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Old 06-26-2015, 09:17 PM   #161
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Also worth mentioning I run all the boost, so I can't afford to have detonation, thus why PCV is blocked off completely. I'd be more inclined to run it with a low to moderate boost setup that wasn't so prone to det.
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Old 06-26-2015, 09:26 PM   #162
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I have video proof of a good puff of smoke coming out of my exhaust side port on the dyno. Lemme find it.
<br />
<br />
<br />
<br />Around 20 sec.
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Old 06-26-2015, 09:31 PM   #163
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Quote:
Originally Posted by aidandj View Post
I have video proof of a good puff of smoke coming out of my exhaust side port on the dyno. Lemme find it.
<br />
<br />
<br />
<br />Around 20 sec.
Yeap, that's more or less normal. Rings don't seal perfect.
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Old 06-26-2015, 11:01 PM   #164
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True. But in practice, it's about 1/1000 (not even joking) the amount that a PCV system dumps.
You pretty much admit you've got blowbly and you know you're burning it, but you don't ever get the true benefit of a PCV system. I can see how it works, but I don't really see the point is all. You'd probably do better just venting it all out a charcoal canister or something.

Fuel filter or clear plastic tubing would be a good indication on what's up, I plan to predominantly use barb fittings, so it should be easy. I'll certainly report back with how it works once it's all done up.
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Old 06-27-2015, 02:07 AM   #165
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You pretty much admit you've got blowbly and you know you're burning it, but you don't ever get the true benefit of a PCV system. I can see how it works, but I don't really see the point is all. You'd probably do better just venting it all out a charcoal canister or something.

Fuel filter or clear plastic tubing would be a good indication on what's up, I plan to predominantly use barb fittings, so it should be easy. I'll certainly report back with how it works once it's all done up.
All motors have some blow by, no set of rings in the world seal 100%. My rings seal very well, but they aren't perfect. So yes, absolutely, there is some blowby. And yes I dump it into the intake as stock, since I don't want to smell it. You're right I don't get the benefits (and negatives) of a PCV system since I do not have it.

I wish you luck. I've messed with this crap for years, and the way I do it now works for me. There are some high HP miata that struggle with a good catch can solution running high boost and all that, I don't. So even if there's a better way to do it, and I know there is, my way is working for me.
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Old 06-27-2015, 03:18 AM   #166
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Old 06-27-2015, 09:49 AM   #167
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i have probably more hours into researching pcv and breathers than just about any other mt.net subject, and im not one bit closer to deciding how i should run mine. everybody has as a different opinion and things that work it seems, which leads me to believe its very case specific. :(
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Old 06-27-2015, 11:17 AM   #168
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i have probably more hours into researching pcv and breathers than just about any other mt.net subject, and im not one bit closer to deciding how i should run mine. everybody has as a different opinion and things that work it seems, which leads me to believe its very case specific. :(
What have you tested? What works for you? Or is your research just reading about what others did?

My fact is that what I run works. A few people have the opinion that it somehow doesn't work. What's funny is these people have oil soaked intakes..... And I don't. So all BS aside, if your crap works, then you're doing something right.

I can tell you if you run less than 28 PSI, and only drive on the street/drag strip/autocross on street tires, my setup works. And it's dirt simple. That's my experience, so I can't say anything outside of that. So maybe that's specific, but that's a case of what works that could fit a reasonable % of miatas.
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Old 06-27-2015, 11:26 AM   #169
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Your setup does jack **** other than control odor and is entirely pointless, doesn't do anything near what the people with soaked intakes want. You still burn oil vapor and blowby, it's just spread out through the intake, charge piping, idle valve, throttle body and supercharger instead of the intake alone. How yow you still can't adknoledge this is simply amazing. Just because you have results somewhat consistent with a good working system doesn't mean it works or that it's not about to explode. My car is a perfect example, I bet I can throw oil and water all over the road in ten minutes if I want in it's current state, still works fine 99% of the time though, no overheat.

So, that's it then. No more talk in my thread for a block vent as a substitution for PCV, thanks!
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Old 06-27-2015, 11:36 AM   #170
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LOL...

If my car is burning oil, will there be oil in the intake? Or SC inlet? Or charge pipes? Where should I look, I'll go take pictures for you if you like to "prove" who's right about this.

I hope you realize you asked for help so I posted what works for me. You don't have to get pissy about it man, relax! Hell I even said good luck, and post how the new setup works for you. Chill out man!
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Old 06-27-2015, 11:56 AM   #171
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Le'sigh...

Your car burns oil, this fact is indisputable. The crank case is not vented to the atmosphere at all, only the intake. We both know all cars have blowby, all cars make oil vapor when at running temp. Where does that go, where else could it go? Come back to me with a 180K motor and some real miles on that setup and we'll talk.

