Ventilating the Flat Head!

alan, mine is the same as yours, filler tube only. however---i have a small vent on the side of oil pan that seems to pull some air in. this is factory original. it appears there were many variations on these engines.
 
Not all intakes are created equal. I ran a super dual with a pair of Holley 94's that had a fitting and tube that went back to the breather/oil fill tube at the rear of the intake. My current offy and single quad is set up a bit different and the breather at the rear is fine. I use the fitting at the rear of the intake below the carb as my vacuum and trani set-up.
 
Petey, are you talking about the vent at the passenger bottom front of the engine??.....that's your down draft tube to let the fumes out.....Mike
 
I'm not sure about 8ba but here is the illustration from the Ford Passenger Car Sales Handbook for the 59A-B showing the path of crankcase ventilation. I would think the 8ba is similar.
CrankcaseVentilation.jpg
 
peteyshoes said:
i have a small vent on the side of oil pan that seems to pull some air in.
Click to expand...

The movement of air past that vent actually creates a vacuum that draws the air out of that vent, thus creating the draft from the oil filler cap through the engine as in my illustration.
 
It goes in[air] at the top and exits at the front bottom of the oil pan or the road draft tube.I thought i explained that to you on the phone.You need the road draft tube to make that work right. He has the wrong yr manifold on a later engine.Early manifold on a late engine. ken ct.Evidently he dosn't understand what hes got there. The air flow will not go in the same hole and come out the same hole.
 
Well, Old Henry, some of us figured Old Henry Ford had it all bassackwards and this is the sorta of the way some of us do positive crankcase ventilation now. But I'm not naming names. 8^) Jack E/NJ

pcv-1.jpg
 
Jack E/NJ said:
Well, Old Henry, some of us figured Old Henry Ford had it all bassackwards and this is the sorta of the way some of us do positive crankcase ventilation now. But I'm not naming names. 8^) Jack E/NJ

pcv-1.jpg
Click to expand...

The problem with running it backwards like that is that you have nothing filtering the air that's going in at the bottom so you can suck in anything that's being kicked up by the front right tire that's right there - dirt, dust, mud, water. Not good. That's why there's a filter on the oil filler cap that has to be cleaned every 1,000 miles - 'cause that's where the air goes in, not where it comes out.
 
Note also, the crankcase filler cap is a Chrysler PCV style filled with stainless steel mesh to prevent backfire into the crankcase.

Jack E/NJ
 
Flatjack9>>>Note that your diagram does not show any of those items clearly.>>>

Sorry diagram was not so clear on oil breather cap, image shown below. The vent filter is simply a fine mesh screen wrapped around and secured to the vent body(I'm using a stainless steel coffee filter screen from WalMart). You can even use fiberglas or aluminum window screen material wrapped a few times around the vent. Hard to show all this in Old Henry's diagram --- it was hard enough reversing all the airflow arrows
breather.jpg
so they all pointed in the right direction. 8^)

Jack E/NJ
 
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