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Post by buntdeer on Feb 15, 2008 18:12:19 GMT -5
Hello all!
I just made and installed the high-flow filter for my ruck. And I was wondering about getting rid of the breather valve, and just running a small filter on the end of the hose...? It seems all the valve does is shut off the air supply when the engine makes enough vacume.... But when you run at higher rpms it's not really sucking in that much air anyways...
Just wondering... thanks!
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Post by chanito on Feb 17, 2008 14:42:14 GMT -5
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Post by Kami no Chiizu on Feb 18, 2008 19:20:05 GMT -5
You hafta put the URL between the code brackets.
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Post by buntdeer on Feb 18, 2008 19:22:39 GMT -5
 Okey doke. So this should help |
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Post by chanito on Feb 18, 2008 19:31:30 GMT -5
 I do not know why would you want to eliminate the PAIR system, but you couls just put a cap to replace the hose #5 on the side of the head, and another small plug on the side of the intake to eliminate the vacuum source, or you could just let the pair valve system alone and install a breather filter where hose #2 is Normally the PAIR sytem has a hose that goes to the fuel tank area under the floorboard and suck the gas fumes and send tham to the exhaust to be burn,  makes for a cleaner exhaust as it reduces the soot on the muffler
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Post by buntdeer on Feb 18, 2008 19:50:12 GMT -5
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Post by buntdeer on Feb 18, 2008 20:11:49 GMT -5
 The breather air flow never gets burned by itself... It mixes with the crankcase gases, and then exits the head to get burned in the engine. I'm sure the hose is by the tank to get any loose gas fumes, but it just needs air either way... all I want to know is why the breather valve is connected to the vacuum line... and shuts off at a higher vacuum? Will it hurt anything to have airflow all the time to the crankcase?? (I don't think it should...) but thats why I'm asking.. |
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Post by chanito on Feb 18, 2008 20:31:31 GMT -5
The pair valve send those vapor into the exhaust port, so the heat in there will burn any reamining fumes The crankcase breather is another hose that goes into the top of the valve cover  Hose 19 in your later diagram |
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Post by buntdeer on Feb 18, 2008 20:45:08 GMT -5
The pair valve send those vapor into the exhaust port, so the heat in there will burn any reamining fumes The crankcase breather is another hose that goes into the top of the valve cover Hose 19 in your later diagram chanito.... Unless my scooter is getto... The air exiting the head then goes into the air box, getting sucked into the carb, getting burned with the air/fuel mix ,and then exiting as exhaust gas.... There are no hoses that connect to the "exhaust port"..... I'm not quite sure if your understanding what I'm asking here....  Then only part I am asking about is the breather valve (shown in the first pic) and removing that, and just running a hose/filter combo to the reedvalve-intake portion of the head....  |
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Post by buntdeer on Feb 18, 2008 20:56:09 GMT -5
 This is what I'm wanting to do! Just remove the breather valve assy. Plug the vacuum port off the intake manifold. and just run this setup!! Prolly routing the hose to the back of the scooter, perhaps by the shock.... |
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Post by jedisabre7 on Feb 18, 2008 22:14:59 GMT -5
sure! I would just cut the hose down to an inch or two, slap the breather on, and be happy.
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Post by chanito on Feb 19, 2008 20:02:11 GMT -5
;D Your skil with the illustrations are great, congrats, we are confusing two separated system,one is the PCV system, which is the one with the blue arrows, and you are correct, the blow-by gases will exit the head and be send to the air filter housing to be burn in the combustion chamber, and the PAIR system, which is the one with the red arrows, this system uses the pulses in the exhaust to pull some fresh air into the exhaust port to burn any remaining HC on the exhaust, it uses a reed valve on the side of the head, this reed valve is a one way valve and does not allow exhaust to blow into the air filter housing, but just in case it leaks, it is not comunicated with the fresh air coming from the air filter and uses a small dedicated filter in the front of the air filter case, And yes you can do as you want and just install a dedicated filter there by passing the pair vacuum valve |
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Post by varroa on May 11, 2008 16:33:20 GMT -5
Chanito, i meant to ask...
in PCV system, what makes the air move through the crankcase? is there some kind of air pump in the PCV solenoid assemply?
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Post by chanito on May 15, 2008 19:47:20 GMT -5
Chanito, i meant to ask... in PCV system, what makes the air move through the crankcase? is there some kind of air pump in the PCV solenoid assembly? I answer this a while back in my FAQ, but any way: The pump moving this air is the piston moving up and down, as it is impossible to create a perfect seal in the combustion chamber, some pressurize combustion gases, sneak pass the rings and get into the crank case, a while ago those crankcases were open to the atmosphere and all those blow-by gases just vent out, concerns about pollution means that we have to get those gases out of our breathing air, the easiest way is to just send then back to be burn into the combustion chamber, our first generation PCV system is just like that, the gases blow pass the rings, collect in the crankcase and as pressure builds up it is push into the head and out a hose in the valve cover which send them into the intake hose to be burn, the problem is that in order for it to work properly the oil and water temp should be high so the blow by gases remain gases, so they are easy to burn, but as you know most people use the scooter for short trips, allowing those gases to turn into some nasty stuff contaminating your oil, messing your pretty crank bearings, so second generation was introduced in 06 that allows fresh air into the crankcase diluting those gases and making them easier to burn at a colder temp and preventing crankshaft bearing failure, the problem is that you want fresh air going in and the blow by gas to come out into the intake track, the solution is an electronic valve that allows flow of fresh air into the crankcase but prevent the blow by gas from coming back |
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