[moefuzz]

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No need to spend $50 bucks on someone's wizzy "PCV" kit,
For around $5, you can install a PCV system on your Flathead..







There are many benefits in replacing the road draft tube with a proper Positive Crankcase Ventilation system on your Late model Flathead V8.


A): it helps eliminate the embarrassing smelly/hot fog that wafts out from under your hood at the stop light.

B): It helps to create a consistent vacuum inside the crankcase and oil galleys.
An actual vacuum/draw inside of your crankcase will aide in keeping the oil and oily residues from being pushed out from every available seal, gasket or open "hole" that is and/or resides in what we think of as an automobile engine.

C): A PCV system will help eliminate moisture that can and will accumulate in your engine oil and hence your oil pan, engine and intake galleys. Moisture is a major cause of internal engine sludge that builds up (over time) and generally coats all manor of things like intake valves, stems, springs and lifters.

D): When you think about it, The road draft tube is actually just a huge open leak unto an engine. While a great idea when it was designed, it was obsolete when the idea of a closed or semi closed System with a proper PCV valve was invented.

E): Eliminating the road draft "hole" and replacing with a proper PCV sets you on the path of creating an enclosed (as opposed to wide open hole) oil galley and crankcase. which brings us to;

F): Eliminating the open hole of the road draft tube shuts out the probability that the filler cap/breather will suck in air/dirt/moisture and debris as you drive along..
At throttle and while working the engine, your engine creates Pressure and this pressure will be pushed out the road draft tube (not to mention and/all gaskets/seals and other non sealed surfaces) and along with the pressure comes hot fog/moisture and oily residues..
Which directly relates to;

G): oily/grime. As you drive/work the engine, the inherent pressure of the working engine escapes from every available seal/gasket etc. and carries with it oily residue that coats your clean engine, engine compartment, firewall, chassis eventually swirling around and being carried away at and around your rear bumper...
...At working pressure, Everything accumulates an oily coating, even the guys headlights in your rear view mirror.

If an engine didn't have an open port like the road draft tube and filler cap,
at speed/work, the oil pan would become pressurized to the extent that it could deform
or balloon the oil pan.
This especially true of race engines with high lift cams.
At speed/load, Vacating the pressure is a priority.


H): rerouting the "open" hole of the road draft tube has the effect of "tightening up" your engine vacuum under load/work. Installing a regulated valve in the form of a PCV has the effect of regulating drafts(vacuums) and working pressures that build in the crankcase at various engine rpms and loads.
As a side benefit of enclosing or eliminating the road draft tube, your engine vacuum is aided by way of allowing built up pressures in the crankcase to be directed into the intake where the cylinders draw it into the combustion chamber.






The PCV valve in itself is similiar in principle to a common regulator found on things like air compressors and/or oxy acetylene bottles.
:A PCV valve restricts and regulates air flow in one direction.







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