is this a hose air breather?
- Thread starter DING
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phalse
Registered
sometimes called a clean air mod. from the factory, cars and bikes these days have the crank case ventilated right back around to the intake/airbox. so the gases/vapors that can be found down in the engine below the pistons gets sucked into your intake in a closed-loop kind of way, instead of just venting to atmosphere (as in the past, before environment karens) like the guy in the pic is doing with his hose and little filter.
when someone puts a catch can on their sports car, that stuff is being rerouted so that the vapors and general gunk has somewhere to collect (the little can) which you just empty out every once in a while.
the guys bike in the pic isnt wrong, it just isnt best.. its best if the inside of the engine/bottom end like everything below the piston is subject to vacuum, which you can do with something called a krankvent. route the hoses to be on the shorter side instead of that super long goofy poop, you dont want hoses to be their own vessel allowing any significant amount of stuff to build up. then put a little foofoo filter on the end of the hose, just to keep things tidy, like the guy in the pic.
just dont zip tie it immediately above the wheel. dude probly has to clean his rims once a week, depending.
when someone puts a catch can on their sports car, that stuff is being rerouted so that the vapors and general gunk has somewhere to collect (the little can) which you just empty out every once in a while.
the guys bike in the pic isnt wrong, it just isnt best.. its best if the inside of the engine/bottom end like everything below the piston is subject to vacuum, which you can do with something called a krankvent. route the hoses to be on the shorter side instead of that super long goofy poop, you dont want hoses to be their own vessel allowing any significant amount of stuff to build up. then put a little foofoo filter on the end of the hose, just to keep things tidy, like the guy in the pic.
just dont zip tie it immediately above the wheel. dude probly has to clean his rims once a week, depending.
Bumblebee
Donating Member
I can't see any benefit whatsoever of this mod.......
I especially wouldn't want it running along my swingarm this way...the person in question went to great lengths to eliminate their rear brake (for whatever reason) and then reoccupied the space with an ugly hose and filter.....
I especially wouldn't want it running along my swingarm this way...the person in question went to great lengths to eliminate their rear brake (for whatever reason) and then reoccupied the space with an ugly hose and filter.....
Use pair block-off plates and connect the crankcase breather to the back of the airbox.
Or, plug the airbox and put one of those filters on the crankcase hose, but mount it around the throttle bodies or valve cover.
If the filter is low and you ride wheelies, some oil will come out, not a big deal, but not ideal either.
Or do the 'sucker mod', and route the crankcase breather to the pair valves directly(no place for a filter), which is good for a couple hp you'll never feel.
That setup pictured with the low filter is going to get dirty and clog, and block the crankcase from venting.
It looks like some uninformed person's way of trying to have something cool on their bike...but it is useless...and overpriced.
Or, plug the airbox and put one of those filters on the crankcase hose, but mount it around the throttle bodies or valve cover.
If the filter is low and you ride wheelies, some oil will come out, not a big deal, but not ideal either.
Or do the 'sucker mod', and route the crankcase breather to the pair valves directly(no place for a filter), which is good for a couple hp you'll never feel.
That setup pictured with the low filter is going to get dirty and clog, and block the crankcase from venting.
It looks like some uninformed person's way of trying to have something cool on their bike...but it is useless...and overpriced.
phalse
Registered
yeah venting the crankcase to the pair valve stuff is the elegant way to do it BUT some tunes such as 2WDW specifically say you need blockoffs for their tune, so there goes that. for btmoto you don't, at least not my previous bike.
the harley guys for years would just vent/connect directly to the exhaust. that doesn't count as vacuum because its not, but the flow through the exhaust would keep the stuff from the engine case sucked out well enough.
however, i'm not sure that's so great either on this bike, as anyone running dual exhausts on the busa is basically venting all that gunk to your exhaust which ends in an upward angle, right? so a small amount of that crud is gonna build up in the pipe at the point where the exhausts angles upward. no good solution so just connect it all up the normal way but without a super long hose like in that pic. short hose with krankvent and little filter on the end, tucked outta the way but serviceable every so often is the way, imo.
the harley guys for years would just vent/connect directly to the exhaust. that doesn't count as vacuum because its not, but the flow through the exhaust would keep the stuff from the engine case sucked out well enough.
however, i'm not sure that's so great either on this bike, as anyone running dual exhausts on the busa is basically venting all that gunk to your exhaust which ends in an upward angle, right? so a small amount of that crud is gonna build up in the pipe at the point where the exhausts angles upward. no good solution so just connect it all up the normal way but without a super long hose like in that pic. short hose with krankvent and little filter on the end, tucked outta the way but serviceable every so often is the way, imo.
