Final Words
So, here is my take on what I have done and why I did it.
Prior to changing my intake and adding venting I researched the **** out of it and asked a lot of questions on SnoWest. I also paid real close attention to the sled reviews and pics in the magazines.
I got the ideas for a lot of the things I have done from professional sled builders such as Volk and the mods he has done to Burandt's machines.
Multiple shops/people have commented about the stock air intake being the best as far as performance goes. They very well might be right however, my feelings are that the extra couple of horses
the stock cold air intake provides really don't matter if it is completely choked off due to snow on the "shelf". That led me to decide that I'll sacrifice a little power (maybe) to have a machine which won't intake bog.
My venting has been a work in progress.
I first added the stock vents to the nose cone. After a couple of days of riding in deep snow I did experience bogging cause not enough cool air was being taken in. So, I added more vents.
I got some snow under the hood so I added more vents and so on. You are looking at 3 seasons of adding vents. I haven't experienced any "hot air" bogging in the last year and a half.
So, I feel what I have done works extremely well without adding the block off shelf that some of the aftermarket kits have. Example: Volk ($450ish), Black Box ($400ish).
To me the shelf recreates the "plenum" of the stock system. I feel the machine would run for a little while just off the fresh air inside the stock air box, if the vents were covered,
then once that air ran out the machine wouldn't run. So, if your nose cone vents were covered with the shelf on it will run for a bit then get choked off or try to pull air from the engine
compartment but that won't work too well cause you have tried to seal it real well. If my vents get plugged I will draw air in from the engine area and the machine won't run at its
optimum but, and a big but, it will still run with ample power.
My theory is this: while in motion air flows in through the front venting and enters the air intake system. The incoming air is pushing all hot air up and out the back of the machine and that hot air
won't be moving forward and into the intake unless the machine isn't moving. At that point I really don't care too much cause I ain't moving. (Prior to this season I'll be adding vents to either
side of the speedo to aid in the expulsion of hot air.) I also removed the stock vent screens from their stock locations and added pet screen cause I don't think the flowrite material allows for easy air flow.
Let me just say this; The venting that I have done probably isn't for everyone. I live and ride out in Washington where we have extremely wet snow compared to other locations.
So, I don't have to worry about the really powdery snow that can make it through my vent system and the light, powdery snow probably won't sit on the "Shelf" and cause my problems to begin with.
And again, I do not/have not experienced any bogging (intake or exhaust) to date with all the vent/intake/exhaust mods I have done to my machine. And, we had some REALLY deep days last season.
Mr. Monkey: Thanks for the comment. I don't think I really get too much more snow on the speedo. The small windscreen seems to deflect most of it. The only snow that sticks to the speedo is the blow around the
windscreen stuff and that would stick to it in the stock configuration.
1 more thing: I added foam weatherstriping between the nose cone and the hood in the very front. That seems to be the only place where the hood and body don't have a good seal. Worked really well and its cheap.