cam cover blowby flow and crankcase pressure, tiny hole modification - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-30-2011, 08:57 PM   #41
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That fuel cell foam is too dense and will increase flow resistance way too much.
I tried something like that years ago.
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Old 02-01-2011, 02:50 PM   #42
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Interesting topic. Makes sense to some of my problems. I see VC mods in my future.

Just a note. The scrubber idea may not pan out well. Oil will wick up into whater you put in place. Think of the old oil bath air cleaners. Screen mesh with oil in a pan at the bottom. Hard turns in the path are most common way to drop oil out. also notice a small lip at the turn as well to "catch" the oil from streaming back into the airflow.
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Old 02-05-2011, 08:20 PM   #43
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I still wish one of you would try a different valve cover. I tapped the PCV port on my cover and used the factory one on the left rear passenger side. (square cover form escort or protege) I know this is the trouble area, but if the baffling is different, then maybe it is a solution. I just drained my contents, I had a very small amount of brown frothy/foam (I assume oil), and a budweiser color mixture that is currently separating. I assume water and fuel. Again, this is street driving only, but the collection has occurred during a lot of closed-loop boost tuning 19psi.

Someone humor me.
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Old 02-05-2011, 10:22 PM   #44
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Quote:
Originally Posted by djp0623 View Post
I still wish one of you would try a different valve cover. I tapped the PCV port on my cover and used the factory one on the left rear passenger side. (square cover form escort or protege) I know this is the trouble area, but if the baffling is different, then maybe it is a solution. I just drained my contents, I had a very small amount of brown frothy/foam (I assume oil), and a budweiser color mixture that is currently separating. I assume water and fuel. Again, this is street driving only, but the collection has occurred during a lot of closed-loop boost tuning 19psi.

Someone humor me.


??? What are you saying? That the escort/protoge cover is better? me no comprendo
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Old 02-05-2011, 10:27 PM   #45
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I can see the logic in that. The ports located at the rear are removed from the real oil sloshing action. Both of my ports are back there on the FE and I only see a small amount with the similar boosted tuning type runs.
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Old 02-06-2011, 12:15 PM   #46
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??? What are you saying? That the escort/protoge cover is better? me no comprendo
Based on what I am getting from my catch can and what others are getting in theirs during "street conditions", Yes, I think the square cover is better. I think it will greatly reduce the amount of blowby that people are seeing.

I want someone that runs on the track to confirm my hypothesis.

Frothy oil, I separated it by swirling it around in the glass.



I think this is pure fuel. Probably from idling so rich while the car warms up in winter. 11.5 AFR, but that's where it likes it. After warmup it idles at 14-14.5



I tried to ignite the mixture that I thought was gas (it didn't smell enough like gas, so I was curious). I think it might be coolant, which might suggest a small head gasket leak. I'll run some stop leak through the coolant to see if it makes a difference. I'm not in the mood to pull the head any time soon.

Last edited by miatauser884; 02-06-2011 at 12:49 PM.
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Old 02-13-2011, 06:36 PM   #47
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Just an update. Th fluid I was getting in my can was mainly coolant. I fixed this issue over the weekend.

I also did 70+ pulls from 0 to 18psi up to redline tuning closed loop boost. My catch can is empty.

Protege valve cover.
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Old 02-13-2011, 07:00 PM   #48
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Just an update. Th fluid I was getting in my can was mainly coolant. I fixed this issue over the weekend.

I also did 70+ pulls from 0 to 18psi up to redline tuning closed loop boost. My catch can is empty.

Protege valve cover.
How was coolant getting in your head?
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Old 02-13-2011, 07:40 PM   #49
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Not sure. Oil is free of water, so it had to be that the head gasket wasn't seated properly and a little coolant was getting directly into cylinder. I never had any white smoke out of the tail pipe, so it could not a have been much. Either that or the water passage in the throttle body was somehow compromised and letting coolant into the intake track. Then again, maybe it was just moisture condensing int he tubes going to the catch can. That actually makes a little more sense.

The initial fluid in my reservoir smelled somewhat like fuel, but it didn't separate into water and fuel, then, when I tried to ignite it nothing happened. I would expect fuel to burn.

