To PVC or not to PVC?, What should a 74 2.0 have? |
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To PVC or not to PVC?, What should a 74 2.0 have? |
robkammer |
Dec 8 2021, 02:10 PM
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#1
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Member Group: Members Posts: 195 Joined: 7-January 21 From: Vermilion Ohio Member No.: 25,049 Region Association: North East States |
I'm in process of cleaning up all of the electrical and vacuum lines in the engine bay. The car does have a check valve of sorts, maybe a PCV. I read differing accounts of whether or not a 74 should have one or should it just be plumbed without?
And I've gotta say, it sure looks nice in there without any vacuum lines! Rob |
914_teener |
Dec 8 2021, 03:12 PM
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#2
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914 Guru Group: Members Posts: 5,245 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
I'm in process of cleaning up all of the electrical and vacuum lines in the engine bay. The car does have a check valve of sorts, maybe a PCV. I read differing accounts of whether or not a 74 should have one or should it just be plumbed without? And I've gotta say, it sure looks nice in there without any vacuum lines! Rob You should run one IMHO. Otherwise stock up on valve cover gaskets. |
emerygt350 |
Dec 8 2021, 05:04 PM
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#3
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Advanced Member Group: Members Posts: 2,410 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I'm in process of cleaning up all of the electrical and vacuum lines in the engine bay. The car does have a check valve of sorts, maybe a PCV. I read differing accounts of whether or not a 74 should have one or should it just be plumbed without? And I've gotta say, it sure looks nice in there without any vacuum lines! Rob You should run one IMHO. Otherwise stock up on valve cover gaskets. The 74 was a passive vent system into the air cleaner. I prefer the positive flow on my motors (like the 73) but if passive was good enough for Porsche/VW... You need it. 1) you don't want to vent that to atmosphere 2) gaskets 3) engines last longer if those gases are not in there too long. |
JamesM |
Dec 9 2021, 03:16 AM
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#4
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Senior Member Group: Members Posts: 1,965 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
I'm in process of cleaning up all of the electrical and vacuum lines in the engine bay. The car does have a check valve of sorts, maybe a PCV. I read differing accounts of whether or not a 74 should have one or should it just be plumbed without? And I've gotta say, it sure looks nice in there without any vacuum lines! Rob You should run one IMHO. Otherwise stock up on valve cover gaskets. The 74 was a passive vent system into the air cleaner. I prefer the positive flow on my motors (like the 73) but if passive was good enough for Porsche/VW... You need it. 1) you don't want to vent that to atmosphere 2) gaskets 3) engines last longer if those gases are not in there too long. Not sure exactly when the changeover was, but every 74 I have had has the PCV getting suction from the plenum. 75+ had the larger passive vent to the air cleaner. To properly remove it though you will need to swap both your plenum and airbox to later parts. I think there are pros and cons to both, the biggest con of keeping the PCV now is that new/good ones are near impossible to come by. Post pics of your plenum and I can tell you what you have. |
emerygt350 |
Dec 9 2021, 05:39 AM
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#5
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Advanced Member Group: Members Posts: 2,410 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
The last 74 I looked at was passive but perhaps it had been messed with.
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