hey all, yes I have read the posts on PCVs, but havent got what i need from them. On my motor (99A) the pan has a breather section that comes up into the valley via a channel thru the front of the block, and then up a steel tube which on my engine goes nowhere, as I am running an early edelbrock super Dual manifold. to run a PCV i am thinking i should simply tap the pcv into the bottom of the manifold ,then the inlet is simply hanging down into the valley. To 'encourage' the vapours to use this exit rather than the breather exit into the front of the oil pan (which I ***ume has a road draft tube type of operating principle..)I thought I should restrict the top of this steel tube..with a small hole still clear, to allow anything the PCV doesnt draw into the inlet , to escape. I have an original fuel pump stand with a filler /breather still mounted, as i guess this is the main inlet for air into the crankcase. I guess I just need some feedback on this, any ideas or real world experience would be helpful.. where would you position the PCV? towards the front of the engine away from the breather seems sensible to me.. The PCV i have has a pipe thread end, so its a cinch to attach to the manifold, but do they function ok upside down ? any thoughts welcome.
got buried quick! anyone attached a PCV to the under side of a flatty manifold, just ****in in the valley space? is it going to work?? 8BAs are easy to do, I have succesfully done one, and it made a real difference to that car, and want to do it on mine, the engine architecture kinda works against you on an early block...
You can close off the breather at the oil fill tube and run the pcv to the manifold on the outside. The ventilation will just run in reverse. Lots of information on that installation too. In order to get a true PCV one breather must be close so the vacuum does the job.
You could close that front tube off completely if I'm understanding your description, I'm not really familiar with that design... Does it have a breather or an outlet on the pan for a road draft tube???You just need a source of fresh air and a vacuum source to hook the PCV valve to. It will work hanging in the valley, crankcase is crankcase... I have an 8ba I'm going to be doing the same thing to here soon...
I've seen it done as you describe only the PCV valve was mounted horizontally using an elbow in the bottom of the intake. I think that most threaded PCV valves were made to mount horizontally. Many of the type designed for a rubber grommet need to mount vertically. It really depends on the PCV that you use. If you know the application, mount it as it was on the donor engine....horz or vert. Keep the breather on top of the fuel pump stand as an inlet for the fresh air if you can. If you want to lose the stand then you will need to add a new breather for air to enter somewhere. I was planning to add hot rod breathers to the pan like the old timer hotrodders did for more air inlets to the engine. (I think they look cool) I add strips of Scotchbrite to the inside of the breather to filter out any dirt. I would think about some kind of oil baffle for the intake of the PCV valve in the valley.
Block the breather hole in pan...that is the original OUT for the system, plumb or put PCV drawing on both sides of manifold in pan OR externally pulling from side of generator area above that tube. Described the original Ford PCV setup in a post in the last couple of days...used for durability in Military and industrial flatheads. This becomes part of your air/combustibles for the manifold, too, which is why you want to tap both halves of intake system. This is the root of the inside mount...with non-stock manifold it is hard to tap both sides on the outside.
I installed a PCV valve in one of the intake runners on the underside of my Thickstun PM-7 intake several years ago and its works great. The engine now has 6,000 miles on it (relax, I did design better looking coolant hoses!) and there is never any smoke or vapor from the oil filler tube. The PCV valve ****s it all into the engine and out the exhaust. The block is a 59A with late cylinder heads.
Thankyou all very much! So i think the course of action is.. - Block off the front tube entirely (easy done) -tap under the manifold into the two 'plenum' areas there ,so signal comes from all cylinders -Join the two with tube to the PCV and leave it hanging towards the front of the valley area -Leave the fuel pump breather as is (I have a nice new breather on it.) I just have to make sure the PCV I have normally operates horizontally...quick phone call on that one. I really appreciate the help, for some reason vacuum stuff always confuses me, must be cos its too close to home. I ****
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