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Discussion Starter #41
Had a 64 or 65 Corvair company car,been awhile, memory kinda "dull". This was in 66....I think. In the 2 or 3 years I drove it the Company put 4 engines in the beast....had to tax related, wouldn't U think? Used more oil than "petrol".

Do you think the Spaten..Optimator, imported from Munich, is having an effect?
 

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The best solution is the 1 way vented cfm oil cap
Any pressure in crankcase , which comes from piston blow by , will blow out oil cap
If intake manifold is in vacuum state, and if it sucks air in through the dirty side PCV orifice. Then cfm oil cap will seal shut, and will not throw off fuel trims by allowing UN metered air into crankcase
Since crankcase no longer has positive pressure from piston blow by ... because of cfm oil vap
No crankcase gunk will be pushe out of crankcase via clean side PCV breather hose and into clean air air intake hose ( between air filter and throttle body)
Since crankcase sees zero psi pressure, it does not "pressure cook" the crankcase fumes and deposit them as "varnish" all over the inside of your crankcase.
Thus making your engine last longer.
My 2 cents ^^
A properly function PCV system will have negative pressure under idle and normal operating conditions, even wide open throttle. These modern PCV systems function differently than the older designs. Those with a true valve, air flow is one direction, and air flow between idle and open throttle is controlled by vacuum and the pintle in the valve. The orifice in these engines are used at idle operation. The pressure differential will create the necessary air flow and help the ECM regulate AF ratios. When the throttle is opened up air is drawn out of the crankcase by way of the intake housing, between the filter and throttle body. Using an unapproved, third party vented cap that will not meet emissions requirements and vents to the atmosphere will not prevent deposits, varnish, etc. In fact the combustion byproducts from the crankcase will combine with water, create acids and breakdown the oil and cause sludge and varnish much faster. The whole purpose is to rid the crankcase of these gases and safely burn them in the combustion chamber. On the EquinoxForum FB there is a detailed document on these systems. The same document was posted on TerrainForum.net by sydnesb. The intake and orifice location is different but the concepts are the same.
 
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