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Post by dadbif on Jun 17, 2021 12:47:31 GMT
I don’t believe it!
Fit wrong rocker cover.
Get oil blow by.
Fit oil catch tank.
It fills up.
Bit of root cause analysis might give a clue?
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Post by howardb66 on Jun 18, 2021 8:09:39 GMT
Crumpets do you have the original cam cover & give that a try?
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Crumpets
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Post by Crumpets on Jun 18, 2021 13:15:44 GMT
the fact that the oil was previously ONLY going via the rear port means that that port has the worst baffling and a path of no resistance for the oil to escape. you want to stop flow out that rear oily one, it should be no flow or mostly flow in the opposite direction.. (hence the small filter + draft tube idea I ventured earlier) simple fix now is : block the rear port and only use the side port where the PCV was (and now the barb is). it's higher and the baffling is superior I'll try this and report back as to how I get on. Thank you atlex I realise catch cans are required for the track, for obvious reasons, but why have they become an aftermarket “fashion accessory”? I have no such contrivances in my car, do not suffer oil leaks, and my small breather filter on the exhaust side remains dry. Excessive oil misting would indicate to me that you are suffering from piston blow by…. or have induced, by modification, a pressure imbalance in your engine. But I’m old and like to keep things simple, what had Mazda done that was so wrong with their exhaust gas recirculating system? I'd agree with you on that i perhaps a pressure imbalance is what has been caused. I installed a catch can to try and prevent any issues caused from blow-by down the line (In a kind of, overkill measure really) but alas here i am with issues. Every day is a school day and here I am learning. Hindsight is always 20-20  I don’t believe it! Fit wrong rocker cover. Get oil blow by. Fit oil catch tank. It fills up. Bit of root cause analysis might give a clue? Not quite how it happened, the rocker cover is from a 1989-1994 Mazda 323 with a BP-T engine, part of the same BP family. (Although the baffling has been modified previously to work with my BP) I didn't fit the catch can because of the blow-by, I carried out a few modifications at once (Turbo, Rocker cover, Catch can.) I am seeking advice from people with lots more experience than me on the subject rather than reverting it all back. Root cause analysis would involve removing all this at once, but I am going through the process of eliminating things one at a time. Thanks for your comments though. Crumpets do you have the original cam cover & give that a try? I do bud, I'm going to be trying this to ascertain if this is indeed a/the fault. I will keep this thread updated. |
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Post by dadbif on Jun 18, 2021 13:56:44 GMT
Good luck
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Post by howardb66 on Jun 18, 2021 14:34:22 GMT
Hope you find a solution.
On my set up with the std cam cover is pcv on the inlet side & catch can (ok it’s a coffee mug) on the exhaust side. With my SC & then turbo’d setup, barely a dribble of oil in the can.
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Post by dadbif on Jun 18, 2021 21:26:16 GMT
Same as mine, except I have a small filter on the exhaust side.
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Crumpets
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Post by Crumpets on Jun 24, 2021 21:15:18 GMT
So the car has been sat tucked away in the garage for a week due to crap weather.
Yesterday I blocked off the rear port on the valve cover, so now I'm only running the one (side by intake mani) port without a PCV. This is running to atmosphere via the catch can. Hopefully this solves the problem, and as soon as the rainy period passes I'll take it out, we will see  |
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Post by dadbif on Jun 25, 2021 6:25:20 GMT
Just re read your thread, do you have a breather on the exhaust side, or is there no facility for such in your current rocker cover?
The one that was originally plumbed back into the intake using the rather natty little chrome pipe, and that drew air out of the rocker cover using intake vacuum.
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Crumpets
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Post by Crumpets on Jun 25, 2021 12:44:59 GMT
Just re read your thread, do you have a breather on the exhaust side, or is there no facility for such in your current rocker cover? The one that was originally plumbed back into the intake using the rather natty little chrome pipe, and that drew air out of the rocker cover using intake vacuum. Hey dadbifThe rocker has two ports to breathe, one on intake side (Where the port is on a stock BP cover) and then one on the back. I'm pretty sure most of my issues are caused by the one at the back, but i'm yet to confirm. |
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Post by dadbif on Jun 25, 2021 14:52:38 GMT
Where did the rear one go to in the original application?
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Post by atlex on Jun 25, 2021 15:06:47 GMT
Where did the rear one go to in the original application?  |
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Post by atlex on Jun 25, 2021 15:13:50 GMT
or what I'd call the "filtered air source" (in this case, metered also, it's going to a hose past the MAF/AFM) :-) it was never meant to have much coming out, mostly air going in. even a turbo motor spends most of its time in vac.
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Post by dadbif on Jun 26, 2021 6:54:40 GMT
Looks like they both go to the intake at different points, is there an EGR valve involved?
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Post by atlex on Jul 8, 2021 14:47:25 GMT
did what I suggest improve anything ? :-)
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Crumpets
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Post by Crumpets on Jul 10, 2021 17:38:08 GMT
did what I suggest improve anything ? :-) To be honest I haven't been able to do very many miles on the car in the past few weeks, so far so good but i've only done around 20 miles. I will update when i've had a chance to confirm but the weather hasn't been the best so I haven't taken the car out! |
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le sigh