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Old 09-28-2008, 09:19 AM
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pcv valve collapsing

hi guys-
long time lurker here.
i have a 390 with an edelbrock 1406 carb and blah blah blah.
well anyways i noticed that the pcv valve hose is semi flat when the engine is running, and when i throw a rev that sucker is FLAT!
now i was thinking, should that hose actually be a tube or maybe like an old school radiator hose, have a spring in it to keep it from collapsing?
i ck'd the suction of the hose with the engine running and it functions ok, i rattled it and it clack ck's ok.
i did a search but i didn't quite find what i was looking for..
thanks for the help.
Raf

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Old 09-28-2008, 09:25 AM
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Do you hav a crankcase vent in the opposite side valve cover?
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Old 09-28-2008, 09:26 AM
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um, theres a valve cover breather.....?
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Old 09-28-2008, 09:29 AM
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Quote:
Originally Posted by $arge
um, theres a valve cover breather.....?
Same thing. It just need to be able to pull fresh air in from somewhere or it could collapse the hose. Sounds like you have some serious vacuum or a very weak hose.

Last edited by SSedan64; 09-28-2008 at 09:31 AM. Reason: spelling
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Old 09-28-2008, 09:30 AM
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Quote:
Originally Posted by $arge
hi guys-
long time lurker here.
i have a 390 with an edelbrock 1406 carb and blah blah blah.
well anyways i noticed that the pcv valve hose is semi flat when the engine is running, and when i throw a rev that sucker is FLAT!
now i was thinking, should that hose actually be a tube or maybe like an old school radiator hose, have a spring in it to keep it from collapsing?
i ck'd the suction of the hose with the engine running and it functions ok, i rattled it and it clack ck's ok.
i did a search but i didn't quite find what i was looking for..
thanks for the help.
Raf
After time the oil will soften the hose and make it susceptible to collapse. I would try changing the hose and make sure you get the proper type.

Chet
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Old 09-28-2008, 09:31 AM
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so get a stronger hose...i'll give that a whirl

or tell the engine to stop sucking so much
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Old 09-28-2008, 09:44 AM
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I built a pvc tube out of 3/8 steel and connected it to the carb and pvc valve with rubber on my 78 F250. I just took a coat hanger and used it as a template. I bought a 3/8 steel tube from Carquest and a short piece of rubber hose a few bucks an made my own. 10,000 miles later no problems.


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Old 09-28-2008, 02:35 PM
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whatd'ya know....
it ended up being the P.O. used heater hose to link the PCV and the intake port. swapped out the hose with pwr steering hose and what do you know, ck good!
thanks doods.

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