Breather?

[Meadzy]

Is this breather in photo 1 able to fit onto my 16 valve engine in photo 2,
I have been told it might be able to but i dont know where it would connect. I have circled on the photo 2, A or B where I think it could go, so if someone knows it would be greatly appreciated.

Thanks
1
http://img35.imageshack.us/img35/3649/img00140qa.jpg
2
http://img35.imageshack.us/img35/916/toyspeed0px.jpg

[Ae92typeX]

If one was going to do it, it will come off a or b. Where does each go?- I dont have that engine to view today (4af aye?) One will go into the filter box and the other into the carb (I think?)
Another thing to consider is getting a carch can and have it in-line with a filter ontop of that. this way you wont get fumes in the engine bay out of the filter.

[Meadzy]

Ok just checked, line A goes into the filter box and line B (i think) goes into the carb

[Meadzy]

Any knowledge appreciated

[RomanV]

Ok just checked, line A goes into the filter box and line B (i think) goes into the carb

This is how it works.

Basically fumes etc. would accumulate in the head if it wasnt ventilated.

So instead, the fumes get sucked into the carb, and burnt in the combustion chamber. The hose leading from the filter box to the head supplies fresh (filtered) air to the head.

So...

Air gets sucked from the intake box.... through the head (taking fumes with it!) and sucked through into the carb, and burnt.

I would assume that a breather like that is designed to eliminate the hose from the filter box to the head.

So you'd want to remove the hose from the filter to the head, block the hole in the filter box, and place the breather on the head where the pipe used to go.

Im not entirely sure what the point of this is however, I would assume that it is for when people use aftermarket intakes, and they dont want to have to tap a line for the air feed for the head.

[NZ_AE86]

Ok just checked, line A goes into the filter box and line B (i think) goes into the carb

This is how it works.

Basically fumes etc. would accumulate in the head if it wasnt ventilated.

So instead, the fumes get sucked into the carb, and burnt in the combustion chamber. The hose leading from the filter box to the head supplies fresh (filtered) air to the head.

So...

Air gets sucked from the intake box.... through the head (taking fumes with it!) and sucked through into the carb, and burnt.

I would assume that a breather like that is designed to eliminate the hose from the filter box to the head.

So you'd want to remove the hose from the filter to the head, block the hole in the filter box, and place the breather on the head where the pipe used to go.

Im not entirely sure what the point of this is however, I would assume that it is for when people use aftermarket intakes, and they dont want to have to tap a line for the air feed for the head.

Right, whatever you say! Very interesting!

[Meadzy]

sweet thanks alot!

[RomanV]

Sorry I cant say for sure if that is exactly how it works, but its how it works on mine.

It took me a lot of head scratching before I realised how it works.


Here is a picture....

There are two breather pipes on the head.
(The black hoses, next to the blue arrows!)

The arrow on the left, shows where fresh air comes in from the main intake pipe, into the head. The blue arrow on the right, shows how the air gets sucked out of the head, and into the plenum, where there is plenty of vaccuum.

The fumes from the head get burnt, and the vehicle technically has lower emissions than if it just dumped this oil to the atmosphere. This keeps governments happy.

However these fumes effectively lower the octane of your air/fuel mixture slightly, and contaminate the intake charge.
People install 'oil catch cans' inbetween the head and the plenum, to condense this oil vapour back into a liquid... which gets caught in the can, instead of going into your engine.

The downside being, that you have to empty the can all of the time.

[CozmoNz]

Cam cover, not head .

and oddy enough, if toyota went to the trouble of putting a factory catch can setup on the gen 3 3sgte, why couldnt they on the mighty vvt-i engine avilable in the gen 5 sw20?

Lesser effect on n/a engine... (well obviously octane rating is far more delicate in turbo engines).. but still, its only a few bits of plastic....

oh and most of the time its not oil that is in the catch can when you open it... its a watery mixture :S

[RomanV]

It's not extracting fumes generated by the cam cover, its extracting fumes generated by the head.
Well the top of the head at least, I suppose it does sound a little misleading.

Are you sure that it came with a factory OCC?
Pics?
You dont hear of that very often....

[Meadzy]

what do i do or use to block the hole to the filter box?

[CozmoNz]

Cori has her keys right now, so i cant run out to her car, but hers another gen 3 3sgte engine bay:



Obviously the big black sucker on the top is the catch can, for comparing reasons, heres a 3sgte without one:



they arnt "rare" all late model 3sgtes had them :S


what do you use? could wind a screw into the old hose...

[Meadzy]

ok thanks ill try that

[Meadzy]

ok what if I try make my own catch can, i have a pic of my brothers mates home made one, it only has one hose running into the can, is that all it needs?

[CozmoNz]

yeh, i hear people use the Mt Cadrona (down here anyway) Drink bottles, and just cut a hole in the side / top for the hose, and put a filter on the top.

[Meadzy]

so all i needis a hose running off the valve(valve A) on the rocker cover to a bottle or can?

[RomanV]

No, you need a hose going from the rocker cover to the bottle... and another hose coming from the bottle to the carb. You still need the vaccuum from the carb to suck the fumes into the bottle.

The catch can is just like a kind of 'filter' in the middle, but for fumes.

A lot of DIY catch cans stuff their bottles full of steel wool, this helps the fumes to condense. Otherwise they will more than likely just flow straight through to the carb anyway....

[Meadzy]

so its 1 line from rocker cover to can and 1 line from carb to can

[RomanV]

correct.

[Meadzy]

and is the valve from the rocker cover i use valve A or B