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Originally Posted by buffon01
(Post 879428)
Quick stupid question. I'm still out of a job and I need to fix my blow-by issues, can I get away with blocking off the IM port and placing a filter on the hole in the intake side of the valve cover?
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Yea that's what I meant. Block port in IM and have filters on both valve cover holes. I currently have only one hole with a filter and the other with the stock pcv system.
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I thought most people capped the passenger side and run the driver side to a catch can.
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Originally Posted by dgmorr
(Post 879466)
I thought most people capped the passenger side and run the driver side to a catch can.
I am currently waiting on my next VC to get finished. I am putting 3 -10an bungs on it and am planning on running them to 2 separate catch cans. I will post pictures as soon as I get it back from the shop who is doing the welding. |
In for results
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I saw a car the other day at the track that had the valve cover lines go to a re-purposed canister previously used for the AC, so that the oil had a place to go when pulling g's. the canister would drain the oil back to the oil pan. a linethen connected to a catch can for the vapors. the canisters are almost free at a parts yard so this might be a good, cheaper option instead of running two catch cans. the car was an extremely well developed audi 5cly with a very large turbo.
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4 Attachment(s)
$50 BMW M5 separator sliced open:
https://www.miataturbo.net/attachmen...ine=1340121952 How cyclone separators work: https://www.miataturbo.net/attachmen...ine=1340121952 |
Originally Posted by Spookyfish
(Post 890910)
In for results
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interesting. seems like a good simple solution.
I recently tried to modify a $10 ebay catch can to make it work properly but I ran out of time and had some issues making my copied design work so I decided to buy a new one from a local speed shop with built in baffles to get the job done. I'm thinking about modifying it to delete the air filter and feeding the intake line pressure but I'm not sure if this is worthwhile. thoughts? |
Originally Posted by bbundy
(Post 716427)
Mine was sucking oil out the catch can and making huge clouds of smoke the first time I tried it on the track. A combination of some on off throttle, high G left turn, with hard acceleration off a left hand corner puked lots of liquid oil into the catch can faster than it would drain back.
Solution: eliminated the vent on the intake side that was the stock PCV port and problem dissapeard. I’m just using the valve cover vent that comes out on the exhaust side which is baffled to the center of the valve cover. I also have a vent hose going into the side of the block by the alternator same location as some 1.6l blocks have a capped off port. I also found a PCV valve that fit perfectly to work as a check valve in my return hose to the very bottom of the pan. What I learned is the baffleing for the PCV port in the valve cover dosn't work. oil must pool up in the back right corner of the valve train where the stock baffling has its inlet on that side. Bob I'm guessing the vent line from the block and exhaust side valve cover both go to a catch can which is vented to atmosphere? Cheers |
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Bring this thread back as I'm in the process of building my motor now. It has been discussed about how to vent the gasses from the block under boost. I was looking at the vent hole that is raised and located at the back on the passenger side. It appears that port and the one ahead of it connect together along the side of the block right where the BP lettering is and then goes down to a very large casting hole, you can see it when you look inside the block. Has anybody drilled a block vent hole there? It's high enough in the block that G-forces on the oil wouldn't be a factor there. 3/8" NPT with a 90 pointing up would ensure any stray oil would drain back. Has anybody else thought of this? Downside?
https://www.miataturbo.net/attachmen...ine=1351734671 https://www.miataturbo.net/attachmen...ine=1351734671 https://www.miataturbo.net/attachmen...ine=1351734671 https://www.miataturbo.net/attachmen...ine=1351734671 |
So on the track at what WHP level and boost/turbo size is everyone seeing these issue's? 250whp? 300? 350? Im not going for crazy power on my build, 250 to 275whp tops. Im just not trying to over build with some over the top case breather, pan return,... setup. Also its a fresh 84mm 9:1 2554 for now later either 2860 or 2871. Also yes track use with the sticky shoe's!
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I'm at 260rwhp or something and do need the catch can
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Originally Posted by VW_Morrell
(Post 947627)
So on the track at what WHP level and boost/turbo size is everyone seeing these issue's? 250whp? 300? 350? Im not going for crazy power on my build, 250 to 275whp tops. Im just not trying to over build with some over the top case breather, pan return,... setup. Also its a fresh 84mm 9:1 2554 for now later either 2860 or 2871. Also yes track use with the sticky shoe's!
Just VTA your breather and drill out and VTA your PCV. Done |
This blow-by is probably normal with forged pistons and cold engine, right?
I don't know what they are putting to E85 bioethanol here. That 0.5 liters in catch can is how much I get in there in one week. It’s some kind of alcohol / water / oil mix. It burns with blue flame |
How do you have the lines to your catch can run? Are they stock sized lines?
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Originally Posted by shuiend
(Post 952269)
How do you have the lines to your catch can run? Are they stock sized lines?
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Could you running a little too rich? Unburnt fuel in the crankcase? Stuck Injector?
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Originally Posted by 2manyhobyz
(Post 952307)
Could you running a little too rich? Unburnt fuel in the crankcase? Stuck Injector?
As I’m not the only one my area who has to empty catch-can once a week I'm sure it has to do something with the special blend E85 that we use here (a.k.a. RE85). More info here: In English - St1's Sustainable Bioethanol |
Ok, I've searched n00b search! (I even like searching.) But here's a question.
I'm getting what seems to be boost leaking through the PCV, pressurizing the crankcase and then oil leaks out from all over the place on the block. Only happens on track - I don't WOT on the street (scared of civilians). I had reduced this a lot before with a 323GTX PCV but now it's back. New wastegate actuator is at 8 psi or so, I think the old one maybe was a tick lower. I'm tired of this and just want it to go away. I'm planning to plumb in a proper check valve (I'll leave the PCV in there to make the car look as CA compliant as possible in case of any roadside inspections). Also doing a catch can, but was planning closed loop on that rather than vent through a breather (but I'll do that if I can't fix this crankcase pressure otherwise). Question is... exactly what kind of check valve should I get and where do I get it? |
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