montermahan Posted July 28, 2015 Share Posted July 28, 2015 (edited) I tried a lot of different thing's using the PCV Valve, First off was Pass side vent to inside aircleaner and the PCV valve hose to driverside top of cover, it sucked a lot of oil when turning hard to the right. Put on an oil accumulator, still sucked oil, (I hadn't found the USMB site yet so I never read a post stating to come off the PVC hose with a smaller host to air cleaner) but then I plugged the PVC outlet in manifold and run both vent hoses to inside of air cleaner. no more smoke, but it probably wasn't the best ventilation system for the motor. Then I copied an idea from the Corvair, , I drilled a .065 hole in the PVC hole plug and welded a piece of 1/2" pipe on that to hook hose to drivers side valve cover vent and run pass side vent to inside aircleaner. the .065 is always drawing a little air thru the engine, and the other side is sucking clean air from inside air cleaner. Thousands of Corvairs are running like this. Time will tell. If I hadn't already welded the PVC valve up to use as a plug, I could of probably put an .065 orifice in the PVC hose and still had the PVC Valve. I haven't run this to much on the road yet. Will post results as I get a few hundred miles on it. MM Edited July 28, 2015 by montermahan Link to comment Share on other sites More sharing options...
tweety Posted July 29, 2015 Share Posted July 29, 2015 What I've done is put the passenger (US) side valve cover hose to a miniature filter sprayed with K&N filter goo. That's that side done although you can place the hose to the air filter. Drivers side. I've run the hose directly to a catch can. Then from the catch can another hose. This hose goes to the "F" plastic fitting where there are two outlets, one 5/8" and one about 3/16". The 5/8" one goes to the PCV. The small one goes to the air filter. My understanding is, that when there is a spike of crankcase pressure when the PCV cannot handle it, the small hose will take that extra pressure to the intake. Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted July 29, 2015 Share Posted July 29, 2015 ... My understanding is, that when there is a spike of crankcase pressure when the PCV cannot handle it, the small hose will take that extra pressure to the intake. Yes and Not exactly. The idea of the "Detour" with a smaller diameter hose, is to avoid the PCV valve from Sucking Oil, so such small diameter hose, is some sort of pressure relief on the system. Otherwise, the vacuum from the PCV valve will suck Oil, instead of Fumes only. Kind Regards. Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted July 29, 2015 Share Posted July 29, 2015 ... This hose goes to the "F" plastic fitting where there are two outlets, one 5/8" and one about 3/16" ... That is Good, I used a "T" shaped fitting, with both main sides being 5/8" and one smaller side to the Relief written above... works the same. ... I hadn't found the USMB site yet so I never read a post stating to come off the PVC hose with a smaller host to air cleaner ... I bet that you found those posts Already here's one example, regarding how properly do the PCV connections on EA82's: ~► http://www.ultimatesubaru.org/forum/topic/114260-oil-catch-can-in-ea82/page-2 Kind Regards. 1 Link to comment Share on other sites More sharing options...
djellum Posted July 29, 2015 Share Posted July 29, 2015 I would think that the small hose would not carry much in the way of fumes. I don't really know how much flow is needed to keep the corrosive gases under control. Link to comment Share on other sites More sharing options...
montermahan Posted July 29, 2015 Author Share Posted July 29, 2015 I'm guessing, the small hose is to relieve some of the suction created by the pcv valve, thus not sucking oil out of the valve cover. Mine would only suck oil on a long sweeping curve, I was guessing there was so much vacuum, and centrifugal force, the valve cover was filling up with oil, then sucking it up the pipe, I'm talking about serious smoke. My .065 orifice should slow down the vapor flow and not suck up the oil. putting my finger over the passenger side valve cover vent will create a small suction, so I know it is pulling fresh air into the motor. also, That small of orifice, I didn't even have to re adjust the carb. Love that Weber. Time will tell. Like I said, this is what corvairs do. I would use a small filter on the passenger side, but I do a lot of gravel road driving, filter would clog up fast. Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted July 29, 2015 Share Posted July 29, 2015 ... the small hose is to relieve some of the suction created by the pcv valve, thus not sucking oil out of the valve cover ... Yes, Exactly! Link to comment Share on other sites More sharing options...
