[34PKUP]

Originally Posted by moefuzz

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part two, 'Pictures' for this tech article will be up shortly.....



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 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 vacuum leak unto an engine. While a great idea when it was designed, it was obsolete when the idea of a closed System with a proper PCV valve was invented. Having a huge vacuum leak causes your engine to run just a little less efficiently than when not having a gaping hole/road draft tube installed.

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 road draft tube will (at times) be actually sucking in air/dirt/moisture and debris as you drive along.. To put this into perspective, At idle and part throttle, your engine makes vacuum and the road draft tube is the open end were the internal vacuum can "draft" air into the engine.
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): 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.


H): eliminating the "open" hole of the road draft tube has the effect of "tightening up" your engine vacuum -in general-.
As a side benefit of enclosing or eliminating the road draft tube, your engine vacuum is increased which in turn helps thing like vacuum wipers work a little bit better as your engine is better able to regulate an enclosed or regulated crankcase as opposed to just having a gaping hole.


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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 summing up, A regulated air flow thru your engine is far superior to just having the "gaping hole" of a Road Draft Tube as pointed out thru the many benefits as listed above..




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part two, 'Pictures' for this tech article will be up shortly.....

Wow! and I thought I was confused