I never asked for help with deleting the PCV system, I made a long complicated post explaining my thought process behind my current plan for a setup better than what I use now. After, just 5 posts about how dumb I am for not doing "what works." Excuse me if I'm a bit touchy
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Old 06-27-2015, 12:07 PM   #172
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Yes, it does burn oil. That's a FACT. It's about 1/1000 of the amount it would burn if I had the PCV system installed. That's it. For me, this is perfectly acceptable. If I had the PCV hooked up, I bet it would take 3 catch cans in-a-row to reduce oil going into the crankcase to the level I have achieved with just one breather hose.

Still good luck, that jegs one looks like I might work ok and that's a good price if it does. I'm guessing the PCV side hooks to the middle part?
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Old 06-27-2015, 12:42 PM   #173
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Originally Posted by patsmx5 View Post
What have you tested? What works for you? Or is your research just reading about what others did?

My fact is that what I run works. A few people have the opinion that it somehow doesn't work. What's funny is these people have oil soaked intakes..... And I don't. So all BS aside, if your crap works, then you're doing something right.

I can tell you if you run less than 28 PSI, and only drive on the street/drag strip/autocross on street tires, my setup works. And it's dirt simple. That's my experience, so I can't say anything outside of that. So maybe that's specific, but that's a case of what works that could fit a reasonable % of miatas.

i havent tested anything. like i said im trying to decide what i should run based off researching this forum instead of wasting time and money trying to find what works.

the point of my post is that this forum is full of PCV threads that read like the last page of this build thread. and it leaves people like me holding a pcv valve in one hand and ***** in the other, standing in front of our cars with a confused look on our faces.

ive seen new thread after new thread started on this issue with people just trying to get to the bottom of it all, and they always just turn into another argument about what works with the occasional person coming in telling everyone else is over complicating it and its so easy. its ironic really.

i just want a ventilation system that works and that i never have to *** with.



sorry for restarting the **** deezums, i wont comment about this again in your thread.

pat- your more than welcome to answer me/discuss your ideas (opinions? facts?) in my build thread
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Old 06-27-2015, 01:18 PM   #174
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Originally Posted by patsmx5 View Post
Yes, it does burn oil. That's a FACT. It's about 1/1000 of the amount it would burn if I had the PCV system installed. That's it. For me, this is perfectly acceptable. If I had the PCV hooked up, I bet it would take 3 catch cans in-a-row to reduce oil going into the crankcase to the level I have achieved with just one breather hose.

Still good luck, that jegs one looks like I might work ok and that's a good price if it does. I'm guessing the PCV side hooks to the middle part?
Did you miss the amazon reviews that say the Jegs unit seems to be a rebranded air compressor filter, one guy says it even has sticker residue left from rebranding.

I'm not sure what you mean by middle part, but there's two ports on either side on top, drain on bottom, it should be directional. It goes in series somewhere between the pcv/valve cover and intake.


I'm a firm believer that you need some positive ventilation in the block if you haven't guessed by now

I am also exceptionally frustrated by the many, many hidden and buried posts of results of people's setups and how they worked. Lots of people post pics of what they've done, but not a lot of results photos.

A TL;DR of my thoughts on a proper PCV setup, you've seen what I've tested in this thread thus far. This info is as good as what you've paid for it...

Don't put scrubber in the valve cover, oil will hang on it instead of draining down as intended. Oil in the baffles is number 1 enemy, quickest way to fill an intake or catch can. Oil slows flow, means more oil gathers on reduced flow. Badbad, valve cover should be first simple catch can since it's already there.

For a can to work it needs to be huge and remotely mounted in a hopefully free flowing area so it's cool and can continue to condense vapor. That's hard, so instead try and use physics to knock the oil out. See Leafly or BMW PCV setups.

I'd rather a small, see thru, easily replaceable can. Shorter lines, higher flow, better chances of not huffing oil.

Oil will probably gather in the baffles, so increase the diameter of the baffle ports to increase flow. Consequently, you'll have less pressure in the block under boost which is cool for oil drains, dipsticks, and oil seals, maybe even head gasket oil returns.

Unless of course a piston is split, nagging at the back of my head still but there's noo way it could idle so smooth still. Can't be, better not be.
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Old 06-27-2015, 01:52 PM   #175
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Originally Posted by deezums View Post
Did you miss the amazon reviews that say the Jegs unit seems to be a rebranded air compressor filter, one guy says it even has sticker residue left from rebranding.

I'm not sure what you mean by middle part, but there's two ports on either side on top, drain on bottom, it should be directional. It goes in series somewhere between the pcv/valve cover and intake.