djellum Posted July 30, 2015 Share Posted July 30, 2015 yah i get that in a normal setup the smaller diameter hose is to relieve some pressure, but in his setup he basically is hooking a manifold vacuum line to the pvc outlet on the drivers side that pulls manifold vacuum to the crankcase. It will cause a vacuum leak to some degree, and I doubt it will flow enough fumes through a .065 hole to properly vent the crank case. Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted July 30, 2015 Share Posted July 30, 2015 ... I doubt it will flow enough fumes through a .065 hole to properly vent the crank case. Yes, also I think the Same. First I was trying to explain the reason for the "Detour" and its need on the PCV, Now he need to understand that the "Corvair" setup is not "Universal" for Boxers. Kind Regards. Link to comment Share on other sites More sharing options...
tweety Posted July 30, 2015 Share Posted July 30, 2015 Really informative guys. 1 Link to comment Share on other sites More sharing options...
montermahan Posted July 30, 2015 Author Share Posted July 30, 2015 (edited) By the way, a Corvair is a flat 6 engine, guess it could be called a boxer, but their case ventilation comes from the top of the crankcase, not the valvecover. any how, the .065 orifice was a little to much vent, would still pull oil on long sweeping corners. I changed the hole to .050 and it would go around 3 corners befor the line to intake would get enough oil to get to motor. I will get a new PCV Valve and put back in line, and along with the .065 orifice, will see if it still suck's oil. Not sure how the PVC Valve work's while running. If that dosn't work, I will build an accumulator to fit on top of the drivers side VC and will see if it will catch enough oil, then let it drain back in the motor after the corner. I built one befor, but was running it with the PCV Valve and no orifice and would fog up the valley on hard long turns. It would probably hold around 6 ounces of oil. I know it is drawing enough air to vent the motor cause it is sucking oil out of the valvecover, where as, with the T in the line system, it isn't. I don't know how oil flow's from top of the head back to oil pan, but I'm guessing, I have enough vacuum to keep this from happening properly, along with the centrifugal force of the corner.. This motor is in excellent shape, so that is not an issue. PCV Valve VS Orifice, - - - Not sure how the PVC Valve work's while running, but would guess both are Vacuum leak's to the intake.. I know how other's have done it, but It is no fun copying other peoples ideas. On VW powered trikes, I had plenty to do just keeping the motor running in top shape. Now with the Subaru Trike, I'm bored with nothing to do cept experiment with Montefications, just likeJesZeK and hundred's of others do. I love being retired. MM Edited July 30, 2015 by montermahan 1 Link to comment Share on other sites More sharing options...
tweety Posted July 30, 2015 Share Posted July 30, 2015 (edited) being individual with concepts sounds good but there are drawbacks. I used to build and fly my own radio model airplanes. I was not content to build standard designs so designed my own. After about 40 crashes not long after take off a friend asked me "why are you trying to reinvent the wheel"? Good point. As aerodynamics is an art and I was trying to prove it isn't. Same with the 38/38 carb on my ea81. Others wrote up in these pages how it wasn't suitable. But I'd read in Datsun 1200 and Holden Gemini pages that they used them. I was worried the 32/36 wouldn't be good low down for my automatic transmission. How wrong I was. So the big drawback is cost and time. So the ideal situation here is to take all ideas and proven concepts and come up with the best solution, not the solution that is "different" only. The PCV system has proven itself in likely thousands or tens of thousands of conversions. Anyway, no one is going to applaude someone for coming up with a better PCV system IMO. But they will applaude you if you found a better intake system or easy way to find an extra 20hp at the wheels. Cheers Tony Edited July 30, 2015 by tweety Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted July 31, 2015 Share Posted July 31, 2015 ... I'm bored with nothing to do cept experiment with Montefications, just like JesZeK and hundred's of others do ... Well, somehow Yes, but: ... "why are you trying to reinvent the wheel"? ... I really love to experiment and try new things, which I also like to share with people, to facilitate the life of others; however I am really aware that certain things are really Given, such things already are achieved by the "Trial and Error" of many people that went that way in the Past, and changing such given things is only a waste of time, and a risk to the engine / vehicle. The P.C.V. system on the Subaru EA series of engines, are one of those Given things that are not Rocket science, but really doesn't have room for too many "improvements" ... I hope you understand. Kind Regards. Link to comment Share on other sites More sharing options...
montermahan Posted July 31, 2015 Author Share Posted July 31, 2015 And if people didnt try something different now and then, we would all stil be rideing horses. The end Link to comment Share on other sites More sharing options...
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