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By Reaper5054 - 10 Years Ago
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Hey all, i recently converted My 292 to have the PCV valve ..but now im getting the fumes pushing back through he oil filler tube.
I have a filtered oil cap that allows air in and out.
And the Pcv is an inline one from the back of the valley pan to the port just in front of the 2 barrel carby on the intake manifold.
Any ideas why this is happening ???
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By Barry L - 10 Years Ago
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Hi If this is a new set-up, check the flow direction of the PVC valve..... with the engine running, pull the pvc valve out and check that there is suction (vacuum) at the valve. Also look for kinks in any rubber hose that could "suck" shut when the engine is running. Barry L
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By pegleg - 10 Years Ago
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Dan, you'll always have some condensation, but like they said, run it for a while now and then. Remember hot air will absorb and hold more moisture than cold air. If you circulate the hotter air with a PCV setup it will remove most of the condensation.
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By miker - 10 Years Ago
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Kind of depends when it's smoking out the fill cap. Barry's points are correct if it's smoking at idle. Some on here have had to restrict the PCV valve to avoid lean idle, sounds like you're too restricted. But if it's showing a little fumes with the engine off, you've got no air flow, and the hot air rising in the motor will flow out the fill cap. That's why I like closed systems, where the fill cap has a solid bottom, a tube, and a hose running to the aircleaner.
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By Reaper5054 - 10 Years Ago
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Ok ive checked the air vacuum at idle and no kinks etc ..seems to all be working fine..but i can still see the the fumes through the oil cap.
would changing it to a closed system be a better idea or maybe using a carby spacer plate with vacuum port ???
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By miker - 10 Years Ago
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I don't know about the spacer, but changing to a closed system won't help till it's working at idle.
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By Steve - 10 Years Ago
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You can try experimenting with different valves. Some flow more than others.
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