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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 12-06-2007, 02:36 PM   #41
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Doesnt look our valve cover, that valve cover has the oil cap on the wrong side when compared to Levnubhins engine.

But I guess I see what you mean. More baffles on the PCV side then the breather side.
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Old 12-06-2007, 02:41 PM   #42
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yeah i found that pic online, looks off....i remember looking at it first hand when i did my first pcv valve when i was like 15yo or something....i lost part of the gasket inside the cover...i had to remove the valve cover form the head and then remove the plates to get the rest of the rubber out.

I really never worried about a catch can, even when my rings were bad and i got the oil in my intake you can see above....if you watch this dyno run....you can see the burn-off on decel, didn't bother me none:



The rings were so bad on that engine, a catch can would actually cause Spyhunter smoke in boost as the pressure drop of the can was enough to prevent any venting to be done.

I think the honda approach, pcv line (with no pcv) and breather line connected with large line, to a single can with a large vent is the best approach to venting and catching oil.
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Old 12-06-2007, 03:04 PM   #43
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Quote:
Originally Posted by Saml01 View Post
Doesnt look our valve cover, that valve cover has the oil cap on the wrong side when compared to Levnubhins engine.
Fixed. Now it's a proper 1.8 valve cover:



Upon further reflection, I think this is actually how the picture was supposed to be originally. Note the correct orientation of the fusebox and washer bottle in the right side of the photo now that I've reversed it.
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Old 12-06-2007, 04:15 PM   #44
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I run a breather on the exhaust side, and a PCV to the intake, and still get oil in my intake. a DIY catch can is on the list of projects between the intake mani and valve cover.
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Old 12-06-2007, 08:42 PM   #45
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http://www.dragstuff.com/techarticles/vacuum-pumps.html

Thats about a real pump setup, it provides a better ring seal.
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Old 12-07-2007, 07:13 AM   #46
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I've tested both lines on m y SC'd engine, and the PCV side flows significantly more oil mist in the catch can than the breather (hot) side. I use inline fuel filters to monitor the oil mist that escapes the catch cans to see if they're working. May have something to do with the amount of time not in/in boost since the PCV will be either open or closed. I am pretty conservative on the street.
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Old 12-07-2007, 09:16 AM   #47
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I welded bungs on my intercooler's end-tanks and have both ports on the cam cover plumbed directly to that.

Never had any problems! Werx gr8!!
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Old 12-07-2007, 09:22 AM   #48
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Do you have any sort of catch in that line b4 the intercooler?
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Old 12-07-2007, 09:32 AM   #49
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Quote:
Originally Posted by Brian View Post
I welded bungs on my intercooler's end-tanks and have both ports on the cam cover plumbed directly to that.

Never had any problems! Werx gr8!!
please tell me this is a joke. turbo is suppose to boost combustion chamber... not the crankcase.
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Old 12-07-2007, 09:35 AM   #50
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I was thinkin the same thing, wouldnt you be forcing air back thru those lines back into the crankcase?
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Old 12-07-2007, 09:45 AM   #51
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come on guys....Brian is the biggest "correct plumbing of the pcv" advocate.
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Old 12-07-2007, 10:37 AM   #52
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Quote:
Originally Posted by soflarick View Post
I've tested both lines on m y SC'd engine, and the PCV side flows significantly more oil mist in the catch can than the breather (hot) side. I use inline fuel filters to monitor the oil mist that escapes the catch cans to see if they're working. May have something to do with the amount of time not in/in boost since the PCV will be either open or closed. I am pretty conservative on the street.
Hold on you are confusing me.

I thought the PCV side was the one on the hotside(the one with a PCV Valve) and the breather was on the cold side.
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Old 12-07-2007, 10:50 AM   #53
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the pcv line plumbs into the intake manifold iirc? the breather is hooked up to the intake pre-turbo right?
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Old 12-07-2007, 10:54 AM   #54
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Sam, the PCV goes intake side, so cold, even though they are both hot, lol
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Old 12-07-2007, 10:55 AM   #55
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PCV is connected between the crankcase and IM.

Breather goes straight to the intake.


The reason i put the catch can on the breather side, is because in boost, when blow-by is accelerated, you have a constant vacuum source (1-2~hg.) hook up to the intake. As pressures build up and some boost leaks through the PCV valve itself, it exits the breather line to be recirculated back into the IM.

Since the pcv is technically closed at idle and boost, I don't see that side being much of a deal, and any fumes/spray that gets past the baffle and the valve itself during cruise is easily mixed in the airflow and burns off without issue.

I still propose, since the pcv valve itself is for emissions, the best solution is this:

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Old 12-07-2007, 10:59 AM   #56
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So you would just put a cap where the pcv would normally be on the intake manifold?
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Old 12-07-2007, 11:06 AM   #57
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Quote:
Originally Posted by levnubhin View Post
So you would just put a cap where the pcv would normally be on the intake manifold?
Yup.

The picture above is how myself and friends run our turbo hondas. It is also how I have my miata set up. The only tweak is I'm trying to find a cheap vacuum pump to install and pull vacuum routed through the catch can (with no filter, just media inside to catch oil mist).
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Old 12-07-2007, 11:08 AM   #58
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Did you also eliminate the pcv or is still hooked up?
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Old 12-07-2007, 11:12 AM   #59
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pull it if you can, but then you'd gotta drill and tap the valve cover for a bung, easier to drill out out and remove the guts and port it.

updated pic.


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Old 12-07-2007, 11:25 AM   #60
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Quote:
Originally Posted by Braineack View Post
come on guys....Brian is the biggest "correct plumbing of the pcv" advocate.
EVAR!!!!

Ahhh, I miss those days...
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