I will leave my tried an true method for fixing the problem to myself so that I don't have to hear the "your stupid" comments. My catch can is empty. yay! Since my catch can, I am not having oil blow out my CAS seal.
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Old 04-18-2011, 06:49 PM   #50
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Originally Posted by Savington View Post
Jason, any updates? I am considering plugging both of the factory ports and drilling through the top of the valve cover on both sides in order to get the breather ports up as high as possible (and away from liquid oil).
Did you do any of this already?
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Old 11-16-2011, 02:37 AM   #51
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<3'in this thread.

im getting pics of my protege VC tonight. i will prob post them tomm.
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Old 11-16-2011, 02:15 PM   #52
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FWIW I'm running a 323 GTX VC with 10an bungs welded on the 2 ports on the valve cover, running to a VTA catch can. I didn't enlarge that hole either. I haven't had anything in the can yet, and I've checked it about 6 or 7 times. Been about 1000 miles now too.
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Old 11-16-2011, 03:02 PM   #53
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Here they are, this is all on the intake side (hence only the half circle cut on the other side for the na CAS)

The hole on the left is .255” dia, measured it last night with a mic.


Before disassembly:


After the plates are removed:



A close up:


Another close up:
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cam cover blowby flow and crankcase pressure, tiny hole modification-2011-11-15224155.jpg   cam cover blowby flow and crankcase pressure, tiny hole modification-2011-11-15224025.jpg   cam cover blowby flow and crankcase pressure, tiny hole modification-2011-11-15224110.jpg   cam cover blowby flow and crankcase pressure, tiny hole modification-2011-11-15224218.jpg  
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Old 11-16-2011, 03:04 PM   #54
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Quote:
Originally Posted by mighty mouse View Post
FWIW I'm running a 323 GTX VC with 10an bungs welded on the 2 ports on the valve cover, running to a VTA catch can. I didn't enlarge that hole either. I haven't had anything in the can yet, and I've checked it about 6 or 7 times. Been about 1000 miles now too.
That’s good to hear, im assuming I wont have a problem with my protégé one then either. The only difference I can tell just by a google search is that the 323 gtx ones have a little nipple or barb sticking out for what I assume is to go to the intake mani. Mines just a hole (see above post)
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Old 11-16-2011, 04:04 PM   #55
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I did this mod too.

I reamed the ever livign **** out of the tiny hole and made it as big as ******* possible.

Then I put two -12 bungs on VC and routed them to my slashcut in exhaust. Catchcan is for the lame.

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Old 11-16-2011, 04:10 PM   #56
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Originally Posted by blindboxx2334 View Post
That’s good to hear, im assuming I wont have a problem with my protégé one then either. The only difference I can tell just by a google search is that the 323 gtx ones have a little nipple or barb sticking out for what I assume is to go to the intake mani. Mines just a hole (see above post)
that nipple is just pressed in there, so I just clamped some vice grips to it and worked it out.
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Old 11-16-2011, 05:01 PM   #57
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Originally Posted by mighty mouse View Post
that nipple is just pressed in there, so I just clamped some vice grips to it and worked it out.
oh good deal. im not going to do anything with it anyways, with all the chambers and **** going on up there, i highly doubt oil would even come close to that little hole.


oh and i posted a ? on your CR build thread.. whenever you have free time. no biggie.
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Old 11-16-2011, 05:08 PM   #58
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Originally Posted by Faeflora View Post
I reamed the ever livign **** out of the tiny hole and made it as big as ******* possible.
im going to try and ream mine. i dont have much more room to do so, but mighty mouse isnt having a problem with his 323 gtx VC so i doubt i need to even do anything, but i will sleep sounder at night with it enlarged.
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Old 08-22-2014, 02:00 AM   #59
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Thread Necro.

I just wanted to add my information here as it's similar in issue.

I've been running a good amount of boost through the stock MSM PCV system. I have been having massive issues with what I thought was rear main seals going bad. I've changed them out 2 times in the past 6 months.

Then I plugged a boost gauge in a spare oil fil cap and realized I was running 3psi of "boost" in my crank case.

Following Jason's lead, this is what I did.


.400" drill size then cleaned up with carbide bit.


I actually made a small second hole to add just a little more flow. I'd rather deal w/oil in the catch can than oil blowing out my rear main seal and making a big *** mess in my bell housing and everything underneath and behind it.


Pulled stock fitting out with twist, pull, hammer.


Drilled larger for 1/2" fitting that I'm going to JB weld in tomorrow.

I'll make a new thread or update this one with what I find.
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cam cover blowby flow and crankcase pressure, tiny hole modification-20140821_174518_hdr.jpg   cam cover blowby flow and crankcase pressure, tiny hole modification-20140821_181151.jpg  
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Old 08-22-2014, 02:38 AM   #60
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did this and ran into a improperly sealed baffle cover. looked like serious oil issues. resealed and all was good again
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