Instead of the filter on the end of the crankcase hose, just run the hose into the back of the airbox
pffft...rear brake he says...one rotor on the front does the trick it...so it seems...lmao
But seriously, that's how the roll racers do it now, me, I like 3 rotors, and actually use the rear brake too...but apparently one rotor will slow you down from 180mph...lol
phalse
Registered
i dont know what you mean by this. the whole point of this mod is that the various crap such as oil vapors are NOT being fed back into the intake of the bike. this is how cars and bikes come from the factory these days, anyone can just look and youll see the hose leading to the intake from the crankcase. no thanks.
you want this crap either expelled from the engine entirely in the form of the usual hose with a little filter on the end, simple as can be and thats it (although slightly janky) OR something more elegant such as when people install a catch can on a sportscar.
on bikes, that second way is usually done in the form of some kind of hose letting all that crap go directly to the exhaust, being removed from and thereby bypassing the engine entirely. and sure as hell not going to the airbox.
another slick method to do it that second way, yeah, is plumbing that gunk straight into the pair valve assembly so that it gets fed into the exhaust stream but as above, the issue there is that at least some tunes require blockoffs so that may interfere. dunno, not dug into mine yet.
one way or another i dont see how any of this should go to the *airbox* (intake, whatever) and if you meant skipping the engine entirely by doing it the pair valve way, then yeah that might work. guess i myself will find out the quick and easy way soon =D
The crankcase breather gets connected to the part of the airbox that has the black fiber mesh square...the one that is meant to catch oil.
And oil isn't going to just blow up the crankcase breather hose anyway.
I will take a picture later as to where to connect the crankcase breather hose to the airbox, as I have the airbox out of my Gsxr1k right now(the Gsxr and Busa design are the same).
And, here is the 'Sucker Mod' that connects the crankcase breather to the p.a.i.r valves directly, and the empty hose port on the airbox gets a rubber cap to block it, basically the same as the clear cap that is for the airbox oil to be drained.
With p.a.i.r valve block-off plates on the valve cover, and the p.a.i.r hose blocked on the airbox, the crankcase breather remains connected at the rear of the airbox, as said where the small mesh filter is to catch any oil, which will be minimal at best.
phalse
Registered
thats interesting. yeah i dunno anything about a piece of mesh material inside the intake of this bike, ive not cracked anything open on this. i think my bike has about 1500 miles. if it were the yamaha i could tell you all about it =D
in any case, that pair valve connection is probly the overall best way to do it but only if not running blockoffs, of course. so at least in my case, no option unfortunately so i think i'll just route my venting to the exhaust, along with a krankvent.
to find the right bung/fitting to route a hose to the exhaust (using one of the O2 bungs), just use mcmaster as they have everything. can be tricky to find sometimes though, since the amount and variety of stuff they have is absurd.
in any case, that pair valve connection is probly the overall best way to do it but only if not running blockoffs, of course. so at least in my case, no option unfortunately so i think i'll just route my venting to the exhaust, along with a krankvent.
to find the right bung/fitting to route a hose to the exhaust (using one of the O2 bungs), just use mcmaster as they have everything. can be tricky to find sometimes though, since the amount and variety of stuff they have is absurd.
Venting the crankcase to the exhaust?
The exhaust pressure will be more than what's coming out of the crankcase vent, so it will just pump exhaust gas through the crankcase.
Bumblebee
Donating Member
This thread hopefully answered @DING 's question but it sure took the long way around...
I have found my vent to be located in the factory location and it hasn't caused me one bit of grief in being there.....
If it were me, I'd leave it where it was supposed to be and call it a day, then focus on something else.
I certainly wouldn't route it in the location depicted in the picture.....
I have found my vent to be located in the factory location and it hasn't caused me one bit of grief in being there.....
If it were me, I'd leave it where it was supposed to be and call it a day, then focus on something else.
I certainly wouldn't route it in the location depicted in the picture.....
Yep, either leave it be, use p.a.i.r block-off plates and route to the airbox, or with a filter on the end of the crankcase breather mounted up near the valve cover, or do the sucker mod.
phalse
Registered
that pressure is not exerted the same at all times, and there's pressure loss closer to the end of the pipe. the exhaust gasses would have to magically make a 90 degree turn entering the wrong way "up" the exhaust bung and travel up the hose to the crankcase. its not a thing. harley guys have done it for who knows how long.
and like i said, you put a krankvent on the hose coming from the crankcase. nothing is permitted in, only out. that thing is awesome =D
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