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Discussion Starter · #1 ·
Two hose that go to air cleaner. What are they for? I have seen a picture with them capped. One goes to the engine and the other to the oil reservoir.
 

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Discussion Starter · #2 ·
Alright. I removed them. Both. The performance gain was HUGE!! I put a crank case filter (K&N style) on the oil reservoir and the other hose I ran to the back that came from the crank case.

I asked neighbor to come out as I had previously raced him before on his son's 2006 Scrambler 330. He won by about 2 quad lengths last time. So, we lined up and wife walked out laughing. Two old guys about to run them...lol. Beat him. Wow. I was impressed. I beat him by 2 quad lengths now.

The only think I can think of is, I am tricking the EFI into thinking the Ranger is cold? Since only cold air comes in now and the tubes aren't hooked into the air box anymore it thinks the Ranger needs to run richer and gives it more fuel to warm it up?

So, called dad up. Parents live about 2 miles from us. Told him. He is bringing his '07 Ranger XP down. Last time we raced he beat me by about 6". All of us are equal riders too! I'll post back tomorrow.
 

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Discussion Starter · #3 ·
Here are some pictures. Instead of leaving the one hose just dangle I put both hoses into a K&N filter. Instead of them going into the cannister, they go into the K&N filter. Curious though. Why the hose on the oil reservoir from the factory? Is is to cool it down? If you look, the hose goes into cannister from the engine, then the other side leads into oil reservoir. Are both putting hot air into the cannister or is the engine putting air into the oil reservoir to cool it? Anyone?
[image]http://host137.ipowerweb.com/~skoutrac/images/AirIntake1.jpg[/image]
[image]http://host137.ipowerweb.com/~skoutrac/images/AirIntake2.jpg[/image]
[image]http://host137.ipowerweb.com/~skoutrac/images/AirIntake3.jpg[/image]
 

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It's fair to say that the tube from the oil tank allows gas pressure that build up in there to vent. And since venting engine/oil/etc gases is an emission problem (EPA) this recycles those gases through the engine where any hydrocarbons can be burned. Your car has the same thing.

I'd think that if the other line runs to the crankscase, it serves the same fuction. It will allow blowby gases and volatile gases from the oil/etc to be recycled and burned.

On the flip side, if the oil tank or crankcase is in a vacuum condition and needs air, it allows air to enter that has been passed through an air filter.
 

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I'm curious as to what the others who are replacing the air cleaner case with a direct connect K&N/Uni are doing with these 2 smaller hoses. Anyone who's done this mod care to comment?

-Tim
 

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Discussion Starter · #6 ·
Will my set-up work? I see steem coming out of the K&N filter every so often. Like a tea pot effect. The crank case air blowing all the time and the oil has steem coming out always not as much as the crank case. The first way I did it was left the crank case tube on the side and it blew out and the K&N right on top of the oil box. Then I thought, the factory way was two hoses lead into a filter and now I have it this way. I really notice a difference and would hate to put it back. Anyone else do this? How did you do it?
 

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Discussion Starter · #8 ·
Thanks buddy! I am going to switch the K&N and put it at the top of the "t" and the oil line on the "leg" part to maybe cause a vacuum to get ride of some heat from the oil. I'll post back.
 

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Discussion Starter · #10 ·
In my opinion it worked. Seemed cooler. I didn't get to run any local sand hills. I will try this weekend. But, in short at this momment it seemed to work! I put some paper over the hose and could see the paper "pulsing" back and fourth. Probably from the air coming from the crank case I assume. I will also post pictures.

Footnote: I did replace stock air cleaner with a UNI-Filter. With my company we notice a huge gain with UNI over K&N. I also just changed the oil & filter (11hrs) with synthetic oil.
 
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I don't think it's the coolness. I'm coming from the sport quad world and I have always eliminated my air boxes and used K&N filters. Some do not like the K&N filters but if you maintain them "PROPERLY" they work great. The K&N just flows much more air than the stock filter and this is where you are picking up your hp. Now if these things are like sport quads you can add a new header and exhaust and pick up quite a few more hp. Top that with a new CDI and you'll be screaming.
 

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Discussion Starter · #12 ·
Agree. I do that for "Chinese" quads for a living (3.5 years now). Web link below. Not into the EFI thing though. See, I have tested a lot (www.paylessQuads.com is our other web site we own) and a jetting is needed to get a lot more power. Exhaust/intake alone is a small amount VS if you add jetting to the mix. See, without the exhaust, you can't jet as much and thus you get less power. So, they all go hand-n-hand.
 

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I think that the two hoses are for a type of PCV system and what you are seeing is the oil/gas vapor coming from the crankcase. If you don't want to hook them back up or want to change the way you do it, try this.

See if you can find a crankcase valve for a Harley, such as a Hayden Krank Vent or something like that. These cause a vacuum effect in the crankcase and relieve the pressure under the piston. This also lessen blowby and seat the rings better. It is good for about 5-7HP on a slightly modded Harley.
 

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This is the one I have on my Springer. It is cleanable; sometime the vapors condense and gets milky.

http://www.haydensm6.com/kvp.htm

I would tee both of the lines and then run it into this vent.
 

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Discussion Starter · #16 ·
What is the difference from what I did?
 

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Other that not having that type of valve. Nothing, maybe you could use a PCV valve instead. The reason that they use this type of valve on a Harley is that the pressure in the crankcase is quite a bit since both pistons fall at the same time. I don't know about the 700 or the 500. I would assume the 500 has some since it is a single piston.
 

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Discussion Starter · #18 ·
I think it is a single cylinder. The blow by isn't that strong. Maybe that's why the filter works?
 
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