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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 05-16-2007, 11:21 PM   #1
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Default I am one lucky SOB! You're not gonna believe this!

All right, this is too good not to start a new thread... continued from here: https://www.miataturbo.net/forums/showthread.php?t=9904

I started to diagnose my smoking problem and follow some advice I'd just posted in another thread... so I bought a 323GTX PVC valve on my way home just to rule it out as a cause and found this when I pulled out my stock PVC valve:

So, I assumed that's not what it's supposed to look like and wondered where the guts were... yup... you guessed it:


How ******* lucky am I? I am about 2mm from needing a new engine. Check out where the PVC plunger hit the camshaft and scored it:

So what was happening was that I was putting 12psi directly into the valve cover and then down in to the crankcase, up the oil drain and into the CHRA, preventing oil from draining and BLOWING MY TURBINE SEAL! So I guess that's why I just started smoking. I'm not sure if I caught it in time. I can't drive it tonight cause I'm waiting for the RTV on the valve cover to dry. We'll see tomorrow if it's salvagable.

I also did a compression check. 187/190/191/193... I guess that's pretty good. My valvetrain also looks like brand new. I love this motor.
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I am one lucky SOB!  You're not gonna believe this!-dsc03324-small-.jpg   I am one lucky SOB!  You're not gonna believe this!-dsc03328-small-.jpg   I am one lucky SOB!  You're not gonna believe this!-dsc03329-small-.jpg   I am one lucky SOB!  You're not gonna believe this!-dsc03332-small-.jpg   I am one lucky SOB!  You're not gonna believe this!-dsc03327-small-.jpg  


Last edited by samnavy; 09-01-2007 at 12:33 AM.
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Old 05-16-2007, 11:29 PM   #2
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Very Lucky! Do you remember what the original valve was? OEM Miata?
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Old 05-16-2007, 11:33 PM   #3
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Good catch navy. This should be part of a PCV sticky because it seems everyone goes through it till they replace the valve.
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Old 05-16-2007, 11:47 PM   #4
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I didn't boost my car til I had the proper PCV. It's not a pricey part.
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Old 05-17-2007, 01:12 AM   #5
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wow, never seen that happen before
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Old 05-17-2007, 01:22 AM   #6
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Pretty Hands!
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Old 05-17-2007, 01:24 AM   #7
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Wow. Nice save.
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Old 05-17-2007, 01:26 AM   #8
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Quote:
Originally Posted by LOLA - 92 View Post
Pretty Hands!
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Old 05-17-2007, 01:50 AM   #9
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You can get inline universal PCV valves (just a one-way check valve) and then use a fitting on the valve cover. Might be some nice insurance if these things come apart very often. Kind of a scary thought.
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Old 05-17-2007, 02:46 AM   #10
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It will be fine wit the 323 gtx pcv. It is actually made and intended for boost, unlike the stock miata one. It's usually cheaper too
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Old 05-17-2007, 02:46 AM   #11
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Wow, we didn't need another dead engine post. Good thing it landed where it did! What are you replacing it with? The stock 323gtx one? If so I'm gonna go run out and get one....
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Old 05-17-2007, 02:49 AM   #12
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great find and god damn you got lucky. Hope the car runs well man update us once you fire her up.
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Old 05-17-2007, 09:43 AM   #13
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That's insane....Sam, I turst the turbo is ok now. You've rebuild one, the seals aren't really seals....there's nothing to "blow," thing just got overloaded and now everything should be ok.

holy crap on the pcv....i was actually spending most of the night last night looking for a better solution than the gtx valve....if anything get a factory Mazda piece....but I was considering "gutting" my OEM pcv, and putting this brass check valve inline: http://store.summitracing.com/partde...5&autoview=sku

another thought....behind the pcv valve should be a screen and compartment bolted to the cover from preventing "things" to enter....how the hell did it get past that?!
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Old 05-17-2007, 10:11 AM   #14
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what is a pcv ? ?
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Old 05-17-2007, 10:16 AM   #15
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postive crankcase ventilation
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Old 05-17-2007, 10:22 AM   #16
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is that the hose running from the top of the head, to the intake piping? the oil blow off thing ?
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Old 05-17-2007, 10:25 AM   #17
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otherside, intake manifold to crankcase.
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Old 05-17-2007, 10:32 AM   #18
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ah ok. so, i'm supposed to upgrade this part?? never heard of that before ?!?
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Old 05-17-2007, 10:41 AM   #19
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they weren't intended for boost from the factory....but technically they are just a check valve so should be fine....but too much postive pressure can still force somehow force it's way past the plunger into the crankcase....

this will either:
A. dump LOTS of oil into your intake
B. dump LOTS of oil up back into the turbo.
C. shoot your dipstick out and dump LOTS of oil up the tube.
D. damage rings, valves, etc.
D. combination of A,B,C & D

Most people here upgrade to a 323 GTX PCV valve as it was our same engine boosted 7psi from the factory...The tend not to leak under boost...
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Old 05-17-2007, 10:44 AM   #20
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CRAP!!! HOW DID I MISS GOING OVER 1000 POSTS???

^Well, I'm not sure how long this thing has been broke. My last turbo started to smoke and I thought it was bad, but I was running it well past 10psi and after a couple weeks it started to smoke. Maybe it's been broke for a long time.
On the other hand, I'm pretty sure I've had the PCV valve out in my hands a time or two since then. Every time I pull the fuel rail, that little hose comes off. I'm not really sure how long it's been broken.

Here's pic of the thing with the valve cover on:

Last edited by samnavy; 08-01-2007 at 10:52 PM.
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