. I trimmed it above the lowest holes in the 2.6" flap.

 

[Havesledwilltravel]

I just trimmed my flap by about 4" and seems to work, but don't have many miles on it yet. I trimmed it above the lowest holes in the 2.6" flap.

I did the same on m SKS,.. seems to work well in the deep. Be forewarned, any amount of loose on a trail and you shoot a rooster tail back about 30ft, not healthy for anyone behind or someone that wants to pass.

 

[greasemonkey3406]

I did the same on m SKS,.. seems to work well in the deep. Be forewarned, any amount of loose on a trail and you shoot a rooster tail back about 30ft, not healthy for anyone behind or someone that wants to pass.

Notice much loss in cooling after doing this?

 

[Havesledwilltravel]

Notice much loss in cooling after doing this?

Not really, still around 95F in the deep with better snow evacuation. On the trail I was about 105F with about 2in of snow, no scratchers.

I should note that I have not modified my tunnel or installed a 163, but I would like to install a 163 in the next year or 2