I'm a firm believer that you need some positive ventilation in the block if you haven't guessed by now

I am also exceptionally frustrated by the many, many hidden and buried posts of results of people's setups and how they worked. Lots of people post pics of what they've done, but not a lot of results photos.

A TL;DR of my thoughts on a proper PCV setup, you've seen what I've tested in this thread thus far. This info is as good as what you've paid for it...

Don't put scrubber in the valve cover, oil will hang on it instead of draining down as intended. Oil in the baffles is number 1 enemy, quickest way to fill an intake or catch can. Oil slows flow, means more oil gathers on reduced flow. Badbad, valve cover should be first simple catch can since it's already there.

For a can to work it needs to be huge and remotely mounted in a hopefully free flowing area so it's cool and can continue to condense vapor. That's hard, so instead try and use physics to knock the oil out. See Leafly or BMW PCV setups.

I'd rather a small, see thru, easily replaceable can. Shorter lines, higher flow, better chances of not huffing oil.

Oil will probably gather in the baffles, so increase the diameter of the baffle ports to increase flow. Consequently, you'll have less pressure in the block under boost which is cool for oil drains, dipsticks, and oil seals, maybe even head gasket oil returns.

Unless of course a piston is split, nagging at the back of my head still but there's noo way it could idle so smooth still. Can't be, better not be.
I didn't read the reviews, just looked at the pic. Yes it's a 10 dollar air filter compressor. I tried one a long time ago, wasn't impressed. But mine was a diff design than the one you posted, I bought a Kobalt one from Lowes. That one looks better than what I tried.

I've broke a piston in half, twice. I know what that is like. You'll be burning a metric TON of oil/smoke, and the car will shake at idle and run on 3 cylinders. You'll have a stream of smoke pouring out the oil cap when you remove it at idle. FWIW, once you hit about 20 PSI it will start running on that cylinder again. But be down on power....

Good luck, test some stuff and post how it works. That's how people learn, and that's what is great about forums. I agree it sucks when people don't follow up. It's usually because whatever they did didn't work, not everybody wants to say "I did this and it sucked, and broke my **** too. I was wrong".
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Old 06-27-2015, 01:58 PM   #176
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Also no matter what you do to the PCV, it shuts under boost and does nothing. It has a one way valve. So like, when in boost, it's like the PCV is gone and just the crankcase vent is being used.

So if you want less crankcase pressure in boost, you need to stop worrying about PCV and start messing with the crankcase vent on the exhaust side, as it's the only one active when in boost.
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Old 06-27-2015, 02:11 PM   #177
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Pay attention...

I've acknowledged that fact, some blowby out the breather is acceptable to me under boost. I see no benefit in burning that oil. (while in boost, no less) Street car, 99% of the time PCV is wide open and actively venting the block. I like the thought of sucking blowby out my motor.
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Old 06-27-2015, 02:18 PM   #178
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So you said you hate it when people aren't clear, don't post pics, etc. Can you post a diagram of what you want to run? I'm guessing you're gonna have a catch can on both sides so you're not burning any oil?
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Old 06-27-2015, 02:30 PM   #179
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I'll draw a picture later, but this is basically it.

There will be a pipe nipple in the intake manifold, the hose inline will have a check valve(PCV valve), next in the same hose is the compressor air filter which will hopefully keep oil from leaving the valve cover and entering the valve cover. After leaving the filter the hose goes to the valve cover, replacing the size limited stock push in PCV valve. The exhaust side port gets a breather filter, nothing more.

Unless under boost, air enters exhaust side valve cover breather filter, goes through the valve cover gathering junk, through the compressor air filter, and through the motor. In boost the filter/intake manifold is sealed off, so only what little blowby and heat expansion occurring in that brief period escapes the exhaust side breather and that's pretty much it.


Not to complicate things, you could go a step further...

You could ditch the breather filter, and plumb it back to the intake with no catch can. You'd burn blowby in boost then, which is bad.

If you put a catch can on the vent on the exhaust side of the valve cover, then plumed that hose right up next to the compressor inlet it would more than likely pull a slight vacuum on that hose, helping to vent blowby in boost if it were a problem, while avoiding burning blowby at the same time.

I don't see a need to complicate things that much. Some guys might have to, apparently some classes of SCCA SOLO require you either burn blowby or have 1qt catch cans vented to the atmosphere. I think I posted on that a page ago, further clarification says SSM is not a Modified class even though it's in the title.
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Old 06-27-2015, 02:47 PM   #180
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If you don't run a PCV valve that is purposely made very small, your gonna have hell with your idle and burn a ton of oil. The factory PCV valves are intentionally very restrictive, as it doesn't take much airflow to get all the benefit of the part, and more flow will result in more oil and less idle control.
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