crank case pressure question

Discuss topics related to the CA18DE and CA18DET series engines.
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float_6969
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Sean is right, if you use setup #2 you eliminate the PCV which as I said, will cause problems when off boost. But I think I just figured out how to make it work, correctly, w/o 2 catch cans, gimmie a couple min. and I'll post it up...


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float_6969
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Let me know if this doesn't make sense. I've gone over it about 12 times and I think this will work....

niscort
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yep... that works fine as the crankcase is in vacuum both on boost and off boost. Only thing is that it elimates the fresh air flush that the standard system uses during the off boost cycle.

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somehow I cant see the pic... when I click on it it saysFile attachments can only be linked from the message board server; Outside linking is not allowed.

Your referrer: http://www.nissaninfiniticlub....age=2


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CA19DET
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mee too, this new forum software suck

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Sorry for bumping, but i've done it another way kinda.

I did number too, but i didn't but it back into the system.. my catch can doesn't plumback, so it just filters.. heres a pic.

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float_6969
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There is a possible problem with that system. It's due to the fact that since no negative pressure is ever applied to the crankcase, many of the corrosive gasses will never be relieved from the crankcase, possibly causing damage.

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float_6969 wrote:There is a possible problem with that system. It's due to the fact that since no negative pressure is ever applied to the crankcase, many of the corrosive gasses will never be relieved from the crankcase, possibly causing damage.
So should i plumb it back into the intake side, or actually into the intake manifold ?

This is how i have seen most setups here on other cars.

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float_6969
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I would run it back into the intake w/a PCV valve.

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you eliminated the pcv valve man... I would run a hose from the exhaust side valve cover hole to the catch can. Then another from the rubber turbo inlet hole to the catch can. I would leave the intake stock breather hoses alone. My .02 not sure if thats correct.

Sean

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R
NeedCAforS13 wrote:
Remeber, that will only work on boost...

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NeedCAforS13 wrote:
I was gunna use that spare hole where it plumbs back in for bov return.

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float_6969
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I don't think that opening is nearly big enough for a BOV return...

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float_6969 wrote:I don't think that opening is nearly big enough for a BOV return...
It is for my ARC bov.. 16mm OD of the bov and that valve on just after the sensor is to.. measured with verneers

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Well I'll be darned! Good to know. I'm going to have to have a custom suction pipe for the turbo made. It's actually going to be a CAI. I'm hoping it will drastically lower my intake temperatures. Currently it's just pulling straight out of the front of the turbo. No attachements whatsoever.

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float_6969 wrote:Well I'll be darned! Good to know. I'm going to have to have a custom suction pipe for the turbo made. It's actually going to be a CAI. I'm hoping it will drastically lower my intake temperatures. Currently it's just pulling straight out of the front of the turbo. No attachements whatsoever.
Yeah, i thought about making a cai, but i made a box for my pod filter for now, which seems to be working pretty good. Its all aliminium, and like 4-5mm lol, all that i could find !! but you can notice the difference when you put your hand on either side of the panel, it's pretty awesome.. In this photo you can see the box, but now on the side that facing us, i mounted my catch can there, just cause it was the only spare spot in my bay

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rexhunta wrote:Sorry for bumping, but i've done it another way kinda.

I did number too, but i didn't but it back into the system.. my catch can doesn't plumback, so it just filters.. heres a pic.
I like this! This thread has been dead for a year, but rexhunta dug-in and found what he was looking for; and to top it all off, you guys have gotten better with your drawings, even adding color. You guys are awesome .,

Dee

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float_6969
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I found this for him Dee. He's not THAT cool! JK, Rexhunta, I gotta give you trouble.

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:lol: i deserve it. yeah Float found it for me, couldn't find what i was looking for. Big ups tohim. thanks !@

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This is how my CA clip came,yes dont laugh at the garden hoses,lol....this is the way Im still running it since I never had the stock tubing. So any decissions on the ideal setup for a street car?

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Sorry to resurect an old thread from the depth again...but I dont see that any conclusion was arrived at with this..I found this pic with an interesting setup..looks like 2 T fittings. Doesnt have a a can but its the connections im interested in. Click the link. just in cas you need to log inuser name nico2006 pw=aksk3tec

http://www.tomweise.de/Bilder/sxe2.jpg

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If you guys are wondering what I do, I kinda use method #1 on the intake side being that I do use the stock hose and PCV valve, but on the exhaust side, it's free of anything. I don't care to recirculate crankcase gases. Also, it's the one of the methods I use to gauge the engine's ring condition.

Constantly spitting-up at 15psi and below, you need new rings.

No spitting-up of oil at 15psi and below, you have what appears to be healthy rings and pistons.

Spitting-up of oil at 20psi, but not in moderations, is somewhat normal, but one should monitor conditions because really healthy ca's that I've built or used did not spit-up anything.

Spitting-up oil past 20psi is acceptable.

Not spitting-up oil after 20-25psi, priceless.

Without the PCV valve, you're asking for issues. Either one of float methods will be good if the situation pertains to your application. Good luck!

Dee

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So did anyone figure out what was up with the dip stick? Mine has shot out only like an inch but it was enough for me to lose a quart of oil. It sucked cause I just cleaned the engine bay the day before. It's done that twice so far and only seems to happen when when I'm high in the rpms. I noticed the rubber stopper thingy isn't the best for a secure fit either(it kinda just sits in there) I've thought about ziptying it down but does anyone have another idea. I don't have blowby or atleast not now after I switched my catch can to the garden hose setup. I had needcafors13 setup but I filled the catch can after two runs at high rpm. Here is a pic of what I have now. It's hard to see but the catch can is on the passenger side firewall.

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You can always semi-crimp the dipstick tube to accomodate the worn rubber gasket on the dipstick.

Dee

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Here is another one that I thought of. I could see this one causing problems with a MAFS system though. Since I'm using SDS, I'm pretty sure this is the method that I'll be using now.

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my idea for catch can...........

how does this work?



Ps I dont have a valve to route back on my intake or I would do it that way

niscort
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does it work? no.

blow by occurs when in boost, same time your pcv closes. meaning you have a closed circuit. bye bye oil stick, hello possible fire.

image at top of this page by "NeedCAforS13" is the one you want.

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this thread started in 2004... why did it surface?

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because gabby had an idea. pfft


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