ryansmoneypit

iTrader: (6)

A. How would air escape the only air inlet (besides blowby) ?
B. how is this different than using a stock PCV system, in terms of oily air entering the combustion chamber?

The turbo draws an insane amount of vacuum with the venturri

Real questions.

Ryan_G

iTrader: (8)

B. It's not any different than using a stock PCV system. Sixshooter would never suggest you use a PVC system or anything like it. He vents his catch can to atmosphere.

aidandj

iTrader: (5)

Blowby. All engines have some. Ideally you want to be pulling a vacuum on your crankcase. I would skip the fresh air inlet.

Art

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sixshooter

iTrader: (12)

All engines have blow by. Engines have more Blow by as you increase cylinder pressure due to boost. The suction you are betting on having is only related to how much blockage there is in your air filter element. For a turbocharged engine it is highly desirable that you have nearly zero blockage due to an air filter element. There may be a bit of a draft and Bernoulli's principle might apply but only in very high Inlet velocities. As it is drawn, your suction hole will be a path of low resistance and the likely exit for a lot of blow by.

ryansmoneypit

iTrader: (6)

you need to get up to speed on the miata valve cover. the passenger side is total ****.



I guess Im going to have to measure how much vacuum this thing makes, as well as the volume it pulls. Although I full understand what you guys are saying, Its all a bunch of guessing without knowing how much air I can actually eveacuate through the intake. Science, coming soon.





All pictures pre final assembly. Everything was deburred and polished.

Art

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ryansmoneypit

iTrader: (6)

Because the word "proper" has yet to be determined. Shitloads of "this works ok" and " here is what I did."

sixshooter

iTrader: (12)

My **** works well, is high volume, and doesn't end up with any oil into catch can.

No you can't see it.

Ryan_G has seen it and is doing something similar. It isn't actually difficult. Just a bunch of science and ****.

sixshooter

iTrader: (12)

Since I've been drinking and I'm in a very generous mood I will give you some Clues. Trying to cram the blow by created by 300 horsepower through a set of little bitty ports and lines designed for the blow by of 100 horsepower through the same displacement engine creates a shitload of pressure differential and therefore velocity through those little bitty ports. High velocity tends to carry liquids suspended in gases much more easily than low velocity created by the larger passages and hoses. If you double the horsepower then double the breather tube capacity. If you triple the horsepower ******* triple the breather tube capacity. This includes the little bitty *** ports inside the valve cover. Open those bitches up and let them breathe. If you slow down the velocity of the vapor then the oil will settle out of the stream.

And please don't feed that vapor to your engine. It's not tasty.

Art

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ryansmoneypit

iTrader: (6)

Six,
You offered little to zero new information in that mini rant..

you need to open up the ports on the valve cover- no ****
oil particles carry better in high velocity- yes we know that
300 hp makes a lot of blow-by- yerp, got that one too

I thought most of us agreed that 1/2" (-10) lines were the new normal. I definitely see why the intake is a poor source of vacuum, because oily air. How much does tiny bit of oil affect things? no idea. Impossible to answer. too many variable. So using the intake is off the table for now. I really dont want to smell fumes. Its not a daily but I still cant stand oil fumes, and a bunch of VTA points sounds like a stinky solve. Now Im back to thinking about dumping stinky air back into my exhaust.


How about some pictures of what you have come up with, you drunk dick.

BogusSVO

iTrader: (1)

I have skimmed over this here n there.

Hate to cross link, but this may help some of you.

The 4G63T PCV System | DSMtuners

ryansmoneypit

iTrader: (6)

Nice find Bogus. It seems to agree with my first / current set up. I guess according to this guy, it fine. Whoever the hell this dude is.

kero

So what exactly is the concensus on valve cover modifications when running 20ish psi of boost? I am seeing some excess crankcase pressure that is causing turbo to leak oil past the piston seal. Currently have pcv valve hooked up to catch can and catch can to intake mani. Driver side hole has a little breather filter.

adryargument

iTrader: (1)

fwiw i had so much blowby that a simple trip to the shops was 500ml of oil out the top of the valve cover.
i ended up drilling the sump and running a new line to catchcan....

I dont know if i spurt oil anymore, maybe the crankcase pressure simply bypasses the valvecover and goes straight to catch can.

Note": engines in the shop getting honed. New rings and bearings otw.

Ryan_G

iTrader: (8)

Are you running an efr? How big is your drain line?

psyber_0ptix

iTrader: (4)

oil

BogusSVO

iTrader: (1)

Calan is a guy who has been building catch cans for years, and has done some long term studying on the topic.

With How similar the Mazda BP is to the Mits 4G63, I figured most of the info would carry over.

sixshooter

iTrader: (12)

Lol