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 5Likes
12-24-2021, 04:49 PM
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CC Member
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Join Date: Jun 2020
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Cobra Make, Engine: BDR build #983, FRM 392
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PCV valve location
I believe that I already know the answer to this dumb question, but does it matter which valve cover the PCV is on and which valve cover the breather is on? I want to swap the two for aesthetics.
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12-25-2021, 05:49 AM
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As no one else is rushing to offer an answer, I'll offer my opinion. I can't see why it would make any difference whether the valve or breather was on one side or the other.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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12-25-2021, 08:24 AM
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Are you talking about front vs back of the same side or left vs right? If left vs right it does matter and they cannot be swapped. See the discussions about oil catch cans for the reason.
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Tony
CSX4005LA
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12-25-2021, 10:27 AM
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Quote:
Originally Posted by twobjshelbys
Are you talking about front vs back of the same side or left vs right? If left vs right it does matter and they cannot be swapped. See the discussions about oil catch cans for the reason. |
I'm talking left vs. right. The link you provided did not work. It just sent me to the Amsoil website. |
12-25-2021, 10:37 AM
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I think maybe
Maybe because usually the oil fill is on the drivers side? Also does the way the rotating bits throw oil, is there more oil ‘fog?’ On one side that the other? You would want the pcv on the ‘dryer’ side right?
In short i have no idea, mine is on the passenger side…
Merry Christmas 21
Steve H
Spf 1764
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12-25-2021, 11:57 AM
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Quote:
Originally Posted by tortuga
You would want the pcv on the ‘dryer’ side right?
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No. The purpose of the PCV is to recirculate oil "blow by" and other leakages back into the intake combustion side. The amounts are miniscule and contrary to the catch can propaganda do not affect octane or any other operation. Unless something is dreadfully wrong.
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CSX4005LA
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12-25-2021, 11:55 AM
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Quote:
Originally Posted by SBSerpent
I'm talking left vs. right. The link you provided did not work. It just sent me to the Amsoil website. |
That link is one of the automatic links. You'll have to use forum search for "catch can". In essence, one side has positive pressure (the side with the PCV, which is why catch cans work, and the other side will be neutral or small vacuum (which is why catch cans on the other side don't get anything unless something is awfully broken). The PCV has to be on the high side.
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12-25-2021, 12:35 PM
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Quote:
Originally Posted by twobjshelbys
That link is one of the automatic links. You'll have to use forum search for "catch can". In essence, one side has positive pressure (the side with the PCV, which is why catch cans work, and the other side will be neutral or small vacuum (which is why catch cans on the other side don't get anything unless something is awfully broken). The PCV has to be on the high side.
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Ah, ok. So you're saying that there is an internal pressure differential between left and right sides of the engine? My PCV is currently located on the drivers side (Ford Racing Motor 392CID w/ Holley 750) |
12-25-2021, 01:00 PM
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Then why did Ford put the pcv on the driver's side in the 1978 Bronco?
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12-29-2021, 03:51 PM
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Quote:
Originally Posted by twobjshelbys
That link is one of the automatic links. You'll have to use forum search for "catch can". In essence, one side has positive pressure (the side with the PCV, which is why catch cans work, and the other side will be neutral or small vacuum (which is why catch cans on the other side don't get anything unless something is awfully broken). The PCV has to be on the high side.
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That is a mechanical impossibility. Crankcase pressure is ALWAYS the same within any engine, left to right, top to bottom. Unless we have multiple crankshafts geared to together like in a square 4 or tandem twin.
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Gary
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12-25-2021, 02:18 PM
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First, I've not heard of the crankcase pressure being higher on one side of the engine than the other, and it doesn't sound right to me. Second, I looked at a few old threads re "catch can" and didn't see anything about crankcase pressure. So I'd like to see a link to the discussion that does. Third, I did find a discussion that suggested that the right side valve cover would have a higher oil level (and thus more oil droplets in the vapor) in race cars driven by high level drivers on a counter-clockwise course. That is because the G forces would pull oil toward the outside during the mostly left hand turns. As the OP is not likely to fall into this category of user, I stand by my earlier opinion that it doesn't much matter which valve covers has the PCV connection and which has the breather.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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12-25-2021, 02:20 PM
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Quote:
Originally Posted by Tommy
First, I've not heard of the crankcase pressure being higher on one side of the engine than the other, and it doesn't sound right to me. Second, I looked at a few old threads re "catch can" and didn't see anything about crankcase pressure. So I'd like to see a link to the discussion that does. Third, I did find a discussion that suggested that the right side valve cover would have a higher oil level (and thus more oil droplets in the vapor) in race cars driven by high level drivers on a counter-clockwise course. That is because the G forces would pull oil toward the outside during the mostly left hand turns. As the OP is not likely to fall into this category of user, I stand by my earlier opinion that it doesn't much matter which valve covers has the PCV connection and which has the breather.
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What do you bet that if you hunt around you can find that exact same engine in something else from Ford, or a different year, that has the PCV over on the other side. |
12-25-2021, 04:31 PM
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Or these...
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12-28-2021, 05:26 PM
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The 400ci is a cleveland.
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CSX4005LA
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12-28-2021, 05:33 PM
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Quote:
Originally Posted by twobjshelbys
The 400ci is a cleveland.
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And why would that matter? And how 'bout the 351M in my Post 16? |
12-28-2021, 05:35 PM
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Quote:
Originally Posted by patrickt
And why would that matter? And how 'bout the 351M in my Post 16?
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Cleveland and Windosrs are hugely different designs. I don't know about the 351, but don't have time to dig deeper. More important things to do right now.
My statement stands: Leave the PCV on the side in which it was installed.
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CSX4005LA
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12-28-2021, 05:38 PM
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Quote:
Originally Posted by twobjshelbys
Cleveland and Windosrs are hugely different designs. I don't know about the 351, but don't have time to dig deeper. More important things to do right now.
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Uhhh, no... nothing is more important than this thread.  |
12-28-2021, 05:40 PM
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I keep waiting for Brent to pipe in. He knows...
A brief search (really, I don't want to spend more time on this right now) for "pcv which side" hits mostly on GM products, which I believe use the opposite side of Fords, but it always says that one side will have suction and the other pressure, and the pressure side is the PCV side. Why that happens I don't know - I'd think the engine would be rather symmetrical. But it is logical since if both sides had pressure (and thus large amounts of blow by) that there would be PCV on both sides.
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Last edited by twobjshelbys; 12-28-2021 at 05:49 PM..
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12-28-2021, 05:58 PM
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Quote:
Originally Posted by twobjshelbys
I keep waiting for Brent to pipe in. He knows...
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Brent hates PCVs. But I suspect if there is an answer, he will know it. |
12-29-2021, 12:54 PM
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Quote:
Originally Posted by twobjshelbys
I keep waiting for Brent to pipe in. He knows...
A brief search (really, I don't want to spend more time on this right now) for "pcv which side" hits mostly on GM products, which I believe use the opposite side of Fords, but it always says that one side will have suction and the other pressure, and the pressure side is the PCV side. Why that happens I don't know - I'd think the engine would be rather symmetrical. But it is logical since if both sides had pressure (and thus large amounts of blow by) that there would be PCV on both sides.
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In an OHV V8 the pressure would be equal on both sides because they're connected through the pushrod gaps and the lifter valley.
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Brian
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