Running Stock Air Box without hood ducting?

[TheBreeze]

Does anyone run the stock air box with the hood ducting removed and prefilter over the intake opening where the bellows attach? Good results? I would add some vents to the hood (center hood vent and headlight vents). I already have a speedo vent and a rkt hood lift. I am not looking for a preformance gain but also do not want to loose power, but I am interested in lightening up the 50 lb stock hood. I do not want to use an aftermarket intake. Thoughts?

 

[WyoBoy1000]

heard of lots of people doing it when running without a hood, but with the hood all the heat you would draw in deep snow would be a disadvantage, but it comes down to personal preference.

 

[ACMtnCat]

This type of thing would work for that!

 

[JHG]

One of the problems with just adding the prefilter is that when you stop and no air is moving under the hood it will usually bog and stumble when you first take off until cold air starts to move under the hood again. If you can isolate the airbox from the motor and pipe it works a lot better.

 

[Shelfrost]

This type of thing would work for that!

That looks interesting! Is this a production item and where can you find it?

 

[winter brew]

I ran stock airbox with a mesh hood, that is the ideal setup IMO. I ran shop-vac foam filter material over the inlet. Don't use flo-rite material directly over the inlet, it is too restrictive and also collects snow dust.
I wouldn't go this route with a stock hood though, too much heat.

 

[Vern]

I ran stock airbox with a mesh hood, that is the ideal setup IMO. I ran shop-vac foam filter material over the inlet. Don't use flo-rite material directly over the inlet, it is too restrictive and also collects snow dust. I wouldn't go this route with a stock hood though, too much heat.

and it also lets snow and water through.

i tried this exact thing last season, put prefilter over the hole in the air box and removed the plenum. i have hood vents so i figured it would get pretty good air, the problem was that it just happened to be one of the best powder days of the year with dry fluffy powder and anywhere it could find a way under the hood it did and went straight throught the prefilter and bog. bad bog like the sled wouldn't even move kinda bog, pulled the prefilter off the airbox and it was full of ice. cleaned it out and tried to seal up some of the hood better but as soon as i hit the pow again, bog. now it woulda been a simple fix, but me bein the dipsh** i am i forgot to bring the plenum with me and ended up ruining what coulda been one of the best pow day of the season.

 

[89sandman]

i ran mine like this all last year, no problems. wouldn't put a vent above it in the hood the melting snow would fall right on it and get sucked through. i run a speedwerx bra on the front 2 hood holes and petscreen on the next 2. here in oregon we don't get much dry fluffy pow...

 

[Ausm7499]

I am contenplating pulling the airbox and boot that the airbox conects to and running air filters directly off of the throttle bodies. Has anybody done this? I guesss I am looking to eliminate more weight and add some performance over the other aftermarket intakes. I like the concept that CPC has but don't want to pay that much money.

As far as using just the stock airbox I run without a hood in the spring and just put pet screen over the intake hole. The only problem with the pet screen is that snow does get through it and the motor ends up consuming quite a bit if its not rock hard snow.

 

[Killerk]

Do a search under "homemade air intake"
Lots of good ideas... Covering the air horn is too restrictive, and snow dust sticks to it... For it to work you need a LOT of surface area.
I pulled the hood plenum and run a duct hose throught the speedo hole.

 

[minet]

/shrug

from my reading, you need something like 1.2 ? (i cant remeber the exact number,, could have been .8 ) X the case volume in front of the throttlebodies.

that boot is just about that mutch almost..

that said ,, try it and tell us what happens

 

[007]

I had tried that system on my m-7bb before I went to the snopro intake and with prefilter material over the stock intake it LOST almost 10hp on the Dyno!

If your doing that you are losing hard earned hp!

 

[moderatebill]

I ran the snowpro intake for one year and then switched to timbersled. Both worked the same, but I like the timbersled because the filters protect a little better. Both suck some underhood heat if not moving, but not a big deal.

 

[WyoBoy1000]

something to take into perspective
A big part of 2 strokes depend on the air speed going into the motor, sometimes smaller is better and sometimes bigger is better, filters on the throttle bodies don't give enough room for the air to speed up and create a vortex, in all reality every time the barometric pressure changes(temp. elevation, ect..) you could be loosing power or gaining power due to the air speed. it also changes when other mods are added. You have to have a tuned pipe to get power out of a 2 stroke same goes for the intake.

