Beagle 1
Well-known member
I'm looking at the pcv hose on my 69 427/390 mostly stock engine and I notice that the hose looks like a cold ac hose with condensation on it. Turns out that it is oil. Not just a smooth coating, but little bits all over it.
The hose is a 3/8" high pressure fuel line that has about a 3/16" wall. I found that with the high underhood temps that the standard vacume hose would colasp, so I switched to a more robust hose about 5K miles ago. Seems to work fine, just a little large.
I get about 18" of vac at idle and the pcv valve is working.
I doubt that the oil is coming through the hose, especially since it is a vacume hose, but where would it come from? Do you think it could ooze out from the hose when the engine cools?
I guess the easiest thing is to try another hose.
Also, a few questiions on the pcv system.
There is definately a restriction through the valve. Is this normal? Is there such a thing as a high flow valve? And would this be advantages, or is the flow suposed to be restrictive? There isn't any noticeable blowby or oil fumes when I pull the valve out of the stock valve covers.
The hose is a 3/8" high pressure fuel line that has about a 3/16" wall. I found that with the high underhood temps that the standard vacume hose would colasp, so I switched to a more robust hose about 5K miles ago. Seems to work fine, just a little large.
I get about 18" of vac at idle and the pcv valve is working.
I doubt that the oil is coming through the hose, especially since it is a vacume hose, but where would it come from? Do you think it could ooze out from the hose when the engine cools?
I guess the easiest thing is to try another hose.
Also, a few questiions on the pcv system.
There is definately a restriction through the valve. Is this normal? Is there such a thing as a high flow valve? And would this be advantages, or is the flow suposed to be restrictive? There isn't any noticeable blowby or oil fumes when I pull the valve out of the stock valve covers.