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Old 06-12-2002, 02:01 PM
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Question Oil Leaks/PCV valve

I built a 305 SBC for a T-Bucket, and used a "breather style" filler cap. I was getting blow by on my aluminum valve covers and went to a PCV valve, and plugged the hole where the filler cap was. Now it seems like I have little oil "seeps" in various places on the engine. I have an Edlebrock Torquer cam. Is it possible that there is not enough vacuum to make the PCV valve work right?? I am assuming that the vacuum in the manifold has to be stronger than the pressure of the blow-by to allow the PCV valve to open. I thought of running two PCV valves to see if that would help. Not many miles on the engine yet, so I am hoping that the blow-by decreases as the rings seat. Any thoughts????

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Old 06-12-2002, 04:43 PM
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try an evacuator system on it, this will reduce the crankcase pressure without useing 2 PCVs
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Old 06-12-2002, 04:48 PM
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Where is your fresh air coming from to replace the crankcase emmisions? Without a fresh air source you will draw a vacuum on the crankcase and suck in your seals and gaskets, you must ventilate the crankcase. Use a line plumbed to your aircleaner for the fresh air instead of having an open breather on the valve cover. It's a lot less messy and due to the extra length will not spew oil around like the breathers do. I would use a baffled breather with a spigot so you can run a line to the air cleaner.
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Old 06-13-2002, 04:47 AM
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Sounds like you are both talking along the same lines. I haven't built anything since the early 70's and am not up on the evacuator system, or the routing of the lines like 4 Jaw Chuck suggests. Do I need a line from one valve cover to the air cleaner to supply air, and the PCV valve in the other valve cover coming from the vacuum port at the bottom of the carb? Also how does the evacuator system set up? Thanks for bringing an old hot rodder kicking and screaming into the environmentally correct age!!!!
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Old 06-13-2002, 06:21 AM
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An evacuator system connects the crankcase to your exhaust system and dumps the sewage into your exhaust pipe. Very elegant and efficient at speed but does not work at idle or extremely low speeds. I have not had good luck with them in the city (they tend to pressurize the crankcase and blow endseals out), perhaps Tom has some more info and has had better luck.
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