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Crankcase vent routing

  • balinwire
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03 Jul 2003 05:46 #435 by balinwire
Crankcase vent routing was created by balinwire
Crankcase emission?s on the Lycoming was not of much concern when the F engine was developed. With the negative breather vent tube going from the intake manifold to the air filter gave me concern.
All new autos since 1968 have a closed system with a similar ventilation system. Blowby exits the crankcase, enters the intake manifold and then is burned.
If excessive amounts of pressures build up in the crankcase or the vapors reverse there flow because of a backfire and there is a flashback into the crankcase, there could be a crankcase explosion tearing the crankcase apart. This is the reason for the PCV valve that will snap shut in case of a backfire, protecting the case.
The way the factory installed this ventilation system without a PCV one way valve seems a recipe for disaster. Am I mistaken or could or has this scenario ever occurred?

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  • Auburn/Cord Parts
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03 Jul 2003 20:50 #441 by Auburn/Cord Parts
Replied by Auburn/Cord Parts on topic Crankcase vent routing
This PCV system on the Cord keeps the oil in the oil pan as this is where the air enters the crankcase. The only danger would be if the fuel pump leaked and filled the oil pan with gasoline. The new PCV systems suck.

Stan

Auburn/Cord Parts, Inc. P.O. Box 547 1400 N. "A" St. Wellington, KS 67152 (620) 326-7751 This email address is being protected from spambots. You need JavaScript enabled to view it.

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