Catch can

[Rich]

wait why would he need to get a new pcv valve and hose? isn't he just blocking off the intake manifold and then running lines to the catch can from the valve covers. theres no need for the intake manifold to valve cover line anymore so definately no need for pcv valve at all.

correct, no need for it.

Oh and Kosh, the crankcase is breathing through the head of the block, there are canals running through the block from the crankcase to the head which end up in the space above the head which are covered by the camcovers.

 

[Kosh]

Ahhh, so there is no pcv on the crank case. The only one is on the intake side cam cover and i'm replacing that anyway.

cool so can anyone help me out wit my CC set up then?

Also, i bought the CC off of driftmotion. It has 3 fitttings on it, 2 on top and one on the bottom. Which go where? do i use the bottom one for vacuum and the top 2 to go one to each valve cover? Or is the bottom one just for draining the can? thanks.

 

[Rich]

Ahhh, so there is no pcv on the crank case. The only one is on the intake side cam cover and i'm replacing that anyway.

cool so can anyone help me out wit my CC set up then?

In my book pcv means Positive Crankcase Ventilation, which describes the system to remove the harsh blow-by gasses from the crank case.

On our 1jz engines these fumes go to the cam covers like I described before. From these cam covers in the stock situation these gasses are removed in two ways: one on the intake side > the little hose between the intake cam cover and the intake manifold with the one way valve in between. And the second > on the exhaust side cam cover, that's the hose which goes to the intake Y-pipe in front of the turbo's.
The cam covers are also connected by the hose under the coil coverplate.

Both have their own downside; the one on the intake stops working when under boost and the one on the exhaust side sucks up oil fumes which crap up the turbo's and oil also condensates in your IC.

The solution is to connect both cam cover outlets togeter to a catch can and then put pre turbo vacuum on the catch can.
To optimise this system, mount the catch can in a cold place and baffle the inside of the can to maximize the condensation surface.

And Kosh, the lower connection is for drain, you dont want that hooked up to pre turbo ;-)

 

[Kosh]

And Kosh, the lower connection is for drain, you dont want that hooked up to pre turbo ;-)

lol thanks, so how do i cap that off then? stick a tube on it and cap the tube?

 

[AGlobalThreat]

Buy a proper sized cap and clamp

 

[jizake1jz]

so the bottom connection is for the drain. that means that the 2 line coming from the valve covers need to be connected into 1 line to connect to the catch can? and the other top port is for the line that runs to the intake?

 

[Rich]

Yep, that's correct.

For drain, it would be nicer to stick a little tap on it with a hose downwards then to cap it off. Once in a while you need to drain the collected oil and it's easy if there's a small tube going down, you set a can on the ground underneeth it and open the tap.

 

[OneJSupra]

In my book pcv means Positive Crankcase Ventilation, which describes the system to remove the harsh blow-by gasses from the crank case.

On our 1jz engines these fumes go to the cam covers like I described before. From these cam covers in the stock situation these gasses are removed in two ways: one on the intake side > the little hose between the intake cam cover and the intake manifold with the one way valve in between. And the second > on the exhaust side cam cover, that's the hose which goes to the intake Y-pipe in front of the turbo's.
The cam covers are also connected by the hose under the coil coverplate.

Both have their own downside; the one on the intake stops working when under boost and the one on the exhaust side sucks up oil fumes which crap up the turbo's and oil also condensates in your IC.

The solution is to connect both cam cover outlets togeter to a catch can and then put pre turbo vacuum on the catch can.
To optimise this system, mount the catch can in a cold place and baffle the inside of the can to maximize the condensation surface.

And Kosh, the lower connection is for drain, you dont want that hooked up to pre turbo ;-)

For the 1J, is there a one way valve on the exhaust side that goes to the intake y-pipe in front of the turbo. If there isn't, can you connect the catch can to the same intake y-pipe to get its vacuum.

 

[Rich]

For the 1J, is there a one way valve on the exhaust side that goes to the intake y-pipe in front of the turbo. If there isn't, can you connect the catch can to the same intake y-pipe to get its vacuum.

Nope, there's no one way valve on the exhaust side cam cover hose to the intake y-pipe.
And yes, for the stock set-up that would be the obvious place to connect the catch can to for vacuum.

 

[OneJSupra]

That's why I thought so thanks for clearing that up.