Crankcase ventilation

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Tom Hicks
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Crankcase ventilation

Post by Tom Hicks » Thu Mar 21, 2019 3:47 pm

I found this on FB. https://www.facebook.com/marketplace/11 ... oest=27932

It makes sense to me that a pipe run from the oil fill neck to the carburetor intake would suck air through the engine's crankcase, probably warm the air some too. But what does the fitting in between do, what does it connect to?
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Re: Crankcase ventilation

Post by Original Smith » Thu Mar 21, 2019 3:50 pm

There were probably two muffler clamps used to hold it up against the exhaust manifold.


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Tom Hicks
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Re: Crankcase ventilation

Post by Tom Hicks » Thu Mar 21, 2019 3:57 pm

Backside view:
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Re: Crankcase ventilation

Post by Tmodelt » Thu Mar 21, 2019 6:27 pm

I would only be guessing and I don't want to be included in the "well meaning but misinformed"group.

I am with Larry. It has to be the air intake for the carb to function correctly. This setup would also supply the venturi effect to aid in drawing the oily air / gasses of combustion mixture into the carb.

Under normal circumstances, at the area of the oil filler cap / breather any positive pressure generated in the crankcase would now be at atmospheric pressure and need to be drawn into the carb to be reintroduced into the combustion process.

I agree that this piece of unique equipment would also serve the function of a heat stove.


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Re: Crankcase ventilation

Post by Scott_Conger » Thu Mar 21, 2019 6:32 pm

original statement in error and retracted. cannot unpost
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Re: Crankcase ventilation

Post by Charlie B in N.J. » Thu Mar 21, 2019 6:39 pm

Might not be for a T. Or else what you have isn't the complete kit.
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Re: Crankcase ventilation

Post by Mark Gregush » Thu Mar 21, 2019 6:43 pm

I am doing somewhat the same thing, only my setup is only part of the air intake. The tube is in the air stream allowing the incoming crankcase fumes to be pulled in and mixed with fresh air.
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Re: Crankcase ventilation

Post by Altair » Fri Mar 22, 2019 1:09 pm

This would take some looking in to as the oil filler cap only acts as a vent to relieve crankcase gases created by what gets past the rings. There is no inlet system so you could not "suck" the gases out. A draft tube attached to the valve covers would complete the circuit. A good air flow through the system would work well. In later years when crankcase ventilation was introduced draft tubes was the way to go and to reduce the visible smoke the draft tube gases was reintroduced into the carburetor, good thought at the time, however it caused many problems. With a tired engine and leaking unburned fuel into the system serious explosions would occur blowing off fill caps and dip sticks. So not to be defeated a check ball was introduced to prevent explosive gasses from re-entering the system and they gave it a fancy name Positive Crankcase Ventilation aka PCV. A malfunctioning PVC system can cause serious problems. The safest and most efficient system is the draft tube. With a new efficient engine there is little to no issues with crankcase ventilation however with age and wear issues start to develop and redirecting unburned gasses back through the intake system is not a good idea as it just creates greater issues internally. Just exhaust those gases to atmosphere, it won't make your car any more efficient.


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Tom Hicks
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Re: Crankcase ventilation

Post by Tom Hicks » Fri Mar 22, 2019 2:50 pm

altair wrote:
Fri Mar 22, 2019 1:09 pm
This would take some looking in to as the oil filler cap only acts as a vent to relieve crankcase gases created by what gets past the rings. There is no inlet system so you could not "suck" the gases out.
I have a hole on each side of the block which the throttle rod goes through. If I clean the engine and rinse it with a stream from a water hose, water that goes in those holes goes directly into the crankcase. (How do I know that?) I also suspect that outside air can get into the crankcase through the valve area since the covers are not airtight. So my block has plenty of area for outside air to go in. And plenty does which is one reason the oil gets dirty so fast! I am not certain I want to encourage more of this unfiltered air to pass through my crankcase and contaminate my oil.
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