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EFV-8 Club Forum / General Ford Discussion / PCV in a Flathead?

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Discussion Topic: PCV in a Flathead?

wmsteed

05-06-2022 @ 7:33 AM

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Posts: 613
Joined: Oct 2009

Adding a PCV system to a pre- smog engine is one of the best modifications that can be done to an engine.
There are a lot of people that think the PCV system is an unnecessary government mandated to all vehicles made from 1963 on. The main feature of a PCV system is that it will eliminate 95% of the undesirable emissions that an engine produces.
The side benefits is that the PVC will eliminate blow-bye, eliminates condensation within the engine and thereby minimizes the production of sludge in the engine, additionally, the introduction of the crankcase blow-bye into the intake system can act as top cylinder lubricant.
The 8BA/8CM type of engines are very simple to add a PCV system too because they have a crankcase road draft tube port at the front of the engine where the PCV can be placed, then a 3/8" hose is attached to a good vacuum source that is located below the throttle plate in the carb. There is no need for a hose to be attached to the air cleaner.
The '48 and earlier flatheads are a little more difficult to attach a PCV to.
From my experience the easiest method is to drill a hole into the intake manifold, large enough to accommodate a thread-in type of PCV, in the front portion of the manifold, that access's the valve lifter chamber, then a vacuum source is located via a plate under the carb or a port in the intake portion of the manifold .
Fresh air will be drawn into the engine crankcase via the breather cap located on the fuel pump stand.
Some early flatheads have a crankcase breather located on the lower portion of the engine, this breather must be blocked off.

Bill
36 5 win delx cpe

40cpe

05-05-2022 @ 2:22 PM

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Some of the answers:
Engineers think it reduces emissions
pulling a vacuum on the crankcase helps reduce leaks
If the engine has blow-by, PCV can reduce or eliminate symptoms

This message was edited by 40cpe on 5-5-22 @ 8:34 PM

RAK402

05-05-2022 @ 1:42 PM

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I have seen that several people have blocked the vent in the oil pan and added a PCV to their flathead engine.

What is the benefit of doing this? (or is there a benefit of doing this?).

Inquiring minds want to know (and so does mine...).

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