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Discussion Starter #1
I noticed that my engine has a PCV plumbed between the forward valve cover and the intake manifold.
Do any of you 2GR-FE people have a catch can installed to keep the oily residue out?
 

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I built one for my car last winter. I hate emptying catch cans, so I built it to drain back to the sump. Moved the PCV valve to the can, so as far as the PCV system is concerned the can is part of the crank case.







So far it seems to be working really well. I'm considering producing them... so if the design appeals to you let me know. Could also be run without the drain back of course, but for a track car I would really recommend the drain.
 

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Alex, I'm surprised you mounted that to the chassis with everything going to the engine. it would seem that mounting it on the engine would allow you to make shorter hoses and have less relative movement. It does look like a nice setup though. Personally i've never run a catch can on any of my race cars, i haven't found it to make enough of a difference to be worth having more hoses/failure points in the engine bay.
 

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I've seen several stock 2GR engines in the shop and anytime I have the plenum off for whatever reason - valve cover gasket, coil, injector, cam sensor - these things happen on daily drivers - I look and I often find that the intake ports and the valve stems are gunked up with oily residue/tar/paste. Sometimes I've been able to scrape out mothball sized chunks of goop. I believe that a catch can can help to prevent this, that's why I have one on my car.
 

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Frank, I don't do work on other people's daily drivers so i'm not the expert here for sure but i'm really shocked to hear about intake valve gunk on a port injected engine. Those things get doused in gasoline constantly so they should stay relatively clean, no?
 

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Discussion Starter #8
I've seen several stock 2GR engines in the shop and anytime I have the plenum off for whatever reason - valve cover gasket, coil, injector, cam sensor - these things happen on daily drivers - I look and I often find that the intake ports and the valve stems are gunked up with oily residue/tar/paste. Sometimes I've been able to scrape out mothball sized chunks of goop. I believe that a catch can can help to prevent this, that's why I have one on my car.
Different engine, but my 140,000 mile 3S-GTE had unbelievable amounts of crap in the intake mani and the combustion chamber was gunked up as well. I definitely want a catch can for my 2GR-FE.
 

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Different engine, but my 140,000 mile 3S-GTE had unbelievable amounts of crap in the intake mani and the combustion chamber was gunked up as well. I definitely want a catch can for my 2GR-FE.
On the 3S-GTE (and most engines of the time) you had EGR gasses going into the intake manifold. That's what that crap is and it's really nasty stuff. On the 2GR the ECU uses the VVT-I timing to leave exhaust in the combustion chamber instead of extracting it and sending it back into the intake. Most modern engines have some technique to vary the left over exhaust gases in the combustion chamber to avoid sending it back through the intake.
 

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Frank, I don't do work on other people's daily drivers so i'm not the expert here for sure but i'm really shocked to hear about intake valve gunk on a port injected engine. Those things get doused in gasoline constantly so they should stay relatively clean, no?
That's what you would think. Environmental factors maybe? I don't know.
 

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Outstanding, guys ! And yeah Alex quote me a price.
I'm currently working on cleaning up the design so it is easier to produce, and need to have a local welding shop take a look at it. But hopefully in the next couple of months I will have something more solid. I also need to make sure it will fit in the location shown with the stock heater core pipes in place. I think it will, but I'm not positive. That and I think the stock starter cable goes right through there. That's not too hard to move a little, but if possible I would prefer to clear it.

Alex, I'm surprised you mounted that to the chassis with everything going to the engine. it would seem that mounting it on the engine would allow you to make shorter hoses and have less relative movement. It does look like a nice setup though. Personally i've never run a catch can on any of my race cars, i haven't found it to make enough of a difference to be worth having more hoses/failure points in the engine bay.
I thought about it, but it just didn't seem like it was going to work out as cleanly. The can tucks up against the firewall pretty nicely.

Frank, I don't do work on other people's daily drivers so i'm not the expert here for sure but i'm really shocked to hear about intake valve gunk on a port injected engine. Those things get doused in gasoline constantly so they should stay relatively clean, no?
My 2GR (even with only 30k miles on it) had some gunk in the intake ports when I got it as well.
 

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Discussion Starter #12
On the 3S-GTE (and most engines of the time) you had EGR gasses going into the intake manifold. That's what that crap is and it's really nasty stuff. On the 2GR the ECU uses the VVT-I timing to leave exhaust in the combustion chamber instead of extracting it and sending it back into the intake. Most modern engines have some technique to vary the left over exhaust gases in the combustion chamber to avoid sending it back through the intake.
So ...what purpose does the PCV serve on the 2GR-FE?
 

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So ...what purpose does the PCV serve on the 2GR-FE?
The PCV is basically just a variable valve. At high vacuum levels it closes to prevent too much vacuum draw on the crank case, at lower vacuum levels it opens further. Nothing to do with EGR.
 
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