 

[Ausm7499]

Ok Mac since I don't know shiz about 2 strokes I maybe wrong but I assume all combustion engines operate the same when it comes to air intake. I guess the way I think about it is my motor on my pickup, motorcycle, lawn mower, etc.. all have some sort of air filter and typically a small air box compared to my sled which has a huge air box and air boot with no filter. I don't like the fact that there is no filter as objects could easily be ingested by the motor. I don't see the need for a big air box and air boot if a guy could just put filters on each throttle body. Timbersled's intake system is much like what I am talking about except they didn't remove the air boot. I want to ditch the air boot and just run a seperate hose from each throttle body to each filter.

Would this work or am I waisting my time?

 

[WyoBoy1000]

Ok Mac since I don't know shiz about 2 strokes I maybe wrong but I assume all combustion engines operate the same when it comes to air intake. I guess the way I think about it is my motor on my pickup, motorcycle, lawn mower, etc.. all have some sort of air filter and typically a small air box compared to my sled which has a huge air box and air boot with no filter. I don't like the fact that there is no filter as objects could easily be ingested by the motor. I don't see the need for a big air box and air boot if a guy could just put filters on each throttle body. Timbersled's intake system is much like what I am talking about except they didn't remove the air boot. I want to ditch the air boot and just run a seperate hose from each throttle body to each filter.

Would this work or am I waisting my time?

I never said you don't know anything, and I usually back you up, but a tuned 2 stroke is not like any other combustion engine. Hooking a filter straight on the throttle bodies restricts and disrupts air flow and I think it would be a disadvantage( I maybe wrong ). If you hook a hose in between the two I would think there is a lot better chance of it working due to the increased volume. Some people don't have a fuel controller to correct any fueling issues and you do, I'm just giving info for everyone. Try it and let us know

I'm all about building chit on my own but I think the bdx(only one i've tried) is reasonably priced, doesn't weigh anything, draws cold air and works great. in other word I think it would be a waste of time, my .02


heres one thread I found with more info
http://www.snowest.com/forum/showthread.php?t=102522

 

[Ausm7499]

I was saying that I don't know **** cause I don't but I may give it a try anyway. I agree with you though that if my idea doesn't work I will be going to the black box as its probably the best bang for your buck. I need to gut everything out and see if I can come up with some parts and hoses that will fit those throttle bodies. My only other question is how much is the warmer air from the motor really effecting the hp? I know cooler air creates more hp but its it that significant. I just don't want to drill the shiz out of my noze cone and on top of that I have a skid plate so that makes it even tougher. The only place I am willing to cut out is the little area in the shock tower that goes to the noze. Would that be sufficient?

 

[ACMtnCat]

I run a skid plate with my CPC air box. I just cut off the side wings up on the side of the nose and it works great.

I also have a Black Box for sale your interested. Cheap!

The old King Cats used to run great with the filters on the throttle bodies, why not the M lay down motor?

 

[Ausm7499]

I run a skid plate with my CPC air box. I just cut off the side wings up on the side of the nose and it works great.

I also have a Black Box for sale your interested. Cheap!

The old King Cats used to run great with the filters on the throttle bodies, why not the M lay down motor?

If my idea doesn't work I might be asking you about that black box. I don't see why my idea won't work but it will take a little fabricating to make it work well. I want to be able to run it without a hood as well and that will mean I will have to build a cover to isolate the noze cavity from any snow. If I wasn't such a cheap azz I would just buy the CPC kit and make a few mods to it but I refuse to spend that much. I don't have time to work on this mod right now but when I do it I will take some pics and keep you guys posted.

 

[WyoBoy1000]

one thing to think about, if you run hose in between the filter and T/B it needs to be stiff enough not to collapse,
I didn't like drilling the holes, but it's held up pretty well even after a good hit.

Does the cutler design attach to T/B or on the tube where the stock air box does,

site for filters http://www.autoanything.com/air-filters/10A50371.aspx