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Old 03-05-2012, 08:35 AM   #1
Forever In Stone
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Default Ventilating the Flat Head!

Does the 8ba Flathead get enough ventilation through just the oil filler pipe? My motor does not have any other means other than this oil fill pipe.
Your thoughts please!
Thank you, Alan
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Old 03-05-2012, 08:54 AM   #2
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Default Re: Ventilating the Flat Head!

It should have a crankcase breather pipe on the intake manifold.

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Old 03-05-2012, 09:38 AM   #3
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Default Re: Ventilating the Flat Head!

Are you saying that you don't have a road draft tube on the front of the intake manifold?
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Old 03-05-2012, 09:48 AM   #4
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Default Re: Ventilating the Flat Head!

There needs to be an "inny" and an "outy".
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Old 03-05-2012, 10:18 AM   #5
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Default Re: Ventilating the Flat Head!

You could put a PCV valve in place of the road draft tube and run the line back into the carb.
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Old 03-05-2012, 10:28 AM   #6
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Default Re: 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.
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Old 03-05-2012, 10:53 AM   #7
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Default Re: Ventilating the Flat Head!

Quote:
Originally Posted by peteyshoes View Post
i have a small vent on the side of oil pan that seems to pull some air in.
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.
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Old 03-05-2012, 10:34 AM   #8
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Default Re: Ventilating the Flat Head!

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.
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Old 03-05-2012, 10:46 AM   #9
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Default Re: Ventilating the Flat Head!

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.
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Old 03-05-2012, 09:58 PM   #10
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Default Re: Ventilating the Flat Head!

Quote:
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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.
i thought that blow-by comes out of the oil filler! LOL,
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Old 03-05-2012, 10:56 PM   #11
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Default Re: Ventilating the Flat Head!

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i thought that blow-by comes out of the oil filler! LOL,
If the baffle tube is left out you'll get a lot of blowby out of the oil filler.
Mine was left out and it had lots of blowby I put the tube in and almost stopped it completely. Also with the tube out it defeats the ventilation system. Bill
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Old 03-06-2012, 01:30 AM   #12
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Default Re: Ventilating the Flat Head!

Quote:
Originally Posted by Brendan View Post
i thought that blow-by comes out of the oil filler! LOL,
Wouldn't need the filter on the filler if that were the case.
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Old 03-05-2012, 10:38 AM   #13
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Default Re: Ventilating the Flat Head!

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
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Old 03-05-2012, 10:56 AM   #14
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Default Re: Ventilating the Flat Head!

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.
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Old 03-05-2012, 12:44 PM   #15
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Default Re: Ventilating the Flat Head!

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

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Old 03-05-2012, 12:49 PM   #16
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Default Re: Ventilating the Flat Head!

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Originally Posted by Jack E/NJ View Post
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

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.
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Old 03-05-2012, 07:45 PM   #17
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Default Re: Ventilating the Flat Head!

Quote:
Originally Posted by Jack E/NJ View Post
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

Positive crankcase ventilation uses manifold vacuum to pull the gases into the intake manifold, not through the carburetor.
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Old 03-05-2012, 12:57 PM   #18
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Default Re: Ventilating the Flat Head!

Note that there's an inlet air filter wrapped around the body of the crankcase vent.

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Old 03-05-2012, 01:01 PM   #19
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Default Re: Ventilating the Flat Head!

Note also, the crankcase filler cap is a Chrysler PCV style filled with stainless steel mesh to prevent backfire into the crankcase.

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Old 03-05-2012, 01:33 PM   #20
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Default Re: Ventilating the Flat Head!

Note that your diagram does not show any of those items clearly.
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