pcv routing (location of orifice)

[suprra_girl]

and how they work...........

i'm getting really sick of researching this LOL

i've looked all over google and the tsrm

in the 7mge it would appear there are two orifices in the tb, would someone with a 7mge tell me which covers go to what orifice or how they are plumbed up

i notice with the gte that it only has one... that the tsrm shows anyhow
now i know how the pcv is all fitted on a gte but what sucks n blows and when?

should you be able to suck and blow thru a gte orifice in the tb?

are there any orifice's in the cam covers?


now for the reason i ask

we have a 1ggte which shares many similarites to the 7mge as far as electronics go so i'm assuming that mechanically they would also be similar.

anyhow... in stock form the 1ggte intake side cam cover has two ports, a lower one and a top one (the valve cover has a large hump at the back where the oil cap goes on) the lower port goes to the port on the tb and the top side goes back to the intake.

would this suggest there is an orifice in the cam cover? if not... how does this one work?

Thanks for any input

and any high res pics of stock pcv routing on a 1g would be appreciated (godspeed?)

Thanks

 

[CRE]

The PCV system on the 7M-GE is slightly different from the GTE in that the PCV routes from both cam covers into one pipe (that much is the same with the GTE), and from that one pipe into the throttle body. The GTE's PCV system opens into the intake before the turbo. The TB on the GTE is under pressure, it's not a vacuum source.

On both the GE and GTE both cam covers have a PCV bung. The Crankcase is vented into the intake cam cover by the oil cap.



EDIT: I may be wrong on the GTE's routing... the pipe which picks up from the two cam covers has a second outlet. I don't know where it connects. http://www.cygnusx1.net/Supra/Library/EPC/291420/catalog.aspx?Figure=1201&Page=2

 

[suprra_girl]

so in order to effectively work pcv on the 1ggte we would need to...

tap a thread into one of the cam covers and send that to the intake (with or without a pcv valve?) and leave the port on the other cover going to the tb?

how does the orifice's work? when boosting does the tb then suck in the vapours and under vacuum the tb shuts and the turbo then sucks it?

thanks

 

[CRE]

I'm sorry, I jumped in before knowing what all you were asking. I'm not completely familiar with the PCV setup on the GTE.

That said, on the GE the PCV system routes into the TB (a vacuum source) and doesn't have any check valves. The higher the RPM the more vacuum applied to the crankcase. The PCV system needs vacuum to work... it's possible the second outlet on the GTE's PCV piping runs through a check valve to another intermittent vacuum source.

Hopefully someone with a GTE can fill in the blanks for you.

Does the 1G-GTE not have a PCV setup? Or are you trying to figure out where misplaced hoses go?

From what it looks like in the EPC pic, it seems the second outlet on the 7M-GTE's PCV goes to a port on the surge tank (upper intake manifold).



EDIT: Oh, I do recall some members saying that they capped off the location where the second PCV connection is when installing their catch cans. In that case they'd be setting it up like an N/A's PCV system by just running the single PCV line from the two cam covers to a constant vacuum source (ie: intake piping, before the turbo).

 

[suprra_girl]

yea trying to figure out misplaced hoses basically

just need basic operation of turbo pcv so we can then install/work that system on the 1g

just the thing im unsure of is for the cam cover going back to the turbo... would that need a one way valve?

 

[CRE]

I'm pretty sure any hoses that are freely open into the cam cover would require a check valve... I might be missing something. Does the engine run? If so connect a vac guage to the line to the turbo and see if it generates a constant vacuum or not.

 

[starscream5000]

This may help, it may not, but when I installed my oil catch can on the 7M-GTE I capped off the vacuum on the TB and plumbed both nipples on the cam covers into one line and ran that into the catch can inlet. I then plumbed the outlet into the accordian hose (pre turbo). All lines where free flowing and open with no check valves. This is how most people set theirs up that actually know how to do it right .