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Tappng the intake for PCV valve

 
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projekt70chevelle
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Location: Sanford
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PostPosted: Sat Sep 15, 2018 3:55 pm    Post subject: Tappng the intake for PCV valve Reply with quote

Hello.

So my setup is a 400sbc .040, large cam duration, running an air gap open plenum with a demon which only has the one vacuum port dedicated currently to my brake booster. (i am not going to run a Tee)

I would like to run a proper PCV setup and have a good idea on how I plan to do it with the exception of having a port to attach to...

I was considering the "crankcase extraction kits" but I have baffled mufflers.

With all that said, Im coming to you guys for some guidance/reassurance so that I am not missing something obvious.

1. Is it ok to tap the intake? I've read guys running spacers just to use one port. I'd personally rather tap directly to the manifold.
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Big Dave
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PostPosted: Sun Sep 16, 2018 12:23 am    Post subject: Reply with quote

Depending upon the carb you have you may have a large tube already plugged that you uncapped and ran a PCV hose to it. Failing in that hole could be drilled through the top of a rear intake manifold runner and a 3/8 NPT tap used to accept an elbow to run the hose to it.

Big Dave
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af2
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1933 Willys Coupe

PostPosted: Tue Sep 18, 2018 3:21 pm    Post subject: Reply with quote

Tap into the plenum not a runner or you will have oil in that cylinder.
Nothing wrong with a T
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Tue Sep 18, 2018 3:34 pm    Post subject: Reply with quote

Surprised that the manifold doesn't have a plugged 3/8 NPT port on it. Most of them have one behind the carb on the plenum. A "T" will work. PCVs stay more or less plugged at high vacuum and you have a check valve on the brake booster to store high vacuum. Should be fine with that. Up to you of course.
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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projekt70chevelle
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PostPosted: Thu Oct 25, 2018 11:26 pm    Post subject: Reply with quote

Well I have been deliberating this and I just want to go with the most efficent/cost effective way of dealing with the exhaust gases.

I am going to most likely drill and tap the intake just for my own piece of mind, but my dilemma is what setup is best?

My current valve covers are non baffled so im thinking i need to start there by getting some baffled covers. Rolling Eyes Laughing

Would a oil catch can be more effective for getting more pressure out or would it consume too much oil without a pcv? should I run both inline with each other?

Either way I would love to rid myself of blowing seals prematurely.

Thanks so much for chiming in before!
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri Oct 26, 2018 10:28 am    Post subject: Reply with quote

I take it non-baffled valve covers are just sheet metal with a gromet in them? I know the old MT valve covers I used to have that were cast aluminum had a couple screw holes in them to place a baffle underneath the PCV.

In the case that it is unbaffled and just sheet metal with a gromet you would have to do something about all the oil you may suck into the PCV. A catch can would certainly help. Just a lot of stuff under to the hood to get a simple PCV working.

Baffled covers are a better way to go.

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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projekt70chevelle
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PostPosted: Fri Oct 26, 2018 11:55 pm    Post subject: Reply with quote

the valve covers i have are a tall cast aluminum that the previous used and drilled out the breather holes extra large, new covers will be on their way shortly.
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af2
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1933 Willys Coupe

PostPosted: Thu Nov 01, 2018 11:45 pm    Post subject: Reply with quote

projekt70chevelle wrote:
the valve covers i have are a tall cast aluminum that the previous used and drilled out the breather holes extra large, new covers will be on their way shortly.


Thread the holes first before you install the baffles. Trust me on this one!!
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri Nov 02, 2018 9:18 am    Post subject: Reply with quote

Adam, I think he is talking about the breather hole for the gromet which is over size making the covers junk not the threaded baffle holding tapped holes. LOL Laughing
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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af2
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Joined: 01 Sep 2003
Posts: 5564
Location: grassvalley, ca
71399.52 points


1933 Willys Coupe

PostPosted: Sun Nov 04, 2018 12:04 pm    Post subject: Reply with quote

Paul P wrote:
Adam, I think he is talking about the breather hole for the gromet which is over size making the covers junk not the threaded baffle holding tapped holes. LOL Laughing


I love text!! LOL

I was talking about the new covers. The last few I bought were not threaded and gave you cheap screws that someone thought they would self tap.
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