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 5Likes
12-29-2021, 04:16 PM
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CC Member
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Location: Brisbane,
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Oil inside one breather filter and the other side dry is more to do with position front to rear of each breather. Are they both at the front?
Otherwise I still say can't happen.
PCV valve should be placed as high up in the engine, and so moving to the front of the engine, either side, is likely to have less splash oil go through the PCV valve. Factory baffles plates aren't very good, and some aftermarket are even worse.
Whichever side has the PCV valve, the other side is the fresh air inlet, and flows air in BOTH directions.
https://www.google.com/search?q=pcv+...ih=791&dpr=1.1
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Gary
Gold Certified Holden Technician
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12-29-2021, 05:58 PM
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Join Date: Jun 2020
Location: SoCal,
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Cobra Make, Engine: BDR build #983, FRM 392
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Quote:
Originally Posted by Gaz64
Oil inside one breather filter and the other side dry is more to do with position front to rear of each breather. Are they both at the front?
Otherwise I still say can't happen.
PCV valve should be placed as high up in the engine, and so moving to the front of the engine, either side, is likely to have less splash oil go through the PCV valve. Factory baffles plates aren't very good, and some aftermarket are even worse.
Whichever side has the PCV valve, the other side is the fresh air inlet, and flows air in BOTH directions.
https://www.google.com/search?q=pcv+...ih=791&dpr=1.1
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PCV is front of DS valve cover; breather is at the back on PS valve cover.
Why would there be more oil splash at the back of the valve cover vs front of the valve cover? |
12-29-2021, 06:07 PM
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
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I think the only reason the cap is on the front of one valve cover and the back of the other is because both valve covers are really the same. When you put the cover on one side of the engine the cap is on the front and if you put it on the other side it's on the rear. I think that's the only reason.  |
12-29-2021, 06:30 PM
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Quote:
Originally Posted by SBSerpent
PCV is front of DS valve cover; breather is at the back on PS valve cover.
Why would there be more oil splash at the back of the valve cover vs front of the valve cover? |
I would say because of the rearward tilt of the engine.
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Gary
Gold Certified Holden Technician
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12-29-2021, 06:32 PM
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Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
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Quote:
Originally Posted by Gaz64
I would say because of the rearward tilt of the engine.
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And maybe because you're driving forward.  |
12-29-2021, 06:36 PM
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Quote:
Originally Posted by patrickt
And maybe because you're driving forward. |
Yes, acceleration G force is under load, more blowby. Deceleration Gs are under coast, less blowby.
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Gary
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12-29-2021, 08:01 PM
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Join Date: Jun 2020
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Quote:
Originally Posted by Gaz64
Yes, acceleration G force is under load, more blowby. Deceleration Gs are under coast, less blowby.
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...and I assume that this theory applies to both BBs and SBs? Hmmmm |
12-29-2021, 08:04 PM
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BTW, this is opposite of the configuration that I have on my SB.
Seems to me that swapping my breather/PCV shouldn't be an issue. 😕
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12-29-2021, 09:19 PM
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Quote:
Originally Posted by SBSerpent
PCV is front of DS valve cover; breather is at the back on PS valve cover.
Why would there be more oil splash at the back of the valve cover vs front of the valve cover? |
Because the engine lower at the back, and oil moves rearward under acceleration. Yes, oil also moves forward under braking, but the engine presumably isn't revving as high, so therefore not pumping as much oil.
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Brian
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