 PCV (breather valve) Vacuum hose connection |
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| Montreal914 |
 Apr 23 2020, 11:55 PM
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#1
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Advanced Member  Group: Members Posts: 2,072 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California 
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Is there a reason why I see a lot of engines (2 liter) where the vacuum hose connected to the PCV, by the oil filler, is connected to the air cleaner box whereas in the diagram, it is clearly connected to the plenum? (IMG:style_emoticons/default/confused24.gif)
My guess is that if the PCV ever gets faulty, there will be a vacuum leak in the intake revving up the engine. Commonly seen (picture from a Google search):  Versus Dave's diagram:  |
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| Montreal914 |
Apr 24 2020, 02:01 PM
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Advanced Member Group: Members Posts: 2,072 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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It was a 2 liter in a 73 then bumped up to 2056 d-Jet. Now I am converting it to Microsquirt. The PCV is on the oil filler block and I am in the process of connecting the few vacuum hoses needed for the new setup.
I am trying to understand the reason for the case breathing to be connected to the plenum vs the air filter box. Seems to me it increases the potential leaks of the induction setup. If there is no good reasons to pull vacuum in the block, I would rather connect it to the air box. But since it was designed like that, I am sure there is a reason... Would like to know it. (IMG:style_emoticons/default/beerchug.gif) |
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| southernmost914 |
Jun 5 2020, 12:28 PM
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#3
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KEY WEST/HAVANA Tunnel Authority Group: Members Posts: 338 Joined: 16-October 07 From: Key West/ St. Augie, Fl USA Member No.: 8,234 Region Association: South East States
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QUOTE(Montreal914 @ Apr 24 2020, 04:01 PM)  It was a 2 liter in a 73 then bumped up to 2056 d-Jet. Now I am converting it to Microsquirt. The PCV is on the oil filler block and I am in the process of connecting the few vacuum hoses needed for the new setup. I am trying to understand the reason for the case breathing to be connected to the plenum vs the air filter box. Seems to me it increases the potential leaks of the induction setup. If there is no good reasons to pull vacuum in the block, I would rather connect it to the air box. But since it was designed like that, I am sure there is a reason... Would like to know it. (IMG:style_emoticons/default/beerchug.gif) Here ya go. https://members.rennlist.com/pbanders/PCV.htm |
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Posts in this topic
Montreal914 PCV (breather valve) Vacuum hose connection Apr 23 2020, 11:55 PM
JOEPROPER I think the picture is how late model '75 + ... Apr 24 2020, 06:21 AM Bleyseng The PCV hose gets connected to the branched elbow ... Apr 24 2020, 11:04 AM 914werke there is no PVC valve on late 75/76 cars Apr 24 2020, 11:55 AM Bleyseng Its hard to tell what year setup he is running but... Apr 24 2020, 01:22 PM JeffBowlsby Oil vapor blow-by piped into the air cleaner pre-f... Apr 24 2020, 02:01 PM
Montreal914
Oil vapor blow-by piped into the air cleaner pre-... Apr 24 2020, 02:03 PM |
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