Maddog419, where did you hear that you will lose hp with Jerfinds setup? I know Mr. HP and the others proved that a carb mount filter is not the way to go, But Jerfinds setup is not a carb mount filter, it utilizes the airbox tube. The lectron does not use a vacuum like the stock CV carb. So why the power loss? With Jerfinds setup, we retain the smooth air flow route and expose the filter to more fresh air.

 

Real Time Test::::Fellas, I will take a TM48mm w/direct carb mount K&N--- And I will take a 48mmHV lectron with snorkle with bigger K&N and test them both out against each other On a real steep sand hill THIS WEEKEND, with hopefully a radar gun, and or other bikes( and this will include other forum members)..Both will be on the same fuel (gas) and both will be dialed in to the max... How about it?

 

nice mod jerfinds. thanks for sharing. I will be doing something very similar.

 

i think i'm going to try a plug from the inside on the vent hole then an outside one as well don't like the idea of that area opening up.

 

I, and many others, run the crankcase breather in the hole on the side of the snorkel tube. There is no downside to this.
1) When the piston travels down on the intake stroke, air must be purged from the crankcase to accomidate the piston's displacement, and this purged air is pushed directly into the path of suction in the intake boot.
2) When the piston travels up on the compression stroke air must be drawn in to the crankcase, there is no longer suction on the intake boot at this time and the air that is drawn into the crankcase is filtered right through your K&N.
3) On the fire stroke there is no suction in the intake boot either because all the valves are still closed, and displaced air along with any emissions blow-by that escaped around the rings during firing is disharged into the intake boot just as easily as it would be discharged anywhere.
4) Then on the exhaust stroke the crankcase breather easily allows air to be drawn in again through the K&N as the piston travels up because there is still no vacuum on the intake boot.

Now you can argue that the valve timing overlap at the end of the exhaust stroke will interfere with crankcase breathing on every other rpm, but I really don't think so, and even if it did an infintecimal amount its probably counteracted by the aid it gets during the intake stroke anyway, and either way I seriously doubt a dyno would show it, but even if the dyno does show it I don't mind because I never have to worry about an oily mess with dust and sand all over it from running a small filter on the end of the breather hose like I used to do. And in case you're wondering, there is no mess inside the carb from condensed oil or emissions, it stays clean as a whistle inside, unless you have a bad wreck and roll the quad, in which case you may get a small amount of oil in the boot.

 

To Sandaholic:
On Jerfinds intake set-up it's still just a round tube, that only so much air can flow down it.
Like trying to breath thru a straw, or you can look at it this way. Take a piece of paper and
roll it up so it's only 1/2" round. And try to breath thru it, now roll it up that it looks like a cone
with the 1/2" hole still.
Which one gives you more air. Thats also why I said earlier that a clamp-on will only make you lose
H.P. on a stock C.V. carb. Even on a lectron carb you would be limting the air-flow if it went thru a
tube set-up. Hope this will help some of you guys out.
And I'm not trying to make anyone mad. The intake tube on the predator would be a lot better
set-up for you.

later

 

maddog you must be misunderstanding what you are seeing in the pics of the DS intake tube. the end where the filter clamps is over 4" in diameter - it is a cone like that which you speak of. If you incorporate some math and calculate the surface area of the filter end of the DS intake and compare it to the surface area of your predator intake on the filter end I think you will see that it is no greater, and therefore flows no more. The predator intake would not be much better, it would only be something of a hassle to try and incorporate on the DS due to the physical dimensions and funky flat/oval filter end that may not suit the frame construction of the DS.
The only possible advantage of the predator intake is that the earlier DS models have a less rigid intake boot that will partially collapse at rpm's over 7,000. The predator intake is rigid plastic so it cannot collapse.

 

Maddog, the Predator intake design is really not as good as the DS. It's shape is the result of limited amount of space under the seat, and the fact the factory airbox volume is to small. The oval design allowed seat clearence and added a slight amount of volume to the airbox. The Predator airbox is set to far back from the carb for optimum performance. Has anyone tried a 4" Tornado installed at the rear of the snorkle right in front of the filter.[img]i/expressions/face-icon-small-wink.gif[/img]

 

All i know is that i race brown 650's alky ds with the 45mm and i beat him for about 200 yards on buttfunges' quad with the 46hv on gas His quad will all out pull hard from bottom to top

 

Buttfungus's bike must be running awesome?