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Old 07-17-2013, 02:27 AM   #1
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Default Baffled by my Baffling (Valve Cover)

I am going to run a crank evac on Phase 1 of my new setup. The crank evac will be similar to this:
http://www.summitracing.com/parts/vpe-1189
and it will have a -10AN Male fitting to attach to. I want to run a -10AN brainded line to my valve cover breather which will be drilled out and threaded to accept a 3/8" NPT to -10AN adapter.
Debates: I most likely will not be running a check valve as I cannot find a check valve with a -10AN fitting on it.
Debate#2: Is the breather port acceptable to use for this? I.E., is the baffling sufficient?
The PCV side looks better as far as possibly having larger area to pull better vacuum, but the breather side looks "more restrictive" as far as keeping oil out of my exhaust.
Here's what the valve cover looks like with the baffle plates installed:
Baffled by my Baffling (Valve Cover)-baffle.jpg
Here's what it looks like with them removed:
Baffled by my Baffling (Valve Cover)-baffle2.jpg
This is the breather side, note the tiny hole that transfers to the center of the valve cover:
Baffled by my Baffling (Valve Cover)-breather.jpg
This is the much larger, but more baffled area coming in from the PCV:
Baffled by my Baffling (Valve Cover)-pcv.jpg
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Old 07-17-2013, 08:14 AM   #2
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and this is a thread, on the exact same subject:

https://www.miataturbo.net/engine-pe...-thread-46833/
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Old 07-17-2013, 10:48 AM   #3
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gawd damn noobs
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Old 07-17-2013, 10:59 AM   #4
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Crap.
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Old 07-17-2013, 11:04 AM   #5
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I'm sure you can find an industrial JIC check valve. Remember JIC and AN thread into each other and seal 99.9995% of the time.
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Old 07-17-2013, 11:15 AM   #6
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True. Is a check valve really necessary though?? I just don't see how anything other than vacuum would happen due to the angle of the tube welded in the DP.
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Old 07-17-2013, 11:43 AM   #7
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slashcuts suck
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Old 07-17-2013, 11:49 AM   #8
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Quote:
Originally Posted by thirdgen View Post
True. Is a check valve really necessary though?? I just don't see how anything other than vacuum would happen due to the angle of the tube welded in the DP.
If your back pressure is too high from a restrictive exhaust it can. And I've been reading about it on and off today, it seems on some cars they only make vac when in boost.

Also, if you keep the stock pcv valve and dont put a check valve in the exhaust slashcut you'll suck exhaust through the engine and into the intake manifold at idle and low load.

Last edited by Leafy; 07-17-2013 at 12:49 PM.
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Old 07-17-2013, 01:44 PM   #9
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Quote:
Originally Posted by Leafy View Post
If your back pressure is too high from a restrictive exhaust it can. And I've been reading about it on and off today, it seems on some cars they only make vac when in boost.

Also, if you keep the stock pcv valve and dont put a check valve in the exhaust slashcut you'll suck exhaust through the engine and into the intake manifold at idle and low load.
My exhaust is 2 1/2" from turbine outlet to muffler, no cats, no resonator...just a muffler. I don't think it's restrictive...or is it?

I'm planning on plugging the PCV port and using the breather port to connect my crank evac to.

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slashcuts suck
Why do you say this?
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Old 07-17-2013, 02:49 PM   #10
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Quote:
Originally Posted by thirdgen View Post
Why do you say this?
Glad you ask



Faeflora has a pair of slashcuts and from my experience they are awful. Main reasons being
- hoses running to your downpipe. downpipe removal becomes a massive, massive pain in the ***
- oily rear bumper due to all the crap burning
- can't really measure how well its working (with a catchcan you can check the contents)
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Old 07-17-2013, 02:55 PM   #11
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Quote:
Originally Posted by soviet View Post
Glad you ask



Faeflora has a pair of slashcuts and from my experience they are awful. Main reasons being
- hoses running to your downpipe. downpipe removal becomes a massive, massive pain in the ***
- oily rear bumper due to all the crap burning
- can't really measure how well its working (with a catchcan you can check the contents)
1. Use a good connection like an AN, and don't place it like an idiot.

2. Rear bumper shouldnt be oilly unless you have a blow by issue or a stupidly placed exhaust exit.

3. Sure you can, pull out your dip stick and put a rubber line over the tube and either run that to another map sensor you can log or a boost/vac gauge. If you're making vac in the crank case during boost, its working.

Or you could just put a catch can on the line if you felt like it.
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Old 07-17-2013, 03:18 PM   #12
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Quote:
Originally Posted by Leafy View Post
Or you could just put a catch can on the line if you felt like it.
That actually might be the best idea ever. I could just use a slashcut as a vacuum source on my existing catchcan. That way it will, theoretically, also work while cruising.
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Old 07-17-2013, 06:04 PM   #13
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I think FaeFlora used hose clamps and ****. I'm using AN fittings. No leaks for me.
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Old 07-27-2013, 04:18 PM   #14
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Quote:
Originally Posted by soviet View Post
That actually might be the best idea ever. I could just use a slashcut as a vacuum source on my existing catchcan. That way it will, theoretically, also work while cruising.
Isn't this similar to bbundys setup as he described it in the catch can thread? Can drains to oil pan and slashcut with check valve pulls out air?
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Old 07-27-2013, 07:04 PM   #15
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What's wrong with plugging the intake side and running a catch-can on the exhaust side?
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Old 07-30-2013, 07:09 PM   #16
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It is not just about oil control, "MORE POWER" can be had
Moroso Vacuum Pump Test - Car Craft Magazine

I have been thinking about the best way to achieve this.
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Old 07-30-2013, 08:13 PM   #17
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Anything has done to his poor miata, should not be forced upon any other miata. In fact, measures should be instilled to make sure the exact opposite happens.
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Old 08-02-2013, 02:50 PM   #18
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Wait......some people are just learning that pulling vacuum on the crankcase will make more power? I thought this was common sense....with the exception of all the fucksticks out there with breather filters on their valvecovers or breather filters on a catch can. Those people are retarded.
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Old 08-02-2013, 03:05 PM   #19
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Quote:
Originally Posted by Doppelgänger View Post
Wait......some people are just learning that pulling vacuum on the crankcase will make more power? I thought this was common sense....with the exception of all the fucksticks out there with breather filters on their valvecovers or breather filters on a catch can. Those people are retarded.

'Sup?

Currently topped with 3 Moroso breather filter. <3





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Old 08-02-2013, 03:13 PM   #20
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Quote:
Originally Posted by Doppelgänger View Post
Wait......some people are just learning that pulling vacuum on the crankcase will make more power? I thought this was common sense....with the exception of all the fucksticks out there with breather filters on their valvecovers or breather filters on a catch can. Those people are retarded.
I like the smell of blowby when I'm doing a pull.
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