|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
03-05-2012, 03:43 PM | #21 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,943
|
Re: Ventilating the Flat Head!
Here's a pictorial of the 8BA crankcase ventillation system using the 8BA style intake manifold. If you install an electric fuel pump you can mount an oil fill tube and a road draft tube that would run down the back of the engine. Air passing beneath the road draft tube would pull air and gasses out of the crankcase. I recall seeing this on early Ford engines. The tube looked like electrical flex conduit but was larger in dia. The photo below shows an oil fill tube with cap I made . It mounts where the fuel pump stand used to be. If needed, a hole could be drilled in the side of the oil fill tube and a road draft tube inserted which would run down along side the bellhousing. The same thing could easily be made out of steel.
Last edited by 19Fordy; 03-05-2012 at 04:00 PM. |
03-05-2012, 05:42 PM | #22 |
Senior Member
Join Date: May 2010
Posts: 2,173
|
Re: Ventilating the Flat Head!
19Fordy>>> a hole could be drilled in the side of the oil fill tube and a road draft tube inserted which would run down along side the bellhousing.>>>
NO, your oil fill tube looks too pretty to drill for a draft tube! Why not use the Chrysler style baffled breather cap and run a draft tube from its tubing vent? Jack E/NJ |
Sponsored Links (Register now to hide all advertisements) |
|
03-05-2012, 05:52 PM | #23 |
Senior Member
Join Date: Jul 2010
Location: Queen Creek AZ
Posts: 519
|
Re: Ventilating the Flat Head!
This is what I have installed on my Lincoln motor. Lincoln V12 did not have a draft tube only rely on the oil cap that is vented.
Frenchy |
03-05-2012, 07:33 PM | #24 |
Senior Member
Join Date: May 2010
Posts: 2,173
|
Re: Ventilating the Flat Head!
Looks like you might've used the existing dipstip hole, Frenchy. Good choice for the draft tube! But what's that funny-looking can sticking out from the tube like a sore thumb? A baffle to catch road rocks?
Jack E/NJ |
03-05-2012, 07:39 PM | #25 |
Senior Member
Join Date: May 2010
Location: Yakima Washington
Posts: 913
|
Re: Ventilating the Flat Head!
|
03-05-2012, 07:39 PM | #26 |
Senior Member
Join Date: May 2010
Location: Gardiner Me.
Posts: 4,200
|
Re: Ventilating the Flat Head!
Sponsored Links (Register now to hide all advertisements)
|
03-05-2012, 07:45 PM | #27 | |
Senior Member
Join Date: May 2010
Location: Yakima Washington
Posts: 913
|
Re: Ventilating the Flat Head!
Quote:
Bill |
|
03-05-2012, 09:58 PM | #28 |
Senior Member
Join Date: May 2010
Location: At my kitchen table in Santa Rosa, Ca
Posts: 2,903
|
Re: Ventilating the Flat Head!
i thought that blow-by comes out of the oil filler! LOL,
__________________
If it would have been a snake it would have bit ya! i can't spell my way out of a paper bag! |
03-05-2012, 10:56 PM | #29 |
Senior Member
Join Date: May 2010
Location: Yakima Washington
Posts: 913
|
Re: Ventilating the Flat Head!
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 |
03-06-2012, 01:30 AM | #30 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Ventilating the Flat Head!
Wouldn't need the filter on the filler if that were the case.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
03-06-2012, 07:36 AM | #31 | |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,943
|
Re: Ventilating the Flat Head!
Quote:
|
|
03-06-2012, 09:26 AM | #32 |
Senior Member
Join Date: May 2010
Posts: 2,173
|
Re: Ventilating the Flat Head!
bbrocksr>>>Positive crankcase ventilation uses manifold vacuum to pull the gases into the intake manifold, not through the carburetor.>>>
There are two types of PCV. The first is on the low vacuum side of the carb into the air cleaner that works mainly at high throttle when blowby is greatest and usually doesn't include a PCV valve. The other is on the high or manifold vacuum side of the carb that works mainly at low throttle and includes a PCV valve that closes at high throttle. Most vehicles in the 60s and later had both types of PCV systems. Jack E/NJ |
03-06-2012, 10:55 AM | #33 |
Senior Member
Join Date: May 2010
Location: Cottageville, WV
Posts: 1,535
|
Re: Ventilating the Flat Head!
Let's hear from the originator of this thread.
Shadetree
__________________
Son, you will never blow an engine up in high gear. |
03-06-2012, 11:13 AM | #34 |
Senior Member
Join Date: May 2010
Location: Canada Where it snows
Posts: 2,058
|
Re: Ventilating the Flat Head!
This shows flow.The line from air cleaner to engine insures filtered air into engine.To replace air removed by pcv.Flow is from air cleaner to engine not engine to air cleaner.
|
03-06-2012, 11:41 AM | #35 |
Member
Join Date: Sep 2011
Location: middletown ny
Posts: 90
|
Re: Ventilating the Flat Head!
there is no road draft tube on my engine. there is a small baffled vent on the front, upper right side of oil pan. probably the predecessor of the draft tube. i know it works, as it will leave a film on pan after a good run.
|
03-06-2012, 12:05 PM | #36 |
Senior Member
Join Date: May 2010
Posts: 2,173
|
Re: Ventilating the Flat Head!
Ronnie>>>This shows flow.The line from air cleaner to engine insures filtered air into engine.To replace air removed by pcv.Flow is from air cleaner to engine not engine to air cleaner.>>>
Only at low throttle when the PCV valve is open. At high throttle, the valve closes due to low manifold vacuum at which point the flow is reversed by blowby and/or engines having crankcase venting. If you pull the tube connecting the air cleaner to the sealed PCV filler cap you will almost always see clear evidence of this reversed flow in the form of a milky residue of entrained crankcase moisture and oil that get by the filler cap's baffle material. Jack E/NJ |
03-06-2012, 02:09 PM | #37 | |
Senior Member
Join Date: May 2010
Location: Yakima Washington
Posts: 913
|
Re: Ventilating the Flat Head!
Quote:
Check the airflow on Ronnies post. Bill |
|
03-06-2012, 02:42 PM | #38 |
Senior Member
Join Date: May 2010
Posts: 2,173
|
Re: Ventilating the Flat Head!
Bill---No argument on PCV valve's backfire prevention or which direction it closes or the flow from the air cleaner when it is open at high manifold vacuum. But consider post #36 in the case where the valve is closed or nearly so and path of least flow resistance at low manifold vacuum.
At any rate, in a vented crankcase like the flathead, the use of a simple unrestricted (no PCV valve) reverse flow PCV system directly into the air cleaner cannister will indeed suck gases and blowby out of the crankcase and into the combustion cycle. Jack E/NJ |
03-06-2012, 02:50 PM | #39 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Ventilating the Flat Head!
I would wager that if you could measure the vacuum in the air cleaner canister there would be no measurable vacuum, certainly not enough to suck air backwards into the out vent where the airflow is creating much greater vacuum to suck it that way.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
03-06-2012, 03:03 PM | #40 |
Senior Member
Join Date: Jun 2011
Location: summerfield florida
Posts: 383
|
Re: Ventilating the Flat Head!
Is there any general agreement on the best/easiest/cleanest way to put a PCV system on a 8BA? Thanks...